14-21 August 2015 Regional Migration Forecast: And…they’re off! (and have been for a month)

Continental Summary

Although it’s been over a month of building movements since the earliest migrants began their journeys to non-breeding and wintering locations, this is the first forecast from BirdCast for the Fall 2015 migration season.

A brief pulse of light to moderate flights that will include American Avocet, Marbled Godwit, Western Sandpiper, Western Kingbird, Barn Swallow, Black-headed Grosbeak, and Bullock’s Oriole on either end of the forecast period highlight otherwise unfavorable conditions across the West, while a relatively weak front drifts east mid week bringing light to moderate flights of Osprey, Greater Yellowlegs, Semipalmated Sandpiper, Ruby-throated Hummingbird, Purple Martin, and Tree Swallow first to the northern Plains, then the Great Lakes, and finally the Appalachians and portions of the eastern seaboard.

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 and pre- and post-frontal unsettled weather.

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!

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

The region retains a summer feel for the weekend and early week with warm temperatures and increasing humidity, when primarily light migration will occur. A frontal passage arrives by Tuesday, highlighted by a pulse of more moderate movements on Tuesday and Wednesday nights. By the end of the week, southerly flow returns to most areas, with a possible exception of light to moderate flights in New England to end the week.

Screenshot 2015-08-14 08.47.59

Osprey © Ian Davies

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Bald Eagle ** 7/1 or before 9/2 11/6 - -
Black Tern * 7/1 or before 8/14 8/25 9/12 9/24
Northern Waterthrush ** 7/28 8/24 9/10 9/30 10/12
Ruby-throated Hummingbird *** 7/30 8/14 8/28 9/21 10/5
Northern Harrier ** 8/1 9/26 10/20 11/10 11/27
Cooper's Hawk *** 8/3 9/10 10/7 11/2 11/16
Blue-winged Teal *** 8/4 8/18 9/9 10/22 11/6
Olive-sided Flycatcher * 8/4 8/16 8/30 9/15 9/27
Blue-gray Gnatcatcher *** 8/4 8/14 8/25 9/15 9/29
Mourning Warbler * 8/4 8/15 9/1 9/21 10/7
Prairie Warbler * 8/4 8/21 9/9 9/30 10/13
Eastern Wood-Pewee *** 8/5 8/16 8/29 9/22 10/9
Canada Warbler *** 8/5 8/16 8/30 9/15 9/26
Bobolink ** 8/5 8/16 8/31 9/19 10/15
Baird's Sandpiper ** 8/6 8/17 8/30 9/15 9/25
Wilson's Snipe * 8/6 10/1 10/16 11/2 11/19
Common Nighthawk *** 8/7 8/17 8/31 9/14 9/25
Least Flycatcher *** 8/7 8/18 9/3 9/22 10/5
Green-winged Teal ** 8/8 8/22 10/27 11/22 12/10
Northern Shoveler ** 8/9 10/15 11/10 12/1 12/16
Yellow-bellied Flycatcher ** 8/9 8/20 9/5 9/21 10/4
Red-breasted Nuthatch *** 8/9 9/9 10/2 - -
Buff-breasted Sandpiper ** 8/10 8/20 9/3 9/17 9/28
Black-and-white Warbler *** 8/10 8/28 9/13 10/2 10/14
Blackburnian Warbler *** 8/10 8/23 9/8 9/27 10/9
American Golden-Plover ** 8/11 8/23 9/10 9/27 10/13
Ovenbird *** 8/11 8/26 9/13 10/2 10/14
Golden-winged Warbler * 8/11 8/22 9/7 9/23 10/5
Chestnut-sided Warbler *** 8/11 8/24 9/9 9/27 10/9
Sora * 8/12 8/28 9/21 10/16 10/30
Great Crested Flycatcher ** 8/12 8/17 8/25 9/14 9/26
American Redstart *** 8/12 8/27 9/11 9/30 10/12
Warbling Vireo *** 8/13 8/21 9/3 9/19 9/30
Veery *** 8/13 8/22 9/5 9/22 10/5
Red-eyed Vireo *** 8/15 8/25 9/7 9/28 10/13
Kentucky Warbler * 8/15 8/21 8/31 9/17 9/29
Wilson's Warbler *** 8/15 8/26 9/11 9/28 10/9
Turkey Vulture *** 8/16 9/5 9/28 10/31 11/25
Eastern Whip-poor-will * 8/16 8/21 8/30 9/19 10/2
Yellow-throated Vireo *** 8/16 8/25 9/8 9/26 10/8
Tennessee Warbler *** 8/16 8/30 9/16 10/4 10/18
White-eyed Vireo *** 8/17 8/27 9/10 9/28 10/10
Hooded Warbler * 8/17 8/26 9/9 9/27 10/10
Merlin *** 8/19 9/4 9/28 10/26 11/16
Yellow-throated Warbler * 8/19 8/29 9/12 9/30 10/12
Magnolia Warbler ****! 8/20 9/1 9/17 10/3 10/15

