Regional Migration Forecast: 23-30 September 2016

White-throated Sparrow. Jay McGowan/Macaulay Library. eBird S31628294

White-throated Sparrow. Jay McGowan/Macaulay Library. eBird S31628294

Continental Summary

Favorable conditions for widespread light to moderate migration featuring Greater White-fronted Goose, Northern Shoveler, Eared Grebe, Red-tailed Hawk, Townsend’s Warbler, Yellow-rumped Warbler, and White-crowned Sparrow come to the West during the first half of the forecast period, while the East experiences several bouts of favorable migration conditions with moderate to locally very heavy flights of Pied-billed Grebe, Turkey Vulture, Franklin’s Gull, Ruby-crowned Kinglet, Gray Catbird, Ovenbird, Tennessee Warbler, Yellow-rumped Warbler, and White-throated Sparrow.

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!

Additionally, 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

Moderate to locally very heavy flights will be widespread over the weekend, gradually becoming more restricted to coastal areas and New England by Sunday night. Conditions for morning flights in New England and the Canadian Maritimes, in particular, should have birders prepared to visit their favorite coastal sites on Sunday or Monday depending on the timing of strong winds forecast in the area (if strong winds come at night, go birding in the morning!). These conditions coincide with the offshore passage of the remnants of Karl and a shift in North Atlantic winds (see below). As a disturbance shuts down flights by Monday and Tuesday to the east of the Great Lakes and Appalachians, a new round of marginal and favorable conditions follow and bring more moderate to heavy flights. After first occurring in the Midwest, this new pulse of movements reaches the greatest extents on Wednesday night but continues in many areas through Thursday night. Note, also, that a favorable pattern of easterly flow across the North Atlantic will be in place late this weekend – as is usually the case with such flow, birders in the Canadian Maritimes and New England should be watchful in the coming week for European surprises . . .

Pine Warbler. Bob Edelen/Macaulay Library. eBird S31694160

Pine Warbler. Bob Edelen/Macaulay Library. eBird S31694160

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 -
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 - -
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
Wilson's Snipe ** 9/24 10/3 10/16 10/29 After Nov 30
Red-winged Blackbird *** 9/24 10/4 10/18 11/6 After Nov 30
Hermit Thrush *** 9/25 10/6 10/19 10/31 11/10
Surf Scoter ** 9/25 10/19 11/4 11/12 11/17
Purple Finch *** 9/26 10/8 10/24 11/8 After Nov 30
Pine Siskin *** 9/27 10/10 10/28 11/11 After Nov 30
Redhead * 9/28 10/19 11/14 11/18 11/20
Dark-eyed Junco ****! 9/28 10/14 11/10 11/16 11/22
Fox Sparrow *** 9/28 10/16 11/9 After Nov 30 -
Ruddy Duck *** 9/29 10/17 11/8 11/23 After Nov 30
Field Sparrow *** 9/29 10/8 10/18 10/30 11/8

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Sora * 8/12 8/21 9/24 10/12 10/25
Black-throated Blue Warbler *** 8/23 9/2 9/25 10/14 10/23
Red-breasted Nuthatch ** 8/12 9/4 10/2 10/17 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
Blue Jay *** 8/23 9/8 9/28 10/30 11/26
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
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
Savannah Sparrow *** 9/12 9/26 10/12 10/29 11/12
Eastern Bluebird *** 9/12 9/27 10/18 11/12 After Nov 30
Winter Wren *** 9/17 9/28 10/15 10/28 11/8
Horned Lark * 9/23 9/29 10/10 10/15 10/17
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
Ruby-crowned Kinglet ****! 9/18 9/30 10/14 10/28 11/8
Eastern Towhee *** 9/23 9/30 10/9 10/23 11/3
Swamp Sparrow *** 9/20 9/30 10/13 10/27 11/10
White-throated Sparrow ****! 9/18 9/30 10/18 10/31 11/12

