Regional Migration Forecast: 15-22 September 2017

Long-tailed Jaeger. Brendan Click/Macaulay Library. eBird S39027125.

Continental Summary

Pulses of favorable migration conditions this week in the West will bring moderate flights featuring Turkey Vulture, Pectoral Sandpiper, Parasitic Jaeger, Common Tern, Mountain Bluebird, Summer Tanager, and Orange-crowned Warbler, while the East experiences scattered moderate to heavy flights featuring Eastern Wood-Pewee, Yellow-bellied Flycatcher, Red-eyed Vireo, Blue-headed Vireo, Swainson’s Thrush, Magnolia Warbler, and Common Yellowthroat when conditions allow. Another tropical system off the Atlantic coast brings potential for interesting observations, as does a tropical system moving across the Gulf of California and into the southern Rockies and western Texas.

Arrows show wind speed and direction (arrow points in the direction to which wind is blowing) 100 m above ground level. Areas with southerly winds are colored red; northerly winds colored blue. Accumulated precipitation (in 6 hour intervals) is green, outlined by white. Broadly speaking, areas of the map in blue will experience conditions that are favorable for migration, and areas where blue and green (and red and blue) intersect and overlap may experience migrant concentrations and fallouts as migrants interact with precipitation.

We use data collected by eBird users help make more accurate forecasts. If you enjoy the predictions contained in these posts, please consider submitting your own bird sightings to eBird to even further improve the content. Every observation counts, whether it be a single bird at a feeder in your backyard, or an entire day spent in a national park. To get started with eBird, head on over to the site!

Please note that photographs and other digital media showing birds come from the Macaulay Library, which receives credit along with the photographer/observer in the media caption as part of a new initiative that allows public contribution, access and use of natural history media.

Need a review of our definitions for regions, species on the move, and migration amounts? Please visit this link.

Quick Links to Regions

Upper Midwest and NortheastBirdCast Upper Midwest and Northeast Region Gulf Coast and SoutheastBirdCast Upper Southeast Region
Great Plainsbirdcast_plains West
BirdCast West Region

Upper Midwest and Northeast

Complex will be one word to describe the forecast period. Moderate and heavy flights will occur in several areas of the region over the weekend, but the extent of these flights will be limited by the presence of significantly more widely distributed unfavorable and marginal than favorable migration conditions. This pattern persists into the work week, accentuated by the approach of Hurricane Jose off the mid Atlantic coast by Tuesday and Wednesday. As this system approaches and passes, some areas may see significantly more intense flights, in particular in southern New York and New England. However, even the passage of this storm does not clear the decks for a major change in the migration scene, with marginal and unfavorable migration conditions persisting through the week in most of the region. Note that the track of Jose may chance, making for a very different forecast for migration and for storm-displaced birds, so stay tuned to Birdcast for updates as we have them.

Magnolia Warbler. Brendan Click/Macaulay Library. eBird S39120325.

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Northern Harrier ** 8/2 10/9 10/21 11/2 11/13
Peregrine Falcon * 8/2 9/23 10/4 10/17 10/28
Northern Shoveler ** 8/9 10/12 11/8 After Nov 30 -
Green-winged Teal ** 8/13 10/11 10/24 After Nov 30 -
Palm Warbler *** 9/2 9/21 10/6 10/21 11/1
Pied-billed Grebe *** 9/4 10/11 10/31 11/20 After Nov 30
Northern Pintail ** 9/5 10/12 10/27 11/7 After Nov 30
Great Cormorant * 9/5 11/16 After Nov 30 - -
Marsh Wren * 9/7 9/19 9/30 10/17 10/29
Blue-headed Vireo *** 9/8 9/21 10/4 10/19 10/31
Eastern Phoebe ****! 9/9 9/18 9/30 10/18 11/3
Lincoln's Sparrow *** 9/10 9/22 10/5 10/19 10/31
Indigo Bunting *** 9/10 9/16 9/25 10/12 10/21
American Pipit *** 9/10 9/22 10/24 11/11 11/25
Eastern Bluebird *** 9/12 9/27 10/18 11/12 After Nov 30
Savannah Sparrow *** 9/12 9/26 10/12 10/29 11/12
Dunlin ** 9/13 10/17 10/29 11/11 11/22
American Robin *** 9/13 9/24 10/13 11/8 After Nov 30
Yellow-bellied Sapsucker *** 9/16 9/25 10/5 10/16 10/24
Chipping Sparrow *** 9/16 10/2 10/12 10/29 11/9
Winter Wren *** 9/17 9/28 10/15 10/28 11/8
Eastern Meadowlark ** 9/17 10/2 10/16 10/30 11/11
Ruby-crowned Kinglet ****! 9/18 9/30 10/14 10/28 11/8
White-throated Sparrow ****! 9/18 9/30 10/18 10/31 11/12
Brown Creeper *** 9/19 9/29 10/14 10/24 11/5
Yellow-rumped Warbler ****! 9/19 9/29 10/12 10/26 11/7
Song Sparrow ****! 9/19 10/1 10/14 10/28 11/10
Rusty Blackbird *** 9/19 10/3 10/23 11/10 After Nov 30
Swamp Sparrow ****! 9/20 9/30 10/13 10/27 11/10
Golden-crowned Kinglet ****! 9/22 10/1 10/15 11/6 11/18
American Wigeon ** 9/23 10/8 10/28 11/10 11/29
American Black Duck *** 9/23 10/14 After Nov 30 - -
Horned Lark * 9/23 9/29 10/10 10/15 10/17
Eastern Towhee *** 9/23 9/30 10/9 10/23 11/3
White-crowned Sparrow ****! 9/23 10/2 10/15 10/27 11/6

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Belted Kingfisher ** - 8/2 9/19 10/16 10/29
Sora * 8/12 8/21 9/24 10/12 10/25
Magnolia Warbler *** 8/20 9/1 9/16 10/2 10/13
Common Yellowthroat *** 8/24 9/2 9/17 10/9 10/23
Black-throated Blue Warbler *** 8/23 9/2 9/25 10/14 10/23
Nashville Warbler *** 8/23 9/3 9/20 10/10 10/22
Merlin *** 8/26 9/4 9/20 10/26 11/6
Red-breasted Nuthatch ** 8/12 9/4 10/2 10/17 After Nov 30
Cape May Warbler *** 8/25 9/4 9/18 10/2 10/15
Pine Warbler ** 8/23 9/4 9/21 10/12 10/26
Bald Eagle *** 8/2 9/5 9/17 9/26 10/1
Red-shouldered Hawk ** 8/26 9/5 9/21 11/10 11/19
Philadelphia Vireo *** 8/27 9/5 9/16 9/28 10/7
Swainson's Thrush *** 8/27 9/5 9/17 9/30 10/14
Turkey Vulture *** 8/28 9/6 9/19 10/27 After Nov 30
American Kestrel ** 8/29 9/6 9/26 10/22 11/2
Cooper's Hawk ** 8/2 9/7 10/11 10/28 11/8
Northern Parula *** 8/28 9/7 9/20 10/4 10/15
Blackpoll Warbler *** 8/28 9/7 9/22 10/8 10/23
Black-throated Green Warbler *** 8/24 9/7 9/21 10/6 10/17
Summer Tanager * 8/27 9/7 9/17 10/2 10/12
Rose-breasted Grosbeak *** 8/30 9/7 9/17 9/30 10/9
Broad-winged Hawk *** 8/31 9/8 9/18 9/29 10/7
Blue Jay *** 8/23 9/8 9/28 10/30 11/26
Gray Catbird *** 8/28 9/8 9/18 10/9 10/22
Brown Thrasher *** 8/30 9/9 9/21 10/4 10/17
Sharp-shinned Hawk *** 8/31 9/10 10/17 10/30 After Nov 30
Gray-cheeked Thrush ** 9/2 9/11 9/23 10/5 10/14
Northern Flicker *** 8/30 9/12 9/25 10/10 10/30
Indigo Bunting ** 9/10 9/16 9/25 10/12 10/21
Eastern Phoebe *** 9/9 9/18 9/30 10/18 11/3
Marsh Wren * 9/7 9/19 9/30 10/17 10/29
Blue-headed Vireo *** 9/8 9/21 10/4 10/19 10/31
Palm Warbler *** 9/2 9/21 10/6 10/21 11/1
Lincoln's Sparrow *** 9/10 9/22 10/5 10/19 10/31
American Pipit ** 9/10 9/22 10/24 11/11 11/25
Peregrine Falcon ** 8/2 9/23 10/4 10/17 10/28