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Osprey *** - 7/1 or before 8/16 10/15 11/8
Greater Yellowlegs *** - 7/1 or before 8/20 9/11 11/28
Lesser Yellowlegs *** - 7/1 or before 8/18 9/10 9/25
Red Knot * - 7/1 or before 8/28 9/15 9/28
Sanderling ** - 7/1 or before 9/1 9/23 10/6
Least Sandpiper *** - 7/1 or before 8/18 9/11 9/25
Forster's Tern ** - 7/1 or before 8/17 9/18 11/30
Cedar Waxwing * - 7/1 or before 8/17 9/27 11/26
Wood Duck *** 7/1 or before 7/6 8/18 10/31 11/21
Semipalmated Sandpiper *** 7/1 7/13 8/16 9/10 9/28
Stilt Sandpiper ** 7/1 or before 7/15 8/21 9/11 9/25
Western Sandpiper * 7/1 or before 7/15 8/24 9/17 10/1
Caspian Tern ** 7/1 or before 7/17 8/20 9/14 10/20
Pectoral Sandpiper ** 7/1 or before 7/18 8/16 9/24 11/20
Semipalmated Plover *** 7/1 7/25 8/17 9/8 10/4
Belted Kingfisher ** 7/1 or before 7/27 9/20 10/14 -
Royal Tern * 7/12 7/31 8/25 11/10 11/25
Black-bellied Plover *** 7/20 8/1 8/20 9/3 12/1
Marbled Godwit * 7/22 8/2 8/20 9/5 9/21
White-rumped Sandpiper * 7/22 8/6 8/26 9/13 9/28
Wilson's Phalarope * 7/1 or before 8/7 8/22 9/10 9/22
Baltimore Oriole *** 7/29 8/7 8/19 9/6 9/18
Red-necked Phalarope * 7/28 8/11 8/27 9/13 9/27
Worm-eating Warbler * 8/1 8/11 8/25 9/12 9/24
Blue-winged Warbler * 8/1 8/13 8/28 9/14 9/27
Prothonotary Warbler * 8/7 8/13 8/21 9/10 9/22
Black Tern * 7/1 or before 8/14 8/25 9/12 9/24
Ruby-throated Hummingbird *** 7/30 8/14 8/28 9/21 10/5
Blue-gray Gnatcatcher ** 8/4 8/14 8/25 9/15 9/29
Mourning Warbler * 8/4 8/15 9/1 9/21 10/7
Olive-sided Flycatcher * 8/4 8/16 8/30 9/15 9/27
Eastern Wood-Pewee *** 8/5 8/16 8/29 9/22 10/9
Canada Warbler ** 8/5 8/16 8/30 9/15 9/26
Bobolink ** 8/5 8/16 8/31 9/19 10/15
Baird's Sandpiper ** 8/6 8/17 8/30 9/15 9/25
Common Nighthawk *** 8/7 8/17 8/31 9/14 9/25
Great Crested Flycatcher * 8/12 8/17 8/25 9/14 9/26
Blue-winged Teal ** 8/4 8/18 9/9 10/22 11/6
Least Flycatcher ** 8/7 8/18 9/3 9/22 10/5
Buff-breasted Sandpiper * 8/10 8/20 9/3 9/17 9/28
Yellow-bellied Flycatcher * 8/9 8/20 9/5 9/21 10/4
Eastern Whip-poor-will * 8/16 8/21 8/30 9/19 10/2
Warbling Vireo *** 8/13 8/21 9/3 9/19 9/30
Kentucky Warbler * 8/15 8/21 8/31 9/17 9/29
Prairie Warbler * 8/4 8/21 9/9 9/30 10/13

