Regional Migration Forecast: 29 September – 6 October

Northern Flicker (Yellow-shafted). Tom Johnson/Macaulay Library. eBird S31752577

Continental Summary

Favorable migration conditions from mid weekend through the middle of the work week bring light and moderate flights featuring Greater White-fronted Goose, Cooper’s Hawk, Red-shouldered Hawk, Black-bellied Plover, Townsend’s Warbler, and Lincoln’s Sparrow to the West this period, while moderate to very heavy flights that feature Swainson’s Hawk, American Golden-Plover, Northern Flicker, Eastern Phoebe, Blue-headed Vireo, Palm Warbler, and Magnolia Warbler grace the East for the first half of the period in advance of less favorable migration conditions building in many areas later in the period.

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.

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Quick Links to Regions

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BirdCast West Region

Upper Midwest and Northeast

The arrival of a cool and dry airmass brings moderate to locally very heavy flights to most of the region for the first days of the period. This includes some morning flight in coastal locations, particularly on Friday morning. By late in the weekend, only coastal areas will continue to experience favorable and marginal migration conditions, and moderate flights will occur primarily east of the Hudson River. By Monday night a pattern of warmer air and less favorable winds establishes itself for the days that follow, keeping migration local and generally light. Some areas may see more intense movements, as small pockets of marginal and even favorable conditions occur in the region. The first signs of some changes are late in the period, when a disturbance brings a change of wind to some parts of the region, particular northern New England where moderate to locally heavy flights will occur.

Blue-headed Vireo. Jay McGowan/Macaulay Library. eBird S39211325.

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
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 - -
Dunlin ** 9/13 10/17 10/29 11/11 11/22
Chipping Sparrow *** 9/16 10/2 10/12 10/29 11/9
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
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 - -
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
Brant *** 10/1 10/13 10/30 11/8 11/15
Common Grackle *** 10/2 10/8 10/18 11/7 After Nov 30
Gadwall *** 10/4 10/19 11/12 11/22 After Nov 30
Vesper Sparrow ** 10/5 10/12 10/21 11/2 11/10
Ring-necked Duck *** 10/7 10/23 11/9 11/17 11/24

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Red-breasted Nuthatch ** 8/12 9/4 10/2 10/17 After Nov 30
Cooper's Hawk ** 8/2 9/7 10/11 10/28 11/8
Sharp-shinned Hawk *** 8/31 9/10 10/17 10/30 After Nov 30
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
Golden-crowned Kinglet ****! 9/22 10/1 10/15 11/6 11/18
Song Sparrow *** 9/19 10/1 10/14 10/28 11/10
Chipping Sparrow *** 9/16 10/2 10/12 10/29 11/9
Eastern Meadowlark ** 9/17 10/2 10/16 10/30 11/11
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
Rusty Blackbird ** 9/19 10/3 10/23 11/10 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

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
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
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
Blue-winged Teal ** 8/2 8/19 9/7 10/22 11/5
Wood Thrush ** 8/22 8/28 9/12 10/1 10/12
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
House Wren *** 8/30 9/5 9/15 10/7 10/21
Tennessee Warbler *** 8/17 8/29 9/15 10/4 10/19
Scarlet Tanager *** 8/24 9/3 9/15 10/1 10/12
Magnolia Warbler *** 8/20 9/1 9/16 10/2 10/13
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
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
Red-breasted Nuthatch ** 8/12 9/4 10/2 10/17 After Nov 30
Peregrine Falcon ** 8/2 9/23 10/4 10/17 10/28
Blue-headed Vireo *** 9/8 9/21 10/4 10/19 10/31
Yellow-bellied Sapsucker *** 9/16 9/25 10/5 10/16 10/24
Lincoln's Sparrow *** 9/10 9/22 10/5 10/19 10/31
Palm Warbler *** 9/2 9/21 10/6 10/21 11/1

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
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
Pectoral Sandpiper ** 8/11 8/17 8/23 9/7 11/13
Solitary Sandpiper *** - 8/2 8/13 9/11 9/30
Caspian Tern ** - 8/2 8/20 9/12 10/22
Green Heron *** - 8/2 8/12 9/16 10/5
Bobolink ** 8/2 8/19 9/2 9/16 10/19
Whimbrel * - - Before Aug 1 9/19 10/3
Yellow-bellied Flycatcher ** 8/13 8/24 9/6 9/20 9/30
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
Wood Thrush *** 8/22 8/28 9/12 10/1 10/12
Scarlet Tanager *** 8/24 9/3 9/15 10/1 10/12
Cape May Warbler *** 8/25 9/4 9/18 10/2 10/15
Magnolia Warbler *** 8/20 9/1 9/16 10/2 10/13
Summer Tanager ** 8/27 9/7 9/17 10/2 10/12
Brown Thrasher *** 8/30 9/9 9/21 10/4 10/17
Tennessee Warbler *** 8/17 8/29 9/15 10/4 10/19
Northern Parula *** 8/28 9/7 9/20 10/4 10/15
Gray-cheeked Thrush ** 9/2 9/11 9/23 10/5 10/14
Black-throated Green Warbler *** 8/24 9/7 9/21 10/6 10/17
House Wren *** 8/30 9/5 9/15 10/7 10/21