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Killdeer *** - - Before Aug 1 10/25 11/24
Whimbrel * - - Before Aug 1 9/19 10/3
Yellow-crowned Night-Heron * - 8/2 8/6 10/10 10/28
Yellow-billed Cuckoo * - 8/2 8/6 9/28 10/12
Tree Swallow *** - 8/2 8/9 10/25 11/6
Snowy Egret ** - 8/2 8/11 10/17 10/31
Green Heron *** - 8/2 8/12 9/16 10/5
Great Egret *** - 8/2 8/13 10/22 11/5
Laughing Gull ** - 8/2 8/14 After Nov 30 -
Great Blue Heron *** - 8/2 8/15 10/20 After Nov 30
Osprey *** - 8/2 8/15 10/19 11/4
Forster's Tern * - 8/2 8/16 9/26 After Nov 30
Cedar Waxwing *** - 8/2 8/17 9/25 After Nov 30
Chimney Swift *** 8/9 8/14 8/18 10/11 10/20
Greater Yellowlegs ** - 8/2 8/20 11/11 After Nov 30
Wood Duck ** - 8/2 8/21 11/2 11/22
Royal Tern * - 8/2 8/21 11/8 After Nov 30
Eastern Wood-Pewee *** 8/7 8/18 8/29 9/24 10/9
Ruby-throated Hummingbird *** - 8/2 8/31 9/21 10/3
Sanderling ** - 8/2 9/2 9/22 10/4
Bobolink ** 8/2 8/19 9/2 9/16 10/19
Least Flycatcher ** 8/11 8/21 9/3 9/21 10/4
Warbling Vireo *** 8/19 8/27 9/5 9/17 9/25
Yellow-bellied Flycatcher * 8/13 8/24 9/6 9/20 9/30
Blue-winged Teal ** 8/2 8/19 9/7 10/22 11/5
Red-eyed Vireo *** 8/15 8/24 9/7 9/28 10/11
Veery *** 8/19 8/28 9/7 9/19 9/28
Golden-winged Warbler * 8/18 8/28 9/8 9/20 9/29
Blackburnian Warbler *** 8/12 8/23 9/8 9/26 10/7
American Golden-Plover * 8/16 8/26 9/9 9/22 10/16
Yellow-throated Vireo *** 8/21 8/29 9/9 9/22 10/2
Chestnut-sided Warbler *** 8/14 8/26 9/9 9/25 10/6
White-eyed Vireo *** 8/23 8/31 9/10 9/23 10/3
Northern Waterthrush *** 8/2 8/31 9/10 9/24 10/9
Hooded Warbler * 8/23 8/31 9/10 9/24 10/5
Prairie Warbler * - 8/2 9/10 9/25 10/7
Red-headed Woodpecker * 8/23 9/1 9/11 9/27 10/13
Wilson's Warbler *** 8/22 8/31 9/11 9/23 10/2
Wood Thrush ** 8/22 8/28 9/12 10/1 10/12
Ovenbird *** 8/15 8/29 9/12 9/30 10/12
American Redstart *** 8/20 8/31 9/12 9/26 10/8
Black-and-white Warbler *** 8/2 8/29 9/13 9/30 10/11
House Wren *** 8/30 9/5 9/15 10/7 10/21
Tennessee Warbler *** 8/17 8/29 9/15 10/4 10/19
Bay-breasted Warbler *** 8/26 9/4 9/15 9/28 10/8
Scarlet Tanager *** 8/24 9/3 9/15 10/1 10/12
Philadelphia Vireo *** 8/27 9/5 9/16 9/28 10/7
Magnolia Warbler *** 8/20 9/1 9/16 10/2 10/13
Bald Eagle ** 8/2 9/5 9/17 9/26 10/1
Swainson's Thrush *** 8/27 9/5 9/17 9/30 10/14
Common Yellowthroat *** 8/24 9/2 9/17 10/9 10/23
Summer Tanager * 8/27 9/7 9/17 10/2 10/12
Rose-breasted Grosbeak *** 8/30 9/7 9/17 9/30 10/9
Broad-winged Hawk *** 8/31 9/8 9/18 9/29 10/7
Gray Catbird *** 8/28 9/8 9/18 10/9 10/22
Cape May Warbler *** 8/25 9/4 9/18 10/2 10/15
Turkey Vulture *** 8/28 9/6 9/19 10/27 After Nov 30
Belted Kingfisher *** - 8/2 9/19 10/16 10/29
Merlin * 8/26 9/4 9/20 10/26 11/6
Nashville Warbler *** 8/23 9/3 9/20 10/10 10/22
Northern Parula *** 8/28 9/7 9/20 10/4 10/15
Red-shouldered Hawk * 8/26 9/5 9/21 11/10 11/19
Brown Thrasher *** 8/30 9/9 9/21 10/4 10/17
Pine Warbler ** 8/23 9/4 9/21 10/12 10/26
Black-throated Green Warbler *** 8/24 9/7 9/21 10/6 10/17
Blackpoll Warbler *** 8/28 9/7 9/22 10/8 10/23
Gray-cheeked Thrush ** 9/2 9/11 9/23 10/5 10/14