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Mississippi Kite * - - 7/1 or before 9/4 9/18
Yellow-billed Cuckoo * - - 7/1 or before 10/3 10/17
Tree Swallow *** - - 7/1 or before 8/30 11/10
Cliff Swallow * - - 7/1 or before 8/29 9/18
Yellow Warbler *** - - 7/1 or before 8/18 10/7
Roseate Tern * - 7/1 or before 7/20 9/1 9/23
Willet * - 7/1 or before 7/21 9/6 9/21
Glossy Ibis * - 7/1 or before 7/23 8/17 9/26
Least Tern ** - 7/1 or before 7/23 8/15 9/7
Black Skimmer * - 7/1 or before 7/23 9/22 10/21
Piping Plover * - 7/1 or before 7/25 8/17 9/10
Common Gallinule * - 7/1 or before 7/26 9/12 11/2
Purple Martin *** - 7/1 or before 7/26 8/19 9/8
Black-necked Stilt * - 7/1 or before 7/28 9/4 9/19
Short-billed Dowitcher ** - 7/1 or before 7/29 9/10 9/23
American Oystercatcher * - 7/1 or before 7/29 8/30 9/25
Gull-billed Tern * - 7/1 or before 7/30 8/20 9/4
Black-crowned Night-Heron * - 7/1 or before 7/31 8/27 10/30
Whimbrel * 7/1 or before 7/9 8/1 9/18 10/4
Common Tern ** - 7/1 or before 8/1 8/26 10/4
Bank Swallow ** - 7/1 or before 8/1 8/28 9/15
Clapper Rail * - 7/1 or before 8/1 8/28 10/29
Killdeer *** - 7/1 or before 8/2 10/28 11/26
Eastern Kingbird *** - - 8/2 8/27 9/12
Yellow-crowned Night-Heron * - 7/1 or before 8/3 10/8 10/28
Barn Swallow *** 7/1 or before 7/22 8/4 8/30 9/16
Chimney Swift *** - - 8/5 10/10 10/25
Blue Grosbeak * 7/1 or before 7/18 8/5 8/31 10/17
Spotted Sandpiper *** 7/1 or before 7/1 8/6 9/5 9/24
Snowy Egret ** - 7/1 or before 8/7 10/15 11/3
Little Blue Heron * 7/1 or before 7/21 8/9 8/26 10/20
Great Blue Heron *** - 7/1 or before 8/10 10/19 12/8
Tricolored Heron * 7/14 7/26 8/11 10/7 10/22
Upland Sandpiper * 7/26 8/1 8/11 8/29 9/12
Great Egret *** 7/1 or before 7/11 8/12 10/19 11/6
Ruddy Turnstone ** 7/1 or before 7/25 8/12 8/29 9/17
Green Heron *** - 7/1 or before 8/13 9/15 10/7
Solitary Sandpiper ** 7/1 or before 7/11 8/13 9/8 10/7
Laughing Gull ** 7/1 or before 7/15 8/13 11/12 12/5
Osprey *** - 7/1 or before 8/16 10/15 11/8
Pectoral Sandpiper ** 7/1 or before 7/18 8/16 9/24 11/20
Semipalmated Sandpiper *** 7/1 7/13 8/16 9/10 9/28
Semipalmated Plover *** 7/1 7/25 8/17 9/8 10/4
Forster's Tern * - 7/1 or before 8/17 9/18 11/30
Cedar Waxwing *** - 7/1 or before 8/17 9/27 11/26
Wood Duck ** 7/1 or before 7/6 8/18 10/31 11/21
Lesser Yellowlegs *** - 7/1 or before 8/18 9/10 9/25
Least Sandpiper *** - 7/1 or before 8/18 9/11 9/25
Baltimore Oriole *** 7/29 8/7 8/19 9/6 9/18
Black-bellied Plover * 7/20 8/1 8/20 9/3 12/1
Greater Yellowlegs ** - 7/1 or before 8/20 9/11 11/28
Marbled Godwit * 7/22 8/2 8/20 9/5 9/21
Caspian Tern ** 7/1 or before 7/17 8/20 9/14 10/20
Stilt Sandpiper * 7/1 or before 7/15 8/21 9/11 9/25
Prothonotary Warbler * 8/7 8/13 8/21 9/10 9/22

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Arctic Tern * - 7/1 or before 7/12 8/4 8/19
Willow Flycatcher *** - 7/1 or before 7/18 8/4 8/17
Northern Rough-winged Swallow ** - - 7/1 or before 8/5 10/24
Wilson's Storm-Petrel * - 7/1 or before 7/21 8/6 9/22
Orchard Oriole *** - - 7/1 or before 8/7 9/5
Louisiana Waterthrush * - - 7/1 or before 8/9 8/31
Alder Flycatcher * - 7/1 or before 7/20 8/11 8/26
Least Bittern * - 7/1 or before 7/17 8/12 9/3
Least Tern ** - 7/1 or before 7/23 8/15 9/7
Glossy Ibis * - 7/1 or before 7/23 8/17 9/26
Piping Plover * - 7/1 or before 7/25 8/17 9/10
Yellow Warbler *** - - 7/1 or before 8/18 10/7
Purple Martin *** - 7/1 or before 7/26 8/19 9/8
Gull-billed Tern * - 7/1 or before 7/30 8/20 9/4

Gulf Coast and Southeast

Generally unfavorable or marginal conditions prevail for the period across the region. Small pockets of more favorable conditions start the weekend, bringing light to locally moderate flights of departing migrants. As the forecast period progresses, some higher elevations of the Appalachians will experience light movements, as well. However, scattered precipitation and generally warm and humid conditions will keep most flights sparse and low density.