Gulf Coast and Southeast

Moderate to very heavy flights grace the region for the first half of the weekend, as the passage of a cold front and the arrival of cooler and drier air spawns intense movements. By Sunday less favorable conditions build from both the east and the west – a developing tropical disturbance keeps many birds in Florida and the coastal plains grounded, while warmer air and southerly flow has a similar effect farther west. Although this pattern generally remains in place during the remainder of the period, some later period weakening is forecast to occur – where this happens, particularly in Florida through the Carolinas, more favorable migration conditions with moderate to locally very heavy flights will occur.

Black-throated Green Warbler. Doug Johnston/Macaulay Library. eBird S39437018.

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
Eastern Towhee ** 9/10 10/10 10/19 11/1 11/12
American Bittern * 9/14 10/9 11/12 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 -
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
Red-tailed Hawk *** 10/1 10/26 11/20 After Nov 30 -
Red-breasted Nuthatch ** 10/2 10/11 10/23 After Nov 30 -
Western Meadowlark * 10/2 10/19 11/12 After Nov 30 -
Eastern Meadowlark *** 10/2 10/15 11/3 11/23 After Nov 30
Spotted Towhee * 10/5 10/16 After Nov 30 - -
Savannah Sparrow *** 10/5 10/20 11/10 11/27 After Nov 30
Brown Creeper ** 10/6 10/18 11/23 After Nov 30 -
Yellow-rumped Warbler ****! 10/6 10/18 After Nov 30 - -
Winter Wren *** 10/7 10/17 After Nov 30 - -
Golden-crowned Kinglet *** 10/7 10/17 11/15 After Nov 30 -
Song Sparrow *** 10/7 10/19 11/17 After Nov 30 -

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
Black-throated Green Warbler ** 8/28 9/6 10/10 10/25 11/6
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
Magnolia Warbler *** 8/31 9/13 10/1 10/19 10/31
Bald Eagle ** 9/3 9/15 11/21 After Nov 30 -
Clay-colored Sparrow * 9/2 9/16 10/4 10/21 11/6
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
Northern Flicker *** 9/18 10/1 10/17 10/29 11/8
Northern Rough-winged Swallow * 9/25 10/3 10/13 11/2 11/20
Tree Swallow ** 9/24 10/3 11/2 11/14 11/22
Marsh Wren ** 9/20 10/3 11/1 11/18 After Nov 30
Lincoln's Sparrow ** 9/23 10/4 10/31 11/13 11/21
Painted Bunting * 9/28 10/4 10/14 10/29 11/9
Red-winged Blackbird *** 9/22 10/4 11/9 After Nov 30 -
Palm Warbler *** 9/15 10/5 10/20 10/31 11/7
House Wren *** 9/23 10/6 10/28 11/12 After Nov 30

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 -
Yellow Warbler *** - 8/2 9/8 9/30 10/13
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
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
Red-eyed Vireo *** 8/20 9/3 9/17 10/8 10/24
Red-headed Woodpecker ** 8/22 9/4 9/18 10/26 11/5
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
Magnolia Warbler *** 8/31 9/13 10/1 10/19 10/31
Swainson's Hawk * - 8/2 10/2 10/16 10/28
Wood Thrush ** 9/10 9/21 10/2 10/15 10/25
Tennessee Warbler *** 8/31 9/11 10/3 10/23 11/3
Nashville Warbler ** 8/30 9/11 10/4 10/24 11/12
Clay-colored Sparrow * 9/2 9/16 10/4 10/21 11/6
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
Common Yellowthroat *** 9/1 9/17 10/6 10/21 11/2
Peregrine Falcon ** 9/15 9/25 10/7 10/18 10/26
Scissor-tailed Flycatcher *** 9/8 9/23 10/7 11/3 11/23