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Black Skimmer * - - Before Aug 1 8/3 10/28
Yellow Warbler *** - - Before Aug 1 8/10 9/24
Glossy Ibis * - - Before Aug 1 8/23 9/24
American Oystercatcher * - 8/2 8/4 8/23 9/26
Common Tern *** - - Before Aug 1 8/24 9/30
Little Blue Heron * - 8/2 8/9 8/25 10/24
Black-crowned Night-Heron * - 8/2 8/9 8/25 10/27
Northern Rough-winged Swallow ** - - Before Aug 1 8/25 10/25
Black-bellied Plover * - 8/2 8/18 8/27 After Nov 30
Cliff Swallow ** - - Before Aug 1 8/29 9/17
Blue Grosbeak * - - Before Aug 1 8/31 10/17
Ruddy Turnstone ** - 8/2 8/10 9/2 9/25
Spotted Sandpiper *** - - Before Aug 1 9/3 9/18
Lesser Yellowlegs *** - 8/2 8/19 9/5 9/24
Semipalmated Sandpiper *** 8/2 8/7 8/20 9/6 9/20
Pectoral Sandpiper ** 8/11 8/17 8/23 9/7 11/13
Black Tern ** 8/7 8/16 8/25 9/7 9/18
Stilt Sandpiper ** 8/12 8/18 8/26 9/8 9/18
Least Sandpiper *** - 8/2 8/19 9/8 9/22
Western Sandpiper * 8/13 8/19 8/28 9/9 9/20
Red Knot * 8/11 8/19 8/28 9/10 9/22
Baird's Sandpiper *** 8/12 8/20 8/30 9/10 9/19
Semipalmated Plover *** - 8/2 8/18 9/11 9/28
Solitary Sandpiper *** - 8/2 8/13 9/11 9/30
Canada Warbler *** 8/2 8/18 8/29 9/11 9/24
Caspian Tern ** - 8/2 8/20 9/12 10/22
Olive-sided Flycatcher * 8/2 8/18 8/30 9/12 9/25
Buff-breasted Sandpiper ** 8/16 8/23 9/3 9/14 9/22
Great Crested Flycatcher *** 8/15 8/21 8/27 9/14 9/24
White-rumped Sandpiper ** - 8/2 8/27 9/15 9/22
Blue-gray Gnatcatcher *** 8/2 8/12 8/26 9/15 9/27
Blue-winged Warbler ** - 8/2 8/28 9/15 9/26
Green Heron *** - 8/2 8/12 9/16 10/5
Bobolink ** 8/2 8/19 9/2 9/16 10/19
Warbling Vireo *** 8/19 8/27 9/5 9/17 9/25
Whimbrel * - - Before Aug 1 9/19 10/3
Veery *** 8/19 8/28 9/7 9/19 9/28
Yellow-bellied Flycatcher ** 8/13 8/24 9/6 9/20 9/30
Golden-winged Warbler ** 8/18 8/28 9/8 9/20 9/29
Ruby-throated Hummingbird *** - 8/2 8/31 9/21 10/3
Least Flycatcher *** 8/11 8/21 9/3 9/21 10/4
American Golden-Plover * 8/16 8/26 9/9 9/22 10/16
Sanderling ** - 8/2 9/2 9/22 10/4
Yellow-throated Vireo *** 8/21 8/29 9/9 9/22 10/2
White-eyed Vireo *** 8/23 8/31 9/10 9/23 10/3
Wilson's Warbler *** 8/22 8/31 9/11 9/23 10/2

Gulf Coast and Southeast

Moderate to locally very heavy flights will be the form for the first half of the period to the east of the Mississippi River, while to the west locally moderate flights will be the norm. Hurricane Jose keeps the coastal plains and Appalachians in primarily light northerly and northeasterly winds, allowing for the intensity of these movements. By Tuesday more marginal conditions build into even these areas, and locally light to moderate flights become the norm for the remainder of the period. One exception will be in the Carolinas, Georgia and Florida to end the period, when more favorable conditions are forecast to return; moderate to locally very heavy flights will attend these conditions.

Blue-gray Gnatcatcher. Bob Friedrichs/Macaulay Library. eBird S39173295.

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Great Blue Heron *** 8/2 11/5 11/16 After Nov 30 -
Cooper's Hawk ** 8/2 9/21 10/17 After Nov 30 -
American Avocet * 8/2 10/22 11/7 After Nov 30 -
Belted Kingfisher *** 8/13 9/18 10/22 After Nov 30 -
Black Vulture ** 8/28 9/30 11/18 After Nov 30 -
Sora * 8/29 9/21 11/7 11/17 After Nov 30
Common Yellowthroat *** 9/1 9/17 10/6 10/21 11/2
Brown Thrasher *** 9/2 9/22 10/6 10/21 11/3
Clay-colored Sparrow * 9/2 9/16 10/4 10/21 11/6
Blue-headed Vireo ** 9/3 10/15 10/31 11/8 11/14
Northern Mockingbird ****! 9/7 9/23 10/10 10/26 11/22
Sharp-shinned Hawk *** 9/8 9/24 10/28 11/15 After Nov 30
Merlin *** 9/8 9/18 10/9 11/2 11/16
Scissor-tailed Flycatcher ** 9/8 9/23 10/7 11/3 11/23
Swainson's Thrush *** 9/8 9/17 9/29 10/13 10/23
Wood Thrush ** 9/10 9/21 10/2 10/15 10/25
Eastern Towhee ** 9/10 10/10 10/19 11/1 11/12
American Kestrel *** 9/12 9/29 11/12 After Nov 30 -
Rose-breasted Grosbeak *** 9/12 9/21 10/4 10/16 10/26
American Bittern * 9/14 10/9 11/12 After Nov 30 -
Peregrine Falcon *** 9/15 9/25 10/7 10/18 10/26
Brown-headed Cowbird ** 9/15 9/27 10/23 After Nov 30 -
Palm Warbler ****! 9/15 10/5 10/20 10/31 11/7
Northern Harrier *** 9/16 10/27 11/16 After Nov 30 -
Gray Catbird ****! 9/16 9/27 10/10 10/23 11/6
Northern Flicker ****! 9/18 10/1 10/17 10/29 11/8
Marsh Wren *** 9/20 10/3 11/1 11/18 After Nov 30
Indigo Bunting *** 9/21 9/30 10/11 10/25 11/5
Herring Gull ** 9/22 11/29 After Nov 30 - -
Red-winged Blackbird *** 9/22 10/4 11/9 After Nov 30 -
House Wren *** 9/23 10/6 10/28 11/12 After Nov 30
Lincoln's Sparrow *** 9/23 10/4 10/31 11/13 11/21

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Swainson's Hawk * - 8/2 10/2 10/16 10/28
Black-bellied Plover * - 8/2 10/31 After Nov 30 -
Caspian Tern * - 8/2 11/7 After Nov 30 -
Hooded Warbler ** 8/8 8/20 9/20 10/5 10/29
Worm-eating Warbler ** 8/11 8/23 9/16 10/1 10/10
Blue-winged Teal * 8/8 8/26 11/8 11/29 After Nov 30
Eastern Wood-Pewee *** 8/19 9/1 9/17 10/17 11/2
Pine Warbler *** 8/15 9/1 10/9 10/26 11/3
White-eyed Vireo *** 8/21 9/2 9/19 10/13 10/28
Northern Parula *** 8/11 9/2 9/19 10/24 11/4
Bobolink * 8/21 9/2 9/20 10/13 10/26
Red-eyed Vireo *** 8/20 9/3 9/17 10/8 10/24
Yellow-throated Warbler ** 8/2 9/3 9/25 10/20 11/4
Red-headed Woodpecker * 8/22 9/4 9/18 10/26 11/5
Yellow-bellied Flycatcher * 8/2 9/4 9/16 10/1 10/11
Wilson's Warbler *** 8/27 9/4 9/17 9/29 10/16
Chimney Swift *** 8/23 9/5 9/21 10/11 10/22
Black-and-white Warbler *** 8/22 9/5 9/22 10/25 11/5
Blackburnian Warbler ** 8/26 9/5 9/18 10/3 10/28
Warbling Vireo * 8/28 9/6 9/17 9/29 10/8
Cedar Waxwing * 8/28 9/6 9/18 9/29 10/7
Chestnut-sided Warbler *** 8/23 9/6 9/22 10/9 10/23
Black-throated Green Warbler ** 8/28 9/6 10/10 10/25 11/6
Northern Waterthrush *** 8/15 9/7 9/20 10/3 10/13
Prairie Warbler ** 8/2 9/7 9/22 10/14 11/3
Veery *** 8/31 9/8 9/20 10/1 10/10
Ovenbird *** 8/26 9/11 9/25 10/25 11/5
Tennessee Warbler *** 8/31 9/11 10/3 10/23 11/3
Nashville Warbler *** 8/30 9/11 10/4 10/24 11/12
Black-throated Blue Warbler ** 8/31 9/11 10/11 10/27 11/5
American Redstart *** 8/31 9/12 9/26 10/19 11/2
Scarlet Tanager *** 8/30 9/12 9/28 10/14 10/25
Cape May Warbler ** 9/3 9/12 9/25 10/28 11/5
Magnolia Warbler *** 8/31 9/13 10/1 10/19 10/31
Bald Eagle ** 9/3 9/15 11/21 After Nov 30 -
Broad-winged Hawk ** 9/6 9/15 9/25 10/6 10/16
Clay-colored Sparrow * 9/2 9/16 10/4 10/21 11/6
Swainson's Thrush *** 9/8 9/17 9/29 10/13 10/23
Common Yellowthroat *** 9/1 9/17 10/6 10/21 11/2
Belted Kingfisher *** 8/13 9/18 10/22 After Nov 30 -
Merlin ** 9/8 9/18 10/9 11/2 11/16
Cooper's Hawk ** 8/2 9/21 10/17 After Nov 30 -
Sora * 8/29 9/21 11/7 11/17 After Nov 30
Wood Thrush ** 9/10 9/21 10/2 10/15 10/25
Rose-breasted Grosbeak *** 9/12 9/21 10/4 10/16 10/26
Brown Thrasher *** 9/2 9/22 10/6 10/21 11/3
Scissor-tailed Flycatcher * 9/8 9/23 10/7 11/3 11/23
Northern Mockingbird *** 9/7 9/23 10/10 10/26 11/22