Screenshot 2015-08-14 08.48.31

Solitary Sandpiper © Ian Davies

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Prairie Warbler ** 7/23 9/8 9/23 10/13 10/30
Ruby-throated Hummingbird *** 7/26 8/30 9/13 10/5 10/20
Great Blue Heron ** 7/27 10/21 11/19 - -
Cooper's Hawk ** 7/29 9/11 10/24 11/11 11/22
Yellow Warbler *** 7/29 8/16 9/7 9/29 10/15
Buff-breasted Sandpiper * 7/31 8/14 8/30 9/17 9/30
Yellow-throated Warbler ** 7/31 9/6 9/26 10/19 11/4
Hooded Warbler ** 8/3 9/3 9/20 10/11 10/27
Alder Flycatcher * 8/4 8/17 9/3 9/20 10/4
Blue-gray Gnatcatcher *** 8/4 8/25 9/13 10/1 10/14
Kentucky Warbler * 8/4 8/15 9/2 9/24 10/9
Willow Flycatcher * 8/5 8/19 9/5 9/25 10/9
Bank Swallow ** 8/6 8/17 9/1 9/16 9/28
Olive-sided Flycatcher ** 8/6 8/19 9/5 9/23 10/7
Northern Parula *** 8/7 9/3 9/23 10/17 11/2
Bell's Vireo * 8/8 8/18 8/29 9/23 10/10
Blue-winged Teal *** 8/8 8/25 11/2 - -
White-rumped Sandpiper * 8/8 8/20 9/5 9/22 10/5
Worm-eating Warbler ** 8/9 8/29 9/15 10/4 10/17
American Golden-Plover * 8/10 8/21 9/5 9/20 10/1
Common Nighthawk * 8/10 8/18 8/28 9/19 10/4
Dickcissel * 8/10 8/19 9/2 9/24 10/16
Great Crested Flycatcher *** 8/11 8/20 9/1 9/20 10/5
Belted Kingfisher *** 8/12 9/14 10/26 - -
Bullock's Oriole * 8/13 8/21 9/2 9/18 9/30
Canada Warbler ** 8/13 8/24 9/9 9/26 10/9
Pine Warbler *** 8/13 9/6 10/3 - -
Yellow-breasted Chat ** 8/13 8/23 9/7 9/25 10/9
Swainson's Warbler * 8/14 8/25 9/13 10/5 10/24
Chuck-will's-widow * 8/15 8/31 9/17 10/6 10/20
Least Flycatcher ** 8/15 8/30 9/14 10/1 10/13
Mourning Warbler ** 8/15 8/27 9/12 9/28 10/10
Yellow-bellied Flycatcher * 8/15 8/31 9/15 10/3 10/15
Brown-crested Flycatcher * 8/16 8/23 9/1 9/20 10/2
Eastern Wood-Pewee *** 8/16 9/1 9/19 10/12 10/29
Yellow-throated Vireo *** 8/16 8/30 9/15 10/3 10/17
Black-billed Cuckoo * 8/17 9/5 9/26 10/18 11/1
Baltimore Oriole *** 8/18 8/30 9/14 9/30 10/10
Black-and-white Warbler *** 8/18 9/6 9/26 10/18 11/5
Blue-winged Warbler ** 8/19 9/1 9/17 10/4 10/16
Northern Waterthrush *** 8/19 9/3 9/19 10/7 10/21
Summer Tanager *** 8/19 8/31 9/15 10/4 10/19
White-eyed Vireo *** 8/19 9/3 9/20 10/11 10/30
Acadian Flycatcher ** 8/20 9/1 9/16 10/5 10/18
Bald Eagle ** 8/21 9/18 After Dec 31 - -
Bobolink ** 8/21 9/4 9/21 10/9 10/23

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Solitary Sandpiper ** - 7/1 or before 8/17 9/13 10/5
Short-billed Dowitcher * 7/1 or before 7/3 8/27 9/14 9/25
Least Sandpiper *** 7/1 or before 7/9 8/25 9/18 -
Western Sandpiper ** 7/1 or before 7/11 9/1 9/20 10/2
Semipalmated Sandpiper *** 7/1 or before 7/15 8/23 9/16 10/15
Piping Plover * 7/1 or before 7/16 9/1 - -
Spotted Sandpiper *** 7/1 or before 7/19 8/17 9/12 10/3
Common Tern * 7/1 or before 7/20 8/22 9/24 11/9
Stilt Sandpiper * 7/5 7/21 8/15 9/14 11/21
Pectoral Sandpiper ** 7/1 or before 7/26 8/18 9/22 10/8
Wilson's Plover * 7/1 or before 7/27 8/15 9/8 9/26
Baird's Sandpiper * 7/8 7/28 8/20 9/24 10/9
Sanderling *** 7/9 7/28 8/19 - -
Sandwich Tern * 7/1 or before 7/28 8/19 9/8 12/9
Ruddy Turnstone *** 7/19 7/30 8/17 - -
Semipalmated Plover ** 7/14 7/30 8/21 9/10 10/2
Wilson's Phalarope * 7/19 8/2 8/22 9/12 10/3
Upland Sandpiper ** 7/21 8/3 8/20 9/8 9/23
Black-bellied Plover * 7/23 8/6 11/2 - -
Black Tern ** 7/20 8/8 8/24 9/13 9/27
Prothonotary Warbler * 8/2 8/11 8/28 9/23 10/9
Caspian Tern * 7/26 8/13 10/26 11/23 -
Cerulean Warbler * 8/1 8/13 8/28 9/14 9/26
Buff-breasted Sandpiper * 7/31 8/14 8/30 9/17 9/30
Kentucky Warbler * 8/4 8/15 9/2 9/24 10/9
Yellow Warbler *** 7/29 8/16 9/7 9/29 10/15
Alder Flycatcher * 8/4 8/17 9/3 9/20 10/4
Bank Swallow ** 8/6 8/17 9/1 9/16 9/28
Bell's Vireo * 8/8 8/18 8/29 9/23 10/10
Common Nighthawk * 8/10 8/18 8/28 9/19 10/4
Dickcissel * 8/10 8/19 9/2 9/24 10/16
Olive-sided Flycatcher * 8/6 8/19 9/5 9/23 10/7
Willow Flycatcher * 8/5 8/19 9/5 9/25 10/9
Great Crested Flycatcher *** 8/11 8/20 9/1 9/20 10/5
White-rumped Sandpiper * 8/8 8/20 9/5 9/22 10/5
American Golden-Plover * 8/10 8/21 9/5 9/20 10/1
Bullock's Oriole * 8/13 8/21 9/2 9/18 9/30