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
Louisiana Waterthrush * - 8/2 8/13 9/6 9/30
Barn Swallow *** - 8/2 8/10 9/9 11/14
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
Cave Swallow * 8/2 8/28 9/4 9/16 11/21
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
Yellow-bellied Flycatcher ** 8/2 9/4 9/16 10/1 10/11
Veery *** 8/31 9/8 9/20 10/1 10/10
Worm-eating Warbler ** 8/11 8/23 9/16 10/1 10/10
Summer Tanager *** 8/21 9/1 9/15 10/1 10/18
Acadian Flycatcher *** 8/21 9/1 9/15 10/2 10/16
Cattle Egret ** - - Before Aug 1 10/3 10/18
Northern Waterthrush *** 8/15 9/7 9/20 10/3 10/13
Blackburnian Warbler ** 8/26 9/5 9/18 10/3 10/28
Ruby-throated Hummingbird *** 8/13 8/29 9/13 10/4 10/19
Hooded Warbler *** 8/8 8/20 9/20 10/5 10/29
Broad-winged Hawk ** 9/6 9/15 9/25 10/6 10/16

Great Plains

Most of the period will be dominated by marginal and unfavorable migration conditions, as several disturbances and a warm air mass keep most birds on the ground. To begin and end the week, local moderate to heavy flights are likely, with greater extents in the first days of the period. The northern Plains are the most likely areas to experience migration in the mid week period, as some favorable conditions associated with a slow-moving frontal boundary opens some possibilities for flights. Birders in the northern Plains should watch the passage or stall of this frontal boundary, as there is good potential for fallouts and concentrations across a broad area where precipitation is forecast along the boundary.

Orange-crowned Warbler. Tony Leukering/Macaulay Library. eBird S39439528.

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
Western Grebe * 9/6 10/17 10/31 After Nov 30 -
Northern Harrier *** 9/12 10/11 10/28 11/12 After Nov 30
Savannah Sparrow *** 9/13 10/3 10/15 10/29 11/8
American Pipit *** 9/17 10/6 10/24 11/12 After Nov 30
Brown Creeper ** 9/18 10/5 After Nov 30 - -
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 - -
American Wigeon *** 10/4 10/20 11/4 11/20 After Nov 30
Greater White-fronted Goose *** 10/5 10/18 11/5 11/24 After Nov 30
Green-winged Teal *** 10/5 10/20 11/5 After Nov 30 -
Sandhill Crane *** 10/7 10/18 10/31 11/13 After Nov 30

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Greater Yellowlegs * - 8/2 10/27 11/16 After Nov 30
Merlin * 8/19 9/6 10/24 11/8 11/24
American White Pelican ** 8/2 9/8 10/18 After Nov 30 -
Western Meadowlark *** 8/2 9/9 10/15 10/29 11/7
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
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
Eastern Meadowlark *** 9/21 10/1 10/17 11/7 11/19
Sharp-shinned Hawk ** 8/31 10/2 10/17 10/28 After Nov 30
Swamp Sparrow *** 9/21 10/2 10/16 11/2 11/14
Wilson's Snipe ** 8/2 10/3 10/18 11/3 11/16
Savannah Sparrow *** 9/13 10/3 10/15 10/29 11/8
Field Sparrow *** 9/20 10/4 10/18 11/4 11/15
Le Conte's Sparrow *** 9/25 10/4 10/16 10/28 11/7
American Avocet * 9/23 10/5 10/20 11/12 After Nov 30
Brown Creeper ** 9/18 10/5 After Nov 30 - -
American Pipit *** 9/17 10/6 10/24 11/12 After Nov 30

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
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
Common Nighthawk *** 8/15 8/21 8/29 10/1 10/10
White-faced Ibis * - 8/2 9/1 10/2 10/30
Sanderling * 8/2 8/20 9/6 10/7 10/26
Tennessee Warbler * 8/2 8/9 9/9 10/3 10/23
Swainson's Hawk *** - 8/2 9/11 10/14 10/22
House Wren *** 8/25 9/1 9/11 10/6 10/20
Blue-winged Teal *** 8/2 8/10 9/13 10/24 11/10
Great Egret *** - 8/2 9/13 10/20 11/11
Gray Catbird *** 8/2 9/4 9/13 10/1 10/13
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
Northern Flicker *** 9/7 9/16 10/1 11/4 11/13
Chipping Sparrow *** 9/20 9/24 10/1 11/1 11/13
Orange-crowned Warbler *** 9/5 9/21 10/4 10/17 10/28
Common Grackle *** 9/13 9/20 10/6 10/29 After Nov 30