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Cattle Egret ** - - Before Aug 1 10/3 10/18
Green Heron *** - - Before Aug 1 9/18 10/8
Yellow-crowned Night-Heron * - - Before Aug 1 10/8 10/23
Black-chinned Hummingbird * - - Before Aug 1 9/21 10/10
Eastern Kingbird *** - - Before Aug 1 9/22 10/5
Gray Kingbird * - - Before Aug 1 9/17 10/11
Stilt Sandpiper * - 8/2 8/14 9/17 9/27
Pectoral Sandpiper * - 8/2 8/16 9/19 9/30
Common Tern * - 8/2 8/18 9/30 11/10
Semipalmated Plover ** - 8/2 8/20 9/17 9/27
Piping Plover * - 8/2 8/20 After Nov 30 -
Prothonotary Warbler * 8/2 8/15 8/29 9/24 10/6
Baird's Sandpiper * 8/2 8/19 8/30 9/17 9/28
Great Crested Flycatcher *** 8/15 8/23 9/2 9/19 10/1
Common Nighthawk *** 8/21 8/27 9/3 9/16 9/24
Buff-breasted Sandpiper ** 8/18 8/27 9/4 9/17 9/25
Cave Swallow * 8/2 8/28 9/4 9/16 11/21
Kentucky Warbler * 8/2 8/13 9/4 9/25 10/6
Dickcissel * 8/21 8/29 9/5 9/20 10/25
Olive-sided Flycatcher * - 8/2 9/6 9/24 10/4
Yellow-breasted Chat ** 8/17 8/25 9/7 9/23 10/7
Yellow Warbler *** - 8/2 9/8 9/30 10/13
Canada Warbler ** 8/17 8/27 9/8 9/22 10/4
Mourning Warbler ** 8/21 8/30 9/11 9/22 10/2
Least Flycatcher ** 8/2 9/2 9/12 9/24 10/5
Blue-gray Gnatcatcher *** 8/2 8/29 9/12 9/26 10/15
Baltimore Oriole *** 8/26 9/2 9/12 9/23 10/1
Ruby-throated Hummingbird *** 8/13 8/29 9/13 10/4 10/19
Acadian Flycatcher ** 8/21 9/1 9/15 10/2 10/16
Yellow-throated Vireo *** 8/17 8/31 9/15 9/30 10/13
Blue-winged Warbler ** 8/21 9/2 9/15 9/29 10/10
Summer Tanager *** 8/21 9/1 9/15 10/1 10/18
Yellow-bellied Flycatcher * 8/2 9/4 9/16 10/1 10/11
Worm-eating Warbler ** 8/11 8/23 9/16 10/1 10/10
Eastern Wood-Pewee *** 8/19 9/1 9/17 10/17 11/2
Warbling Vireo * 8/28 9/6 9/17 9/29 10/8
Red-eyed Vireo *** 8/20 9/3 9/17 10/8 10/24
Wilson's Warbler *** 8/27 9/4 9/17 9/29 10/16
Red-headed Woodpecker ** 8/22 9/4 9/18 10/26 11/5
Cedar Waxwing * 8/28 9/6 9/18 9/29 10/7
Blackburnian Warbler ** 8/26 9/5 9/18 10/3 10/28
White-eyed Vireo *** 8/21 9/2 9/19 10/13 10/28
Northern Parula *** 8/11 9/2 9/19 10/24 11/4
Veery *** 8/31 9/8 9/20 10/1 10/10
Northern Waterthrush *** 8/15 9/7 9/20 10/3 10/13
Hooded Warbler *** 8/8 8/20 9/20 10/5 10/29
Bobolink * 8/21 9/2 9/20 10/13 10/26
Chimney Swift *** 8/23 9/5 9/21 10/11 10/22
Black-and-white Warbler *** 8/22 9/5 9/22 10/25 11/5
Chestnut-sided Warbler *** 8/23 9/6 9/22 10/9 10/23
Prairie Warbler *** 8/2 9/7 9/22 10/14 11/3

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Blue Grosbeak ** - - Before Aug 1 8/24 10/28
Sandwich Tern * - 8/2 8/16 8/27 After Nov 30
Wilson's Plover * - 8/2 8/14 9/3 9/23
Sanderling * - 8/2 8/19 9/3 9/16
Least Tern *** - - Before Aug 1 9/3 9/17
Short-billed Dowitcher * - 8/2 8/22 9/6 9/21
Louisiana Waterthrush * - 8/2 8/13 9/6 9/30
Barn Swallow *** - 8/2 8/10 9/9 11/14
Spotted Sandpiper *** - 8/2 8/18 9/10 9/22
Black Tern *** 8/2 8/6 8/24 9/10 9/26
Solitary Sandpiper ** 8/13 8/16 8/20 9/11 9/23
Upland Sandpiper ** - 8/2 8/19 9/11 9/24
Bank Swallow ** 8/14 8/21 8/31 9/12 9/22
Semipalmated Sandpiper *** 8/2 8/13 8/26 9/14 9/28
Wilson's Phalarope * - 8/2 8/23 9/14 10/2
Cliff Swallow ** - - Before Aug 1 9/14 10/18
Orchard Oriole ** - - Before Aug 1 9/14 9/30
Least Sandpiper * - 8/2 8/25 9/15 After Nov 30
Western Sandpiper * 8/2 8/17 8/31 9/15 After Nov 30
Common Nighthawk *** 8/21 8/27 9/3 9/16 9/24
Cave Swallow * 8/2 8/28 9/4 9/16 11/21
Semipalmated Plover ** - 8/2 8/20 9/17 9/27
Stilt Sandpiper * - 8/2 8/14 9/17 9/27
Baird's Sandpiper * 8/2 8/19 8/30 9/17 9/28
Buff-breasted Sandpiper ** 8/18 8/27 9/4 9/17 9/25
Gray Kingbird * - - Before Aug 1 9/17 10/11
Green Heron *** - - Before Aug 1 9/18 10/8
Pectoral Sandpiper ** - 8/2 8/16 9/19 9/30
Great Crested Flycatcher *** 8/15 8/23 9/2 9/19 10/1
Dickcissel * 8/21 8/29 9/5 9/20 10/25
Black-chinned Hummingbird ** - - Before Aug 1 9/21 10/10
Eastern Kingbird *** - - Before Aug 1 9/22 10/5
Mourning Warbler ** 8/21 8/30 9/11 9/22 10/2
Canada Warbler ** 8/17 8/27 9/8 9/22 10/4
Yellow-breasted Chat ** 8/17 8/25 9/7 9/23 10/7
Baltimore Oriole *** 8/26 9/2 9/12 9/23 10/1

Great Plains

Unfavorable migration conditions are in place for much of the region to begin the weekend, but by Sunday a frontal passage brings a wave of cooler air following precipitation. Moderate to locally heavy flights are likely. For the remainder of the period, two additional frontal passages are forecast; however, neither of these is forecast to be extensive or strong, making migration following their passage likely to be intense but local. Additionally, birders should watch these frontal passages closely, as precipitation and nocturnal migrants will likely overlap in each of them, making local fallout and concentrations a possibility. This will be particularly true in the northern and central Plains.