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Black-chinned Hummingbird * - - 7/1 or before 9/20 10/10
Blue Grosbeak * - - 7/1 or before 8/26 11/1
Cassin's Sparrow * - - 7/1 or before 8/19 9/15
Green Heron ** - - 7/1 or before 9/20 10/9
Louisiana Waterthrush * - - 7/1 or before 9/11 9/29
Swallow-tailed Kite * - - 7/1 or before 8/15 8/31
Yellow-crowned Night-Heron * - - 7/1 or before 9/24 10/21
Eastern Kingbird ** - - 7/4 9/21 10/7
Least Tern ** - 7/1 or before 7/21 9/5 9/21
Gull-billed Tern * - 7/1 or before 7/23 9/7 9/29
Black Skimmer * - 7/1 or before 8/6 9/4 9/18
Black-bellied Whistling-Duck * - 7/1 or before 8/6 9/21 12/6
Barn Swallow *** - 7/1 or before 8/8 9/8 11/5
Mississippi Kite *** - - 8/8 8/28 9/12
Whimbrel * 7/8 7/24 8/9 8/24 9/4
Black-necked Stilt ** 7/14 7/27 8/11 9/16 11/28
Cattle Egret ** - - 8/12 9/25 -
Orchard Oriole ** - - 8/13 9/12 9/30
Gray Kingbird * - - 8/14 9/16 10/11
Stilt Sandpiper * 7/5 7/21 8/15 9/14 11/21
Wilson's Plover * 7/1 or before 7/27 8/15 9/8 9/26
Solitary Sandpiper ** - 7/1 or before 8/17 9/13 10/5
Spotted Sandpiper ** 7/1 or before 7/19 8/17 9/12 10/3
Black-headed Grosbeak * - - 8/18 9/8 9/23
Pectoral Sandpiper ** 7/1 or before 7/26 8/18 9/22 10/8
Sandwich Tern * 7/1 or before 7/28 8/19 9/8 12/9
Baird's Sandpiper * 7/8 7/28 8/20 9/24 10/9
Upland Sandpiper ** 7/21 8/3 8/20 9/8 9/23
Semipalmated Plover ** 7/14 7/30 8/21 9/10 10/2

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Cliff Swallow ** - - 7/1 or before 7/8 10/7
Purple Martin *** - - 7/1 or before 7/19 9/5
Least Bittern * - - 7/1 or before 8/1 10/18
Bachman's Sparrow * - - 7/1 or before 8/4 9/5
Western Kingbird ** - - 7/1 or before 8/7 9/7
Swallow-tailed Kite ** - - 7/1 or before 8/15 8/31
Cassin's Sparrow * - - 7/1 or before 8/19 9/15

Great Plains

A cold front pushes across the northern Plains by Sunday, bringing a pulse of light and moderate and even locally heavy migration to the Dakotas. But Sunday and Monday nights see the only action, as the front’s passage out of the region bring unfavorable southerly flow and a return of warmer temperatures. This pattern of flow holds sway for most of the remainder of the period, until Thursday night or Friday when the next disturbance organizes sufficiently and moves into the region. This system may bring a late week pulse of light to moderate movements to the northern Plains, and it is worth noting that its passage may have significant enough precipitation to drop shorebirds and other high flying migrants into local water bodies and water courses (among other species concentrations that are possible).