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
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
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
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
Blackburnian Warbler *** 8/12 8/23 9/8 9/26 10/7
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
Sora * 8/12 8/21 9/24 10/12 10/25
Northern Flicker *** 8/30 9/12 9/25 10/10 10/30
Black-throated Blue Warbler *** 8/23 9/2 9/25 10/14 10/23
Indigo Bunting *** 9/10 9/16 9/25 10/12 10/21
American Kestrel ** 8/29 9/6 9/26 10/22 11/2
Blue Jay *** 8/23 9/8 9/28 10/30 11/26
Eastern Phoebe *** 9/9 9/18 9/30 10/18 11/3
Marsh Wren * 9/7 9/19 9/30 10/17 10/29

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
Blue Grosbeak * - - Before Aug 1 8/31 10/17
Ruddy Turnstone ** - 8/2 8/10 9/2 9/25
Lesser Yellowlegs *** - 8/2 8/19 9/5 9/24
Pectoral Sandpiper ** 8/11 8/17 8/23 9/7 11/13
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
Great Crested Flycatcher *** 8/15 8/21 8/27 9/14 9/24
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
Eastern Wood-Pewee *** 8/7 8/18 8/29 9/24 10/9
Northern Waterthrush *** 8/2 8/31 9/10 9/24 10/9
Hooded Warbler * 8/23 8/31 9/10 9/24 10/5
Cedar Waxwing *** - 8/2 8/17 9/25 After Nov 30
Chestnut-sided Warbler *** 8/14 8/26 9/9 9/25 10/6
Prairie Warbler ** - 8/2 9/10 9/25 10/7
Bald Eagle ** 8/2 9/5 9/17 9/26 10/1
Forster's Tern * - 8/2 8/16 9/26 After Nov 30
American Redstart *** 8/20 8/31 9/12 9/26 10/8
Blackburnian Warbler *** 8/12 8/23 9/8 9/26 10/7
Red-headed Woodpecker * 8/23 9/1 9/11 9/27 10/13
Yellow-billed Cuckoo ** - 8/2 8/6 9/28 10/12
Philadelphia Vireo *** 8/27 9/5 9/16 9/28 10/7
Red-eyed Vireo *** 8/15 8/24 9/7 9/28 10/11
Bay-breasted Warbler *** 8/26 9/4 9/15 9/28 10/8
Broad-winged Hawk *** 8/31 9/8 9/18 9/29 10/7
Swainson's Thrush *** 8/27 9/5 9/17 9/30 10/14
Ovenbird *** 8/15 8/29 9/12 9/30 10/12
Black-and-white Warbler *** 8/2 8/29 9/13 9/30 10/11
Rose-breasted Grosbeak *** 8/30 9/7 9/17 9/30 10/9

Gulf Coast and Southeast

A patchwork of favorable migration conditions, mostly east of the Mississippi River, will bring locally moderate to heavy flights to kick off the weekend. More widespread favorable conditions for more extensive moderate to heavy flights arrive on Monday and Tuesday, continuing mostly through the end of the period. Note that precipitation is forecast and will likely interact with these flights, particularly in parts of Texas and Florida. Birders should watch the distributions of these interactions and overlaps between birds and precipitation for local concentrations and fallouts.

Gray Catbird. Bob Edelen/Macaulay Library. eBird S31714763

Gray Catbird. Bob Edelen/Macaulay Library. eBird S31714763

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 -
American Avocet * 8/2 10/22 11/7 After Nov 30 -
Black Vulture ** 8/28 9/30 11/18 After Nov 30 -
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
Scissor-tailed Flycatcher ** 9/8 9/23 10/7 11/3 11/23
Eastern Towhee ** 9/10 10/10 10/19 11/1 11/12
American Kestrel *** 9/12 9/29 11/12 After Nov 30 -
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
Tree Swallow *** 9/24 10/3 11/2 11/14 11/22
Pied-billed Grebe *** 9/25 10/31 11/20 After Nov 30 -
Eastern Phoebe ****! 9/25 10/9 10/30 After Nov 30 -
Northern Rough-winged Swallow * 9/25 10/3 10/13 11/2 11/20
Ruby-crowned Kinglet ****! 9/26 10/14 11/16 11/24 After Nov 30
Double-crested Cormorant *** 9/27 10/11 11/22 After Nov 30 -
Sedge Wren ** 9/28 10/11 11/2 After Nov 30 -
Painted Bunting * 9/28 10/4 10/14 10/29 11/9
American White Pelican *** 9/29 10/30 11/15 11/21 After Nov 30
Common Grackle *** 9/29 10/9 10/21 After Nov 30 -
Wilson's Snipe *** 9/30 10/15 11/14 After Nov 30 -
Yellow-bellied Sapsucker ****! 9/30 10/9 10/24 10/31 11/6