Rose-breasted Grosbeak. Dale Heinert/Macaulay Library. eBird S39019361.

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Wilson's Snipe * 8/2 10/3 10/18 11/3 11/16
Purple Finch * 8/2 10/27 After Nov 30 - -
American Golden-Plover * 8/12 9/22 9/30 10/12 11/16
Sharp-shinned Hawk *** 8/31 10/2 10/17 10/28 After Nov 30
Pied-billed Grebe *** 9/3 9/16 10/30 11/13 11/29
Franklin's Gull *** 9/3 9/16 10/16 11/7 After Nov 30
Red-tailed Hawk *** 9/5 9/27 10/27 11/9 After Nov 30
Orange-crowned Warbler ****! 9/5 9/21 10/4 10/17 10/28
Western Grebe * 9/6 10/17 10/31 After Nov 30 -
Scissor-tailed Flycatcher *** 9/6 9/16 9/27 10/19 11/1
Lincoln's Sparrow *** 9/6 9/21 10/11 10/29 11/10
Northern Flicker ****! 9/7 9/16 10/1 11/4 11/13
Ruby-crowned Kinglet *** 9/7 9/21 10/8 10/24 11/8
Vesper Sparrow *** 9/7 9/23 10/10 10/27 11/6
Spotted Towhee *** 9/9 9/23 10/9 10/25 11/6
Double-crested Cormorant *** 9/10 9/26 10/23 After Nov 30 -
Northern Harrier *** 9/12 10/11 10/28 11/12 After Nov 30
Yellow-bellied Sapsucker ** 9/12 9/27 After Nov 30 - -
Red-winged Blackbird *** 9/12 9/26 10/22 After Nov 30 -
Savannah Sparrow *** 9/13 10/3 10/15 10/29 11/8
Common Grackle *** 9/13 9/20 10/6 10/29 After Nov 30
Marsh Wren *** 9/14 9/27 10/9 10/23 11/5
Yellow-rumped Warbler ****! 9/15 9/26 10/11 10/24 11/15
White-throated Sparrow *** 9/16 9/28 10/15 11/6 11/17
American Pipit *** 9/17 10/6 10/24 11/12 After Nov 30
Brown Creeper ** 9/18 10/5 After Nov 30 - -
Sedge Wren *** 9/19 9/28 10/9 10/21 10/31
Sprague's Pipit * 9/19 9/29 10/11 10/25 11/6
Chipping Sparrow * 9/20 9/24 10/1 11/1 11/13
Field Sparrow *** 9/20 10/4 10/18 11/4 11/15
Swamp Sparrow *** 9/21 10/2 10/16 11/2 11/14
Eastern Meadowlark *** 9/21 10/1 10/17 11/7 11/19
American Avocet * 9/23 10/5 10/20 11/12 After Nov 30
Nelson's Sparrow ** 9/23 9/30 10/10 10/21 10/29

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Sora * - 8/2 9/27 10/20 11/4
Greater Yellowlegs * - 8/2 10/27 11/16 After Nov 30
Blue-headed Vireo *** 8/25 9/2 9/16 9/28 10/24
Black-throated Green Warbler * 8/20 9/2 9/22 10/13 10/28
Clay-colored Sparrow *** 8/20 9/3 9/24 10/16 10/30
Turkey Vulture *** 8/2 9/4 9/27 10/16 10/25
Cooper's Hawk ** 8/2 9/5 9/24 10/24 11/8
Nashville Warbler *** 8/27 9/5 9/22 10/14 10/24
Merlin * 8/19 9/6 10/24 11/8 11/24
Common Yellowthroat *** 8/30 9/6 9/20 10/12 10/21
Red-shouldered Hawk * 8/2 9/7 9/29 10/28 11/25
American White Pelican ** 8/2 9/8 10/18 After Nov 30 -
Osprey *** 8/28 9/9 9/23 10/6 11/11
Western Meadowlark *** 8/2 9/9 10/15 10/29 11/7
Summer Tanager ** 9/2 9/10 9/20 10/4 10/14
Indigo Bunting ** 9/7 9/11 9/20 10/12 10/21
Peregrine Falcon * 8/2 9/13 9/24 10/9 10/23
Eastern Phoebe *** 9/1 9/13 9/25 10/12 10/25
Broad-winged Hawk ** 9/8 9/15 9/23 10/5 10/12
Pied-billed Grebe *** 9/3 9/16 10/30 11/13 11/29
Franklin's Gull *** 9/3 9/16 10/16 11/7 After Nov 30
Northern Flicker ****! 9/7 9/16 10/1 11/4 11/13
Scissor-tailed Flycatcher ** 9/6 9/16 9/27 10/19 11/1
Common Grackle *** 9/13 9/20 10/6 10/29 After Nov 30
Ruby-crowned Kinglet *** 9/7 9/21 10/8 10/24 11/8
Orange-crowned Warbler *** 9/5 9/21 10/4 10/17 10/28
Lincoln's Sparrow *** 9/6 9/21 10/11 10/29 11/10
American Golden-Plover * 8/12 9/22 9/30 10/12 11/16
Spotted Towhee ** 9/9 9/23 10/9 10/25 11/6
Vesper Sparrow *** 9/7 9/23 10/10 10/27 11/6