Screenshot 2015-08-14 08.50.06

Lesser Yellowlegs © Ian Davies

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Caspian Tern * 7/1 or before 8/15 9/11 9/30 10/13
Red-necked Phalarope * 7/1 or before 8/25 9/9 9/30 10/14
White-faced Ibis * 7/1 or before 8/14 9/4 10/1 10/27
Ring-billed Gull *** 7/16 10/23 11/10 11/29 -
Swainson's Hawk ** 7/28 8/21 9/7 10/4 10/21
Blue-gray Gnatcatcher ** 8/2 8/15 8/27 9/21 10/5
Blue-winged Teal *** 8/2 8/18 9/18 10/25 11/13
Blackburnian Warbler * 8/3 8/15 8/30 9/15 9/27
American Golden-Plover * 8/6 9/3 9/27 10/23 11/19
Baltimore Oriole *** 8/6 8/14 8/26 9/12 9/23
Canada Warbler ** 8/6 8/17 8/30 9/14 9/24
Yellow-bellied Flycatcher * 8/6 8/17 9/1 9/17 9/28
Northern Waterthrush ** 8/7 8/17 8/31 9/15 9/25
Tennessee Warbler ** 8/7 8/22 9/10 9/30 10/16
Wilson's Snipe * 8/7 10/3 10/18 11/4 11/16
Cooper's Hawk *** 8/8 9/2 9/25 10/20 11/10
Least Flycatcher *** 8/8 8/19 9/3 9/20 10/3
Olive-sided Flycatcher *** 8/9 8/19 9/2 9/18 9/29
American Redstart *** 8/10 8/20 9/3 9/20 10/2
Black-and-white Warbler *** 8/10 8/20 9/4 9/20 10/3
Mourning Warbler ** 8/10 8/20 9/3 9/18 9/29
Ovenbird ** 8/10 8/20 9/4 9/20 10/2
Warbling Vireo NA 8/10 9/6 9/12 9/21 10/3
Chestnut-sided Warbler ** 8/11 8/21 9/5 9/20 10/2
Great Crested Flycatcher ** 8/11 8/17 8/25 9/15 9/27
Red-eyed Vireo *** 8/11 8/19 8/31 9/19 10/2
Red-shouldered Hawk * 8/11 9/5 9/30 10/26 -
Yellow-throated Vireo ** 8/11 8/20 9/2 9/20 10/2
Rose-breasted Grosbeak ** 8/12 8/22 9/4 9/25 10/10
Say's Phoebe * 8/12 8/25 9/7 9/28 10/11
Magnolia Warbler ** 8/13 8/24 9/9 9/25 10/7
Blackpoll Warbler * 8/15 8/27 9/11 9/27 10/8
Philadelphia Vireo ** 8/15 8/27 9/12 9/29 10/10
Yellow-headed Blackbird NA 8/15 9/5 9/15 9/30 10/12
Merlin * 8/16 9/6 10/26 - -
Black-throated Green Warbler * 8/17 9/1 9/19 10/7 10/22
Northern Parula ** 8/17 8/27 9/11 9/29 10/11
Gray Catbird *** 8/18 8/30 9/11 10/1 10/14
Sora * 8/18 9/6 9/29 10/22 11/5
Swainson's Thrush *** 8/18 8/30 9/13 9/29 10/10
Blue-headed Vireo *** 8/19 9/1 9/18 10/5 10/18
Brown Thrasher *** 8/19 8/30 9/11 9/30 10/12
Western Tanager * 8/19 8/29 9/11 9/28 10/9
White-eyed Vireo * 8/19 8/28 9/10 9/29 10/11
Clay-colored Sparrow *** 8/20 9/3 9/24 10/16 10/31
Turkey Vulture *** 8/20 9/8 9/22 10/16 10/30
Yellow-breasted Chat * 8/20 8/26 9/4 9/24 10/8

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Lesser Yellowlegs ** - 7/1 or before 8/21 9/18 11/15
Wilson's Phalarope * - 7/1 or before 8/21 9/15 10/2
Wood Duck ** 7/1 or before 7/1 or before 8/19 10/27 11/19
Black Tern *** 7/1 or before 7/5 8/17 9/14 10/2
Snowy Egret ** 7/1 or before 7/5 8/18 10/2 10/24
Solitary Sandpiper *** 7/1 or before 7/6 8/16 9/12 9/28
Stilt Sandpiper ** 7/1 or before 7/8 8/26 9/15 9/30
Least Sandpiper *** - 7/10 8/26 9/16 9/30
Little Blue Heron * - 7/10 8/24 9/16 10/2
Great Egret *** - 7/15 9/11 10/16 11/10
Semipalmated Sandpiper *** 7/1 7/15 8/15 9/14 10/3
Semipalmated Plover ** 7/1 7/21 8/19 9/17 10/11
Forster's Tern ** 7/1 or before 7/26 8/20 9/15 10/26
Peregrine Falcon * 7/1 or before 7/26 9/19 10/10 10/28
Sanderling * 7/1 7/28 9/10 10/3 10/21
Ruby-throated Hummingbird *** 7/1 or before 7/29 8/28 9/21 10/8
Black-bellied Plover * 7/20 7/30 9/29 11/15 11/28
Greater Yellowlegs * - 8/1 10/26 11/13 11/25
Mississippi Kite * 7/1 or before 8/1 8/18 9/10 9/23
Buff-breasted Sandpiper * 7/23 8/3 8/21 9/12 9/29
Eastern Wood-Pewee ** 7/1 or before 8/5 8/22 9/19 10/6
Alder Flycatcher * 7/26 8/7 8/23 9/9 9/21
Bell's Vireo * 8/5 8/11 8/20 9/11 9/24
Yellow Warbler *** 8/1 8/12 8/26 9/17 10/1
Red-headed Woodpecker ** 7/31 8/13 8/27 9/23 10/13
Baltimore Oriole *** 8/6 8/14 8/26 9/12 9/23
White-faced Ibis * 7/1 or before 8/14 9/4 10/1 10/27
Blackburnian Warbler * 8/3 8/15 8/30 9/15 9/27
Blue-gray Gnatcatcher ** 8/2 8/15 8/27 9/21 10/5
Caspian Tern * 7/1 8/15 9/11 9/30 10/13
Canada Warbler * 8/6 8/17 8/30 9/14 9/24
Great Crested Flycatcher ** 8/11 8/17 8/25 9/15 9/27
Northern Waterthrush ** 8/7 8/17 8/31 9/15 9/25
Yellow-bellied Flycatcher * 8/6 8/17 9/1 9/17 9/28
Blue-winged Teal *** 8/2 8/18 9/18 10/25 11/13
Least Flycatcher *** 8/8 8/19 9/3 9/20 10/3
Olive-sided Flycatcher *** 8/9 8/19 9/2 9/18 9/29
Red-eyed Vireo *** 8/11 8/19 8/31 9/19 10/2
American Redstart *** 8/10 8/20 9/3 9/20 10/2
Black-and-white Warbler *** 8/10 8/20 9/4 9/20 10/3
Mourning Warbler * 8/10 8/20 9/3 9/18 9/29
Ovenbird ** 8/10 8/20 9/4 9/20 10/2
Yellow-throated Vireo * 8/11 8/20 9/2 9/20 10/2
Chestnut-sided Warbler * 8/11 8/21 9/5 9/20 10/2
Swainson's Hawk ** 7/28 8/21 9/7 10/4 10/21