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 -
Blue-winged Teal * 8/8 8/26 11/8 11/29 After Nov 30
Pine Warbler *** 8/15 9/1 10/9 10/26 11/3
Yellow-throated Warbler ** 8/2 9/3 9/25 10/20 11/4
Black-throated Green Warbler ** 8/28 9/6 10/10 10/25 11/6
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
Sharp-shinned Hawk ** 9/8 9/24 10/28 11/15 After Nov 30
Peregrine Falcon *** 9/15 9/25 10/7 10/18 10/26
Gray Catbird ****! 9/16 9/27 10/10 10/23 11/6
Brown-headed Cowbird ** 9/15 9/27 10/23 After Nov 30 -
American Kestrel *** 9/12 9/29 11/12 After Nov 30 -
Black Vulture ** 8/28 9/30 11/18 After Nov 30 -
Indigo Bunting *** 9/21 9/30 10/11 10/25 11/5

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
Yellow-crowned Night-Heron * - - Before Aug 1 10/8 10/23
Common Tern * - 8/2 8/18 9/30 11/10
Piping Plover * - 8/2 8/20 After Nov 30 -
Prothonotary Warbler * 8/2 8/15 8/29 9/24 10/6
Kentucky Warbler * 8/2 8/13 9/4 9/25 10/6
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
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
Broad-winged Hawk ** 9/6 9/15 9/25 10/6 10/16
Ovenbird *** 8/26 9/11 9/25 10/25 11/5
Yellow-throated Warbler ** 8/2 9/3 9/25 10/20 11/4
Cape May Warbler * 9/3 9/12 9/25 10/28 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
Swainson's Thrush *** 9/8 9/17 9/29 10/13 10/23

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
Louisiana Waterthrush * - 8/2 8/13 9/6 9/30
Barn Swallow *** - 8/2 8/10 9/9 11/14
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
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
Olive-sided Flycatcher ** - 8/2 9/6 9/24 10/4
Least Flycatcher *** 8/2 9/2 9/12 9/24 10/5
Prothonotary Warbler ** 8/2 8/15 8/29 9/24 10/6
Kentucky Warbler * 8/2 8/13 9/4 9/25 10/6
Blue-gray Gnatcatcher *** 8/2 8/29 9/12 9/26 10/15
Warbling Vireo * 8/28 9/6 9/17 9/29 10/8
Cedar Waxwing * 8/28 9/6 9/18 9/29 10/7
Blue-winged Warbler ** 8/21 9/2 9/15 9/29 10/10
Wilson's Warbler *** 8/27 9/4 9/17 9/29 10/16
Common Tern * - 8/2 8/18 9/30 11/10
Yellow-throated Vireo *** 8/17 8/31 9/15 9/30 10/13
Yellow Warbler *** - 8/2 9/8 9/30 10/13

Great Plains

Unfavorable conditions begin the weekend, as a frontal boundary arrives in the region. However, the end of the weekend brings a marked change, with widespread favorable conditions for moderate to very heavy flights across the Plains. This burst of activity will be reasonably short-lived, as southerly flow returns by early in the work week, keeping many more birds grounded. But the northern Plains will continue to experience locally moderate flights into the end of the period. Note also that Sunday and Monday will be excellent days for observing diurnal migration, so pick your favorite skywatching spot for a long visit!