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Cattle Egret * - - Before Aug 1 10/1 11/2
Killdeer *** - - Before Aug 1 11/4 After Nov 30
Northern Rough-winged Swallow ** - - Before Aug 1 10/7 10/23
Yellow-headed Blackbird * - 8/2 8/9 9/27 10/8
Lark Bunting ** - 8/2 8/11 9/17 9/24
Chimney Swift *** - 8/2 8/15 10/11 10/20
Green Heron *** - 8/2 8/17 9/22 10/9
Mourning Dove *** - 8/2 8/17 10/4 10/25
Wood Duck ** - 8/2 8/20 10/28 After Nov 30
Snowy Egret ** - 8/2 8/20 10/5 10/26
Eastern Wood-Pewee *** - 8/2 8/20 9/21 10/5
Black-crowned Night-Heron * - 8/2 8/27 9/27 10/28
Common Nighthawk *** 8/15 8/21 8/29 10/1 10/10
Red-headed Woodpecker *** - 8/2 8/29 9/23 10/13
Yellow Warbler *** - 8/2 8/29 9/18 9/27
Great Crested Flycatcher *** 8/2 8/25 8/30 9/16 9/25
Blue-gray Gnatcatcher *** - 8/2 8/30 9/20 10/1
Ruby-throated Hummingbird *** - 8/2 8/31 9/22 10/5
White-faced Ibis * - 8/2 9/1 10/2 10/30
Red-eyed Vireo *** 8/2 8/20 9/1 9/20 10/2
Rose-breasted Grosbeak ** 8/2 8/12 9/2 9/29 10/12
Olive-sided Flycatcher *** 8/13 8/23 9/3 9/16 9/24
Chestnut-sided Warbler * 8/11 8/21 9/3 9/18 10/1
Least Flycatcher *** 8/2 8/20 9/4 9/20 10/2
Ovenbird ** 8/13 8/22 9/4 9/18 10/5
Black-and-white Warbler *** 8/11 8/23 9/5 9/21 10/2
American Redstart *** 8/10 8/24 9/5 9/19 9/28
Yellow-breasted Chat * 8/19 8/26 9/5 9/20 9/30
Sanderling * 8/2 8/20 9/6 10/7 10/26
Warbling Vireo *** 8/20 8/28 9/6 9/19 9/27
Red-necked Phalarope * 8/2 8/22 9/7 9/29 10/15
Say's Phoebe ** 8/16 8/28 9/7 9/26 10/8
Yellow-throated Vireo ** 8/24 8/31 9/8 9/19 9/27
Tennessee Warbler * 8/2 8/9 9/9 10/3 10/23
Magnolia Warbler * 8/16 8/27 9/9 9/23 10/3
Swainson's Hawk *** - 8/2 9/11 10/14 10/22
Caspian Tern * 8/2 8/31 9/11 9/26 10/9
House Wren *** 8/25 9/1 9/11 10/6 10/20
Swainson's Thrush *** 8/24 9/1 9/11 9/22 10/1
White-eyed Vireo ** 8/24 9/1 9/12 9/27 10/8
Northern Parula ** 8/26 9/2 9/12 9/24 10/5
Blue-winged Teal *** 8/2 8/10 9/13 10/24 11/10
Great Egret *** - 8/2 9/13 10/20 11/11
Philadelphia Vireo ** 8/18 8/31 9/13 9/27 10/6
Gray Catbird *** 8/2 9/4 9/13 10/1 10/13
Brown Thrasher *** 8/26 9/4 9/14 9/29 10/9
Blue-headed Vireo ** 8/25 9/2 9/16 9/28 10/24
Common Yellowthroat *** 8/30 9/6 9/20 10/12 10/21
Summer Tanager *** 9/2 9/10 9/20 10/4 10/14
Indigo Bunting *** 9/7 9/11 9/20 10/12 10/21
Nashville Warbler *** 8/27 9/5 9/22 10/14 10/24
Black-throated Green Warbler * 8/20 9/2 9/22 10/13 10/28
Osprey *** 8/28 9/9 9/23 10/6 11/11
Broad-winged Hawk ** 9/8 9/15 9/23 10/5 10/12

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Orchard Oriole *** - - Before Aug 1 8/15 9/18
Yellow-crowned Night-Heron * - - Before Aug 1 8/17 10/10
Yellow-billed Cuckoo *** - - Before Aug 1 8/17 10/2
Upland Sandpiper *** - - Before Aug 1 8/25 9/17
Willet * - - Before Aug 1 8/26 9/29
Cliff Swallow *** - - Before Aug 1 8/31 9/22
Black-bellied Plover * - 8/2 8/21 9/1 11/21
Pectoral Sandpiper ** - - Before Aug 1 9/2 10/23
Eastern Kingbird *** - 8/2 8/13 9/4 9/21
Bobolink * - - Before Aug 1 9/4 10/2
Mississippi Kite *** 8/9 8/14 8/20 9/7 9/20
Black-necked Stilt ** 8/2 8/15 8/24 9/7 9/18
Little Blue Heron ** 8/2 8/11 8/21 9/8 10/7
Snowy Plover * 8/2 8/9 8/23 9/8 9/19
Stilt Sandpiper *** 8/13 8/19 8/27 9/8 9/16
Northern Waterthrush ** 8/12 8/19 8/29 9/8 9/17
Baltimore Oriole *** 8/7 8/17 8/26 9/8 9/18
Spotted Sandpiper *** - - Before Aug 1 9/9 9/29
Semipalmated Sandpiper *** 8/2 8/13 8/20 9/9 9/23
Bell's Vireo *** 8/14 8/19 8/26 9/9 9/19
Tree Swallow ** - - Before Aug 1 9/9 11/1
Solitary Sandpiper *** 8/2 8/7 8/15 9/10 9/26
Marbled Godwit * - 8/2 8/15 9/10 10/2
Baird's Sandpiper *** - - Before Aug 1 9/10 9/21
Buff-breasted Sandpiper ** 8/16 8/21 8/29 9/10 9/18
Forster's Tern ** - 8/2 8/20 9/10 10/19
Bank Swallow *** - 8/2 8/19 9/10 9/26
Western Wood-Pewee * 8/12 8/18 8/25 9/11 9/23
Wilson's Phalarope *** 8/12 8/17 8/23 9/12 9/25
Black Tern *** - - Before Aug 1 9/12 9/30
Lesser Yellowlegs ** - 8/2 8/20 9/13 11/8
Mourning Warbler * 8/12 8/20 9/1 9/13 9/27
Lark Sparrow *** - - Before Aug 1 9/13 9/26
Least Sandpiper *** 8/2 8/6 8/25 9/14 9/24
Canada Warbler * 8/2 8/16 8/31 9/14 9/25
Semipalmated Plover *** 8/22 8/25 8/29 9/15 9/23
Olive-sided Flycatcher *** 8/13 8/23 9/3 9/16 9/24
Great Crested Flycatcher *** 8/2 8/25 8/30 9/16 9/25
Lark Bunting *** - 8/2 8/11 9/17 9/24
Ovenbird ** 8/13 8/22 9/4 9/18 10/5
Yellow Warbler *** - 8/2 8/29 9/18 9/27
Chestnut-sided Warbler ** 8/11 8/21 9/3 9/18 10/1
Yellow-throated Vireo *** 8/24 8/31 9/8 9/19 9/27
Warbling Vireo *** 8/20 8/28 9/6 9/19 9/27
American Redstart *** 8/10 8/24 9/5 9/19 9/28
Least Flycatcher *** 8/2 8/20 9/4 9/20 10/2
Red-eyed Vireo *** 8/2 8/20 9/1 9/20 10/2
Blue-gray Gnatcatcher *** - 8/2 8/30 9/20 10/1
Yellow-breasted Chat * 8/19 8/26 9/5 9/20 9/30
Eastern Wood-Pewee *** - 8/2 8/20 9/21 10/5
Black-and-white Warbler *** 8/11 8/23 9/5 9/21 10/2
Green Heron *** - 8/2 8/17 9/22 10/9
Ruby-throated Hummingbird *** - 8/2 8/31 9/22 10/5
Swainson's Thrush *** 8/24 9/1 9/11 9/22 10/1
Red-headed Woodpecker *** - 8/2 8/29 9/23 10/13
Magnolia Warbler ** 8/16 8/27 9/9 9/23 10/3

West

Moderate flights kick off the weekend in many areas west of the Continental Divide, while most areas to the east experience local and light flights. But the remainder of the weekend and beginning of the work week see less favorable conditions spread over most of the West, with migration generally low intensity flights following suite. A disturbance passing through the Pacific Northwest on Monday night ushers in a new wave of favorable conditions for migrants to take flight in moderate intensity flights on Tuesday and Wednesday. Another disturbance following immediately begets a similar, more extensive pattern of ushering in favorable migration conditions. This second system will be responsible for light to locally heavy flights in many areas of the region to end the week, with movements reaching their greatest extents by Thursday night. Note, birders in the southern Rockies and western Texas should watch closely for the movements of Hurricane Norma off the Pacific Coast of Mexico: this storm will weaken as it moves inland near the Sonora and Sinaloa border, but it may still retain a significant number of seabirds as it passes over the southeastern corner of the region. Stay tuned to BirdCast for updates.