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
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
Tree Swallow ** - - Before Aug 1 9/9 11/1
Marbled Godwit * - 8/2 8/15 9/10 10/2
Forster's Tern ** - 8/2 8/20 9/10 10/19
Black Tern *** - - Before Aug 1 9/12 9/30
Lesser Yellowlegs ** - 8/2 8/20 9/13 11/8
Ovenbird ** 8/13 8/22 9/4 9/18 10/5
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
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
Cattle Egret * - - Before Aug 1 10/1 11/2
Common Nighthawk *** 8/15 8/21 8/29 10/1 10/10
Gray Catbird *** 8/2 9/4 9/13 10/1 10/13
White-faced Ibis * - 8/2 9/1 10/2 10/30
Tennessee Warbler * 8/2 8/9 9/9 10/3 10/23
Mourning Dove *** - 8/2 8/17 10/4 10/25
Summer Tanager *** 9/2 9/10 9/20 10/4 10/14
Snowy Egret ** - 8/2 8/20 10/5 10/26
Broad-winged Hawk *** 9/8 9/15 9/23 10/5 10/12
Osprey *** 8/28 9/9 9/23 10/6 11/11
House Wren *** 8/25 9/1 9/11 10/6 10/20
Sanderling * 8/2 8/20 9/6 10/7 10/26
Northern Rough-winged Swallow ** - - Before Aug 1 10/7 10/23

West

A slow start for the region changes quickly, as favorable migration conditions arrive on Saturday night. This arrival spawns moderate flights in the Pacific Northwest east through portions of the northern and central Rockies. These conditions continue for several days, producing similarly intense flights through Tuesday night. By Wednesday the extent of this movements decreases rather significantly, distributed instead in more western reach of the region. As the period comes to an end, this distribution has light to moderate flights primarily in California and the Desert Southwest. Note that most of the eastern half of the region sees marginal and unfavorable conditions for migration for most of the period, keeping migration light and local.

Greater White-fronted Goose. Jaime Chavez/Macaulay Library. eBird S39346580.

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 -
Golden-crowned Kinglet ** 9/10 10/4 10/23 11/6 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 -
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 - -
Mew Gull ** 10/1 10/22 11/20 After Nov 30 -
Redhead ** 10/3 10/14 11/14 After Nov 30 -
Western Grebe *** 10/3 10/14 11/2 After Nov 30 -
Dunlin *** 10/5 10/15 10/30 After Nov 30 -
Gadwall *** 10/7 10/25 11/17 After Nov 30 -
Surf Scoter *** 10/7 10/21 11/10 11/15 11/18

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
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
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
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 -
Cackling Goose ** 9/16 10/3 After Nov 30 - -
Ruby-crowned Kinglet *** 9/21 10/3 11/5 11/10 11/12
White-throated Sparrow * 9/20 10/3 10/28 11/5 11/10
Golden-crowned Kinglet ** 9/10 10/4 10/23 11/6 11/18
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

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Wandering Tattler * 8/10 8/17 8/26 10/2 10/10
Greater Yellowlegs * 8/11 8/18 8/28 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
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
Yellow Warbler *** - 8/2 9/8 10/2 10/21
Chipping Sparrow *** - 8/2 9/8 10/18 11/2
Pacific-slope Flycatcher ** 8/14 8/25 9/12 10/3 10/17
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
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
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 -
Cooper's Hawk * 8/2 9/7 10/1 10/24 11/11
Townsend's Warbler ** 8/13 8/30 10/2 10/22 11/6
Greater White-fronted Goose * 9/13 9/21 10/3 10/12 10/19
Red-shouldered Hawk * 8/17 9/12 10/3 After Nov 30 -
Black-throated Gray Warbler *** - 8/2 10/4 10/19 10/29
Lincoln's Sparrow ** 8/30 9/11 10/4 10/21 11/5
Red-naped Sapsucker * 9/6 9/19 10/7 10/22 11/3

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
Hermit Warbler * - 8/2 8/19 9/3 10/23
Lesser Yellowlegs ** 8/2 8/15 8/25 9/6 10/7
Western Sandpiper *** 8/2 8/14 8/25 9/6 10/5
Snowy Plover * - - Before Aug 1 9/11 10/1
Black-chinned Hummingbird *** - - Before Aug 1 9/14 10/3
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
Barn Swallow *** 8/2 8/9 8/23 9/17 10/12
Western Wood-Pewee *** - 8/2 8/10 9/20 9/30
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
Parasitic Jaeger * 8/26 9/6 9/19 10/1 10/29
Common Tern ** 8/24 9/6 9/17 10/1 10/11
Wandering Tattler * 8/10 8/17 8/26 10/2 10/10
Black Turnstone * 8/6 8/17 9/21 10/2 After Nov 30
Heermann's Gull * 8/15 9/14 9/21 10/2 After Nov 30
Yellow Warbler *** - 8/2 9/8 10/2 10/21
Killdeer *** 8/2 8/14 9/7 10/3 11/3
Sabine's Gull ** 9/2 9/11 9/21 10/3 10/13
Franklin's Gull * - 8/2 8/31 10/3 11/5
Vaux's Swift ** 8/28 9/5 9/14 10/3 10/20
Pacific-slope Flycatcher *** 8/14 8/25 9/12 10/3 10/17
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 Yellowthroat *** 8/18 8/30 9/15 10/5 10/27

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Farnsworth and Van Doren

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