Ruby-crowned Kinglet. Yves Dugré/Macaulay Library. eBird S31703824

Ruby-crowned Kinglet. Yves Dugré/Macaulay Library. eBird S31703824

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 - -
Sharp-shinned Hawk *** 8/31 10/2 10/17 10/28 After Nov 30
Red-tailed Hawk *** 9/5 9/27 10/27 11/9 After Nov 30
Western Grebe * 9/6 10/17 10/31 After Nov 30 -
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
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
Golden-crowned Kinglet *** 9/25 10/12 11/5 11/15 After Nov 30
Le Conte's Sparrow *** 9/25 10/4 10/16 10/28 11/7
Song Sparrow *** 9/26 10/8 10/24 11/6 11/17
Pine Siskin ** 9/26 10/9 11/2 After Nov 30 -
Dark-eyed Junco ****! 9/29 10/14 11/20 After Nov 30 -
Herring Gull *** 9/30 10/24 After Nov 30 - -

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
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
Merlin * 8/19 9/6 10/24 11/8 11/24
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
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
Chipping Sparrow * 9/20 9/24 10/1 11/1 11/13
Double-crested Cormorant *** 9/10 9/26 10/23 After Nov 30 -
Yellow-rumped Warbler ****! 9/15 9/26 10/11 10/24 11/15
Red-winged Blackbird *** 9/12 9/26 10/22 After Nov 30 -
Red-tailed Hawk *** 9/5 9/27 10/27 11/9 After Nov 30
Yellow-bellied Sapsucker * 9/12 9/27 After Nov 30 - -
Marsh Wren ** 9/14 9/27 10/9 10/23 11/5
Sedge Wren *** 9/19 9/28 10/9 10/21 10/31
White-throated Sparrow *** 9/16 9/28 10/15 11/6 11/17
Sprague's Pipit * 9/19 9/29 10/11 10/25 11/6
Nelson's Sparrow ** 9/23 9/30 10/10 10/21 10/29

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
Chimney Swift *** - 8/2 8/15 10/11 10/20
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
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
White-faced Ibis * - 8/2 9/1 10/2 10/30
Rose-breasted Grosbeak ** 8/2 8/12 9/2 9/29 10/12
Sanderling * 8/2 8/20 9/6 10/7 10/26
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
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
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
Cooper's Hawk ** 8/2 9/5 9/24 10/24 11/8
Peregrine Falcon * 8/2 9/13 9/24 10/9 10/23
Clay-colored Sparrow *** 8/20 9/3 9/24 10/16 10/30
Eastern Phoebe *** 9/1 9/13 9/25 10/12 10/25
Turkey Vulture *** 8/2 9/4 9/27 10/16 10/25
Sora * - 8/2 9/27 10/20 11/4
Scissor-tailed Flycatcher *** 9/6 9/16 9/27 10/19 11/1
Red-shouldered Hawk * 8/2 9/7 9/29 10/28 11/25
American Golden-Plover * 8/12 9/22 9/30 10/12 11/16

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Yellow-crowned Night-Heron * - - Before Aug 1 8/17 10/10
Yellow-billed Cuckoo *** - - Before Aug 1 8/17 10/2
Willet * - - Before Aug 1 8/26 9/29
Black-bellied Plover * - 8/2 8/21 9/1 11/21
Pectoral Sandpiper ** - - Before Aug 1 9/2 10/23
Bobolink * - - Before Aug 1 9/4 10/2
Little Blue Heron ** 8/2 8/11 8/21 9/8 10/7
Spotted Sandpiper *** - - Before Aug 1 9/9 9/29
Semipalmated Sandpiper *** 8/2 8/13 8/20 9/9 9/23
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
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
Northern Parula *** 8/26 9/2 9/12 9/24 10/5
Caspian Tern ** 8/2 8/31 9/11 9/26 10/9
Say's Phoebe ** 8/16 8/28 9/7 9/26 10/8
Black-crowned Night-Heron * - 8/2 8/27 9/27 10/28
White-eyed Vireo ** 8/24 9/1 9/12 9/27 10/8
Philadelphia Vireo ** 8/18 8/31 9/13 9/27 10/6
Yellow-headed Blackbird *** - 8/2 8/9 9/27 10/8
Blue-headed Vireo *** 8/25 9/2 9/16 9/28 10/24
Red-necked Phalarope * 8/2 8/22 9/7 9/29 10/15
Brown Thrasher *** 8/26 9/4 9/14 9/29 10/9
Rose-breasted Grosbeak ** 8/2 8/12 9/2 9/29 10/12

West

Widespread favorable conditions for migration reach their peak for the forecast period on Saturday night, bringing moderate to locally heavy flights to many areas east of the Rockies and moderate flights to many areas west of the Rockies. As the work week begins, less favorable southerly flow builds, particularly in the northern half of the region, while slightly more favorable conditions along the Pacific coast and Desert Southwest allow light to moderate movements to continue locally in these areas. Wednesday and Thursday nights see this pattern reverse, with more favorable conditions for light to moderate flights move north. Note, Sunday should be a particularly good day for skywatching along the eastern front of the Rockies.