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Cliff Swallow *** - - 7/1 or before 9/2 9/25
Lark Sparrow *** - - 7/1 or before 9/10 9/28
Least Bittern * - - 7/1 or before 8/25 9/30
Marbled Godwit * - - 7/1 or before 9/8 10/2
Prothonotary Warbler * - - 7/1 or before 8/30 9/24
Snowy Plover * - - 7/1 or before 9/12 10/3
Tree Swallow ** - - 7/1 or before 9/4 11/8
Willet * - - 7/1 or before 9/8 10/5
Yellow-billed Cuckoo ** - - 7/1 or before 8/22 10/4
Western Wood-Pewee * - 7/1 or before 7/20 9/17 9/29
Purple Martin *** - 7/2 7/23 8/20 9/9
Least Tern * - - 7/26 8/20 9/13
Yellow-crowned Night-Heron * - 7/1 or before 7/31 8/26 10/5
Killdeer *** 7/1 or before 7/4 8/2 11/3 11/28
Cattle Egret * - - 8/5 9/30 11/3
Upland Sandpiper *** 7/23 7/29 8/6 8/27 9/10
Black-necked Stilt * - - 8/7 9/17 10/4
Eastern Kingbird *** 7/1 or before 7/25 8/7 9/6 9/22
Short-billed Dowitcher * 7/1 or before 7/6 8/7 9/2 10/4
Spotted Sandpiper *** 7/1 or before 7/6 8/7 9/12 10/1
Blue Grosbeak *** 7/27 8/1 8/9 8/27 9/11
Chimney Swift *** - 7/25 8/10 10/10 10/25
Pectoral Sandpiper ** 7/1 or before 7/20 8/10 8/26 10/20
Green Heron ** 7/1 or before 7/2 8/11 9/18 10/10
Bank Swallow ** 7/1 or before 7/5 8/12 9/13 9/29
Baird's Sandpiper ** ]+D11 7/10 8/13 9/11 10/3
Semipalmated Sandpiper ** 7/1 7/15 8/15 9/14 10/3
Solitary Sandpiper *** 7/1 or before 7/6 8/16 9/12 9/28
Black Tern *** 7/1 or before 7/5 8/17 9/14 10/2
Lark Bunting ** - - 8/17 9/13 9/30
Mississippi Kite *** 7/1 or before 8/1 8/18 9/10 9/23
Snowy Egret ** 7/1 or before 7/5 8/18 10/2 10/24
Semipalmated Plover * 7/1 7/21 8/19 9/17 10/11
Wood Duck ** 7/1 or before 7/1 8/19 10/27 11/19
Bell's Vireo *** 8/5 8/11 8/20 9/11 9/24
Forster's Tern ** 7/1 or before 7/26 8/20 9/15 10/26
Buff-breasted Sandpiper * 7/23 8/3 8/21 9/12 9/29
Lesser Yellowlegs ** - 7/1 or before 8/21 9/18 11/15
Wilson's Phalarope ** - 7/1 or before 8/21 9/15 10/2

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Dickcissel *** - - 7/1 or before 7/3 9/10
Northern Rough-winged Swallow ** - - 7/1 or before 7/15 10/19
Louisiana Waterthrush * - - 7/1 or before 7/25 9/1
Orchard Oriole *** - - 7/1 or before 7/29 9/9
Painted Bunting *** - - 7/9 8/2 8/16
Violet-green Swallow ** 7/1 or before 7/7 7/19 8/4 8/16
Western Kingbird *** - 7/1 or before 7/17 8/11 9/16
Piping Plover * - - 7/26 8/12 9/24
Least Tern * - - 7/26 8/20 9/13
Purple Martin *** - 7/2 7/23 8/20 9/9