Bell’s Vireo. Justyn Stahl/Macaulay Library. eBird S39161273.

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Canada Goose ** 8/2 11/4 After Nov 30 - -
Pied-billed Grebe ** 8/2 10/19 11/11 After Nov 30 -
California Gull * 8/2 10/22 11/7 After Nov 30 -
Ring-billed Gull ** 8/10 11/7 11/22 After Nov 30 -
Northern Harrier ** 8/17 11/8 11/20 After Nov 30 -
Marsh Wren * 8/21 9/20 10/29 After Nov 30 -
Red-necked Grebe * 8/26 10/20 11/3 11/13 11/20
American Wigeon *** 9/2 10/17 11/22 After Nov 30 -
Eared Grebe *** 9/2 9/16 11/11 After Nov 30 -
Northern Flicker *** 9/5 9/29 10/16 11/8 11/22
Red-naped Sapsucker * 9/6 9/19 10/7 10/22 11/3
White-crowned Sparrow ****! 9/6 9/21 10/11 10/21 10/31
Fox Sparrow *** 9/9 9/23 10/20 11/1 11/8
Golden-crowned Kinglet ** 9/10 10/4 10/23 11/6 11/18
Black-bellied Plover ** 9/12 9/18 9/30 After Nov 30 -
Greater White-fronted Goose *** 9/13 9/21 10/3 10/12 10/19
Yellow-rumped Warbler ****! 9/13 9/27 10/14 10/23 11/3
Golden-crowned Sparrow *** 9/13 9/26 10/19 10/26 11/18
Sandhill Crane * 9/14 11/10 11/18 After Nov 30 -
Cackling Goose ** 9/16 10/3 After Nov 30 - -
Western Meadowlark *** 9/16 9/30 10/16 After Nov 30 -
Varied Thrush *** 9/18 9/29 After Nov 30 - -
Horned Grebe ** 9/20 10/21 11/8 11/15 11/19
White-throated Sparrow ** 9/20 10/3 10/28 11/5 11/10
Ring-necked Duck *** 9/21 10/17 11/20 After Nov 30 -
Ruddy Duck *** 9/21 10/14 11/18 After Nov 30 -
Ruby-crowned Kinglet ****! 9/21 10/3 11/5 11/10 11/12
Dark-eyed Junco *** 9/23 10/5 11/8 11/13 11/16

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Blue-winged Teal * - 8/2 9/22 10/23 11/3
Common Merganser * - 8/2 9/23 9/28 9/30
Belted Kingfisher ** - 8/2 10/22 After Nov 30 -
Black-throated Gray Warbler * - 8/2 10/4 10/19 10/29
Black Turnstone * 8/6 8/17 9/21 10/2 After Nov 30
Northern Shoveler *** 8/6 8/20 11/20 After Nov 30 -
Northern Pintail ** 8/12 8/20 11/19 After Nov 30 -
Green-winged Teal ** 8/2 8/20 11/17 After Nov 30 -
Pectoral Sandpiper ** 8/16 8/25 9/20 10/9 10/24
Townsend's Warbler *** 8/13 8/30 10/2 10/22 11/6
Orange-crowned Warbler *** 8/18 9/1 9/18 10/15 10/27
Savannah Sparrow *** 8/2 9/3 9/23 10/24 11/2
American Robin ** 8/30 9/4 10/10 10/17 11/14
Parasitic Jaeger * 8/26 9/6 9/19 10/1 10/29
Common Tern * 8/24 9/6 9/17 10/1 10/11
Cooper's Hawk ** 8/2 9/7 10/1 10/24 11/11
Mountain Bluebird * 9/3 9/8 9/19 10/17 10/27
Turkey Vulture ** 8/14 9/9 9/17 10/5 10/17
Black Phoebe ** 8/16 9/9 11/17 After Nov 30 -
Summer Tanager * 9/4 9/9 9/16 10/3 10/13
Sharp-shinned Hawk * 8/23 9/10 10/19 11/11 After Nov 30
Red-tailed Hawk *** 8/7 9/10 After Nov 30 - -
Sabine's Gull * 9/2 9/11 9/21 10/3 10/13
American Pipit ** 8/31 9/11 11/15 After Nov 30 -
Lincoln's Sparrow *** 8/30 9/11 10/4 10/21 11/5
Brewer's Blackbird ** 8/23 9/11 9/27 10/20 After Nov 30
Red-shouldered Hawk ** 8/17 9/12 10/3 After Nov 30 -
Red-winged Blackbird ** 8/25 9/12 10/10 10/27 After Nov 30
Say's Phoebe ** 9/1 9/13 11/21 After Nov 30 -
Heermann's Gull * 8/15 9/14 9/21 10/2 After Nov 30
Merlin * 8/30 9/14 11/9 11/28 After Nov 30
Eared Grebe *** 9/2 9/16 11/11 After Nov 30 -
Black-bellied Plover ** 9/12 9/18 9/30 After Nov 30 -
Red-naped Sapsucker * 9/6 9/19 10/7 10/22 11/3
Marsh Wren * 8/21 9/20 10/29 After Nov 30 -
Greater White-fronted Goose *** 9/13 9/21 10/3 10/12 10/19
White-crowned Sparrow ****! 9/6 9/21 10/11 10/21 10/31
Fox Sparrow *** 9/9 9/23 10/20 11/1 11/8