Townsend's Warbler. Brad Singer/Macaulay Library. eBird S31643465

Townsend’s Warbler. Brad Singer/Macaulay Library. eBird S31643465

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 -
Red-necked Grebe * 8/26 10/20 11/3 11/13 11/20
American Wigeon *** 9/2 10/17 11/22 After Nov 30 -
Northern Flicker *** 9/5 9/29 10/16 11/8 11/22
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
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
Hermit Thrush *** 9/25 10/6 10/26 11/6 11/15
Bald Eagle ** 9/26 10/19 After Nov 30 - -
Herring Gull ** 9/28 10/13 After Nov 30 - -

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
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
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 -
Townsend's Warbler *** 8/13 8/30 10/2 10/22 11/6
Savannah Sparrow *** 8/2 9/3 9/23 10/24 11/2
American Robin ** 8/30 9/4 10/10 10/17 11/14
Cooper's Hawk ** 8/2 9/7 10/1 10/24 11/11
Black Phoebe ** 8/16 9/9 11/17 After Nov 30 -
Sharp-shinned Hawk * 8/23 9/10 10/19 11/11 After Nov 30
Red-tailed Hawk *** 8/7 9/10 After Nov 30 - -
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 -
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
Golden-crowned Sparrow *** 9/13 9/26 10/19 10/26 11/18
Yellow-rumped Warbler ****! 9/13 9/27 10/14 10/23 11/3
Northern Flicker *** 9/5 9/29 10/16 11/8 11/22
Varied Thrush ** 9/18 9/29 After Nov 30 - -
Western Meadowlark *** 9/16 9/30 10/16 After Nov 30 -

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
Bell's Vireo * - - Before Aug 1 9/28 10/11
Swainson's Hawk ** - 8/2 8/18 9/28 10/12
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
American Avocet * 8/15 8/21 8/30 9/30 After Nov 30
Franklin's Gull * - 8/2 8/31 10/3 11/5
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
Yellow-headed Blackbird * 8/6 8/22 9/2 9/23 10/11
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
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
Brewer's Sparrow ** 8/2 8/29 9/9 9/24 10/5
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
Brewer's Blackbird ** 8/23 9/11 9/27 10/20 After Nov 30
Black-bellied Plover * 9/12 9/18 9/30 After Nov 30 -

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Violet-green Swallow *** - - Before Aug 1 8/3 10/23
Yellow-breasted Chat * - - Before Aug 1 8/3 9/25
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
Calliope Hummingbird * - - Before Aug 1 9/5 9/24
Lesser Yellowlegs ** 8/2 8/15 8/25 9/6 10/7
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
Wilson's Phalarope ** - - Before Aug 1 9/8 9/27
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
Wilson's Warbler *** 8/2 8/27 9/8 9/24 10/9
Green-tailed Towhee *** 8/28 9/4 9/13 9/24 10/3
Brewer's Sparrow ** 8/2 8/29 9/9 9/24 10/5
Swainson's Thrush *** 8/22 8/29 9/10 9/25 10/7
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
Sanderling * 8/2 8/17 9/8 9/26 10/6
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
Vesper Sparrow ** 8/24 9/2 9/13 9/27 10/15
Common Merganser * - 8/2 9/23 9/28 9/30
Swainson's Hawk ** - 8/2 8/18 9/28 10/12
Bell's Vireo * - - Before Aug 1 9/28 10/11
Sooty Shearwater ** 8/2 9/5 9/15 9/29 10/8
Whimbrel * - - Before Aug 1 9/29 10/13
Marbled Godwit * 8/9 8/17 8/28 9/29 After Nov 30
American Avocet * 8/15 8/21 8/30 9/30 After Nov 30

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Farnsworth and Van Doren

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