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Whimbrel * - - Before Aug 1 9/29 10/13
Black Tern * - - Before Aug 1 9/22 10/4
Bell's Vireo * - - Before Aug 1 9/28 10/11
Blue Grosbeak ** - - Before Aug 1 9/16 10/9
Western Wood-Pewee *** - 8/2 8/10 9/20 9/30
Lazuli Bunting ** - 8/2 8/14 9/21 10/2
Lark Sparrow ** - 8/2 8/15 9/20 9/30
Lark Bunting * - 8/2 8/17 9/17 9/26
Swainson's Hawk ** - 8/2 8/18 9/28 10/12
Spotted Sandpiper *** - 8/2 8/18 9/17 10/3
Mourning Dove *** 8/9 8/14 8/19 9/21 10/8
Barn Swallow *** 8/2 8/9 8/23 9/17 10/12
Osprey ** - 8/2 8/25 9/16 10/2
Wandering Tattler * 8/10 8/17 8/26 10/2 10/10
White-faced Ibis ** 8/2 8/12 8/27 9/26 10/13
Black-necked Stilt ** 8/16 8/20 8/27 9/26 10/6
Green Heron * 8/2 8/10 8/28 9/23 10/17
Greater Yellowlegs * 8/11 8/18 8/28 After Nov 30 -
Marbled Godwit * 8/9 8/17 8/28 9/29 After Nov 30
Virginia's Warbler * 8/2 8/14 8/28 9/16 10/1
Olive-sided Flycatcher ** 8/23 8/26 8/29 9/17 9/28
American Avocet * 8/15 8/21 8/30 9/30 After Nov 30
Franklin's Gull * - 8/2 8/31 10/3 11/5
Sage Thrasher * - 8/2 8/31 9/20 10/13
Red-necked Phalarope *** 8/8 8/20 9/1 9/16 10/9
Cinnamon Teal * 8/2 8/13 9/2 9/27 10/13
American White Pelican * 8/2 8/13 9/2 9/27 10/19
Gray Catbird ** 8/2 8/25 9/2 9/17 9/26
Yellow-headed Blackbird * 8/6 8/22 9/2 9/23 10/11
Willow Flycatcher *** 8/14 8/26 9/5 9/19 9/29
Nashville Warbler ** - 8/2 9/5 9/19 9/29
MacGillivray's Warbler *** - 8/2 9/5 9/21 10/2
Plumbeous Vireo * 8/27 8/31 9/6 9/19 9/27
Killdeer ** 8/2 8/14 9/7 10/3 11/3
Elegant Tern * 8/2 8/21 9/7 After Nov 30 -
Red-breasted Nuthatch * - 8/2 9/7 10/19 10/30
Sanderling * 8/2 8/17 9/8 9/26 10/6
Hammond's Flycatcher * 8/24 8/31 9/8 9/19 9/26
Cassin's Vireo ** 8/2 8/29 9/8 9/20 9/29
Yellow Warbler *** - 8/2 9/8 10/2 10/21
Wilson's Warbler *** 8/2 8/27 9/8 9/24 10/9
Chipping Sparrow *** - 8/2 9/8 10/18 11/2
Western Tanager *** 8/23 8/30 9/8 9/21 10/3
Warbling Vireo *** 8/21 8/29 9/9 9/22 10/9
House Wren *** 8/23 8/31 9/9 9/21 10/26
Brewer's Sparrow ** 8/2 8/29 9/9 9/24 10/5
Blue-gray Gnatcatcher * - 8/2 9/10 9/22 10/3
Swainson's Thrush ** 8/22 8/29 9/10 9/25 10/7
Pacific-slope Flycatcher ** 8/14 8/25 9/12 10/3 10/17
Sora * 8/21 9/1 9/13 9/23 After Nov 30
Green-tailed Towhee ** 8/28 9/4 9/13 9/24 10/3
Vesper Sparrow ** 8/24 9/2 9/13 9/27 10/15
Pink-footed Shearwater * 8/8 8/27 9/14 10/25 11/7
Vaux's Swift ** 8/28 9/5 9/14 10/3 10/20
Clay-colored Sparrow * 8/17 8/28 9/14 10/18 11/6
Sooty Shearwater ** 8/2 9/5 9/15 9/29 10/8
Common Yellowthroat *** 8/18 8/30 9/15 10/5 10/27
Summer Tanager * 9/4 9/9 9/16 10/3 10/13
Turkey Vulture *** 8/14 9/9 9/17 10/5 10/17
Common Tern * 8/24 9/6 9/17 10/1 10/11
Orange-crowned Warbler *** 8/18 9/1 9/18 10/15 10/27
Parasitic Jaeger * 8/26 9/6 9/19 10/1 10/29
Mountain Bluebird * 9/3 9/8 9/19 10/17 10/27
Pectoral Sandpiper ** 8/16 8/25 9/20 10/9 10/24
Black Turnstone * 8/6 8/17 9/21 10/2 After Nov 30
Sabine's Gull * 9/2 9/11 9/21 10/3 10/13
Heermann's Gull ** 8/15 9/14 9/21 10/2 After Nov 30
Blue-winged Teal * - 8/2 9/22 10/23 11/3
Common Merganser * - 8/2 9/23 9/28 9/30
Savannah Sparrow ** 8/2 9/3 9/23 10/24 11/2

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Tree Swallow *** - - Before Aug 1 8/3 9/17
Violet-green Swallow *** - - Before Aug 1 8/3 10/23
Yellow-breasted Chat * - - Before Aug 1 8/3 9/25
Hooded Oriole ** - - Before Aug 1 8/3 9/22
Broad-billed Hummingbird * - - Before Aug 1 8/7 9/16
Broad-tailed Hummingbird *** - - Before Aug 1 9/1 9/26
Common Nighthawk ** - - Before Aug 1 9/2 9/24
Hermit Warbler * - 8/2 8/19 9/3 10/23
Western Kingbird *** - - Before Aug 1 9/4 9/24
Purple Martin * - - Before Aug 1 9/4 9/20
Calliope Hummingbird * - - Before Aug 1 9/5 9/24
Lesser Yellowlegs ** 8/2 8/15 8/25 9/6 10/7
Least Sandpiper *** 8/2 8/14 8/25 9/6 9/16
Western Sandpiper *** 8/2 8/14 8/25 9/6 10/5
Caspian Tern *** - - Before Aug 1 9/7 9/27
Rufous Hummingbird *** - - Before Aug 1 9/7 9/24
Semipalmated Plover *** 8/9 8/17 8/26 9/8 9/20
Baird's Sandpiper *** 8/3 8/17 8/27 9/8 9/20
Wilson's Phalarope ** - - Before Aug 1 9/8 9/27
Solitary Sandpiper ** 8/2 8/13 8/26 9/9 9/22
Northern Rough-winged Swallow ** - - Before Aug 1 9/10 9/25
Snowy Plover * - - Before Aug 1 9/11 10/1
Bank Swallow ** - 8/2 8/17 9/11 9/25
Black-chinned Hummingbird *** - - Before Aug 1 9/14 10/3
Black-headed Grosbeak *** - - Before Aug 1 9/14 9/28
Osprey *** - 8/2 8/25 9/16 10/2
Red-necked Phalarope *** 8/8 8/20 9/1 9/16 10/9
Virginia's Warbler * 8/2 8/14 8/28 9/16 10/1
Blue Grosbeak ** - - Before Aug 1 9/16 10/9
Spotted Sandpiper *** - 8/2 8/18 9/17 10/3
Olive-sided Flycatcher ** 8/23 8/26 8/29 9/17 9/28
Barn Swallow *** 8/2 8/9 8/23 9/17 10/12
Gray Catbird ** 8/2 8/25 9/2 9/17 9/26
Lark Bunting * - 8/2 8/17 9/17 9/26
Willow Flycatcher *** 8/14 8/26 9/5 9/19 9/29
Hammond's Flycatcher ** 8/24 8/31 9/8 9/19 9/26
Plumbeous Vireo * 8/27 8/31 9/6 9/19 9/27
Nashville Warbler ** - 8/2 9/5 9/19 9/29
Western Wood-Pewee *** - 8/2 8/10 9/20 9/30
Cassin's Vireo ** 8/2 8/29 9/8 9/20 9/29
Sage Thrasher * - 8/2 8/31 9/20 10/13
Lark Sparrow ** - 8/2 8/15 9/20 9/30
Mourning Dove *** 8/9 8/14 8/19 9/21 10/8
House Wren *** 8/23 8/31 9/9 9/21 10/26
MacGillivray's Warbler *** - 8/2 9/5 9/21 10/2
Western Tanager *** 8/23 8/30 9/8 9/21 10/3
Lazuli Bunting *** - 8/2 8/14 9/21 10/2
Black Tern * - - Before Aug 1 9/22 10/4
Warbling Vireo *** 8/21 8/29 9/9 9/22 10/9
Blue-gray Gnatcatcher * - 8/2 9/10 9/22 10/3
Green Heron * 8/2 8/10 8/28 9/23 10/17
Sora * 8/21 9/1 9/13 9/23 After Nov 30
Yellow-headed Blackbird ** 8/6 8/22 9/2 9/23 10/11

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Farnsworth and Van Doren

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