West

A burst of favorable conditions, particularly in the northern reaches of the region, kick off the weekend, with light to moderate movements peaking in the northern Rockies and portions of the Pacific Northwest on Sunday night. A period of generally unfavorable conditions for migration follow, with southerly winds and warm temperatures slowing movements to a stand still in most places. Wednesday night sees another pulse of light to moderate movements, this time west of the continental divide in the Pacific Northwest. A wider area of the favorable conditions associated with those movements comes on Thursday night, bringing another light to moderate pulse of migration to a slightly wider array of locations in the Pacific Northwest, Great Basin, and northern Rockies.

American Avocet © Ian Davies

American Avocet © Ian Davies

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
American White Pelican * 7/1 or before 8/17 9/1 9/26 12/11
Black Storm-Petrel * 7/1 or before 8/21 9/6 10/21 11/1
Ring-billed Gull ** 7/1 or before 11/2 11/22 12/5 -
Ashy Storm-Petrel * 7/1 or before 8/18 9/11 10/8 10/26
Pink-footed Shearwater * 7/1 or before 8/15 9/15 10/19 11/12
Sooty Shearwater * 7/1 or before 8/28 9/12 10/2 10/16
Long-tailed Jaeger * 7/19 8/29 9/12 10/1 10/13
Pomarine Jaeger * 7/20 8/30 9/25 10/22 11/14
South Polar Skua * 7/26 9/10 9/25 10/15 10/30
Pied-billed Grebe ** 7/27 10/18 11/11 11/29 -
Ruff * 7/27 8/26 9/10 9/27 10/9
Buller's Shearwater * 7/28 8/21 9/21 10/22 11/15
Cinnamon Teal * 7/31 8/16 9/5 9/28 10/14
Cooper's Hawk * 8/1 9/7 10/1 11/2 11/19
Nashville Warbler ** 8/2 8/16 9/4 9/23 10/12
Red-necked Phalarope *** 8/2 8/16 9/1 9/19 10/5
Sora * 8/3 8/23 9/22 - -
Virginia's Warbler * 8/3 8/14 8/27 9/17 10/2
Killdeer *** 8/4 8/19 9/8 9/30 11/20
Osprey ** 8/4 8/14 8/26 9/16 10/18
Northern Shoveler *** 8/5 8/20 11/22 - -
Yellow Warbler *** 8/5 8/19 9/8 10/3 10/21
Blue-winged Teal * 8/6 8/21 9/28 10/24 11/8
Brewer's Sparrow ** 8/6 8/21 9/8 9/28 10/11
Chipping Sparrow ** 8/7 8/20 9/8 10/11 11/5
Green-winged Teal *** 8/7 8/20 11/21 - -
MacGillivray's Warbler *** 8/8 8/19 9/4 9/23 10/7
Red-headed Woodpecker * 8/8 8/18 8/31 9/15 9/26
Wilson's Warbler *** 8/8 8/22 9/8 9/28 10/12
Blue-gray Gnatcatcher * 8/9 8/24 9/12 9/30 10/13
Buff-breasted Sandpiper * 8/9 8/19 9/2 9/16 9/26
Gray Flycatcher * 8/9 8/22 9/5 9/25 10/7
Northern Pintail *** 8/9 8/22 11/19 - -
Northern Waterthrush * 8/9 8/20 9/4 9/19 10/3
Willow Flycatcher *** 8/9 8/20 9/3 9/23 10/7
Black-and-white Warbler * 8/10 8/27 10/5 10/31 11/17
Gray Catbird * 8/10 8/19 8/31 9/19 10/2
American Redstart * 8/11 8/23 9/10 9/27 10/11
Cassin's Vireo * 8/11 8/22 9/6 9/25 10/8
Least Flycatcher * 8/11 8/21 9/6 9/24 10/8
Red-eyed Vireo * 8/11 8/19 8/30 9/17 9/29
Brown Thrasher * 8/12 8/21 9/5 9/21 10/6
Northern Harrier ** 8/12 10/29 11/20 - -
Orange-crowned Warbler *** 8/12 9/2 9/22 10/12 10/29
Townsend's Warbler *** 8/12 8/30 9/30 10/27 11/10
Yellow-headed Blackbird * 8/12 8/21 9/2 9/24 10/11
Hammond's Flycatcher * 8/13 8/22 9/6 9/24 10/7
Savannah Sparrow *** 8/13 8/29 9/27 10/21 11/9
Clay-colored Sparrow * 8/14 8/28 9/17 10/6 11/2
House Wren ** 8/14 8/24 9/9 9/29 11/8
Warbling Vireo *** 8/14 8/25 9/9 9/29 10/13
Belted Kingfisher *** 8/15 9/5 10/27 11/10 -
Sabine's Gull * 8/15 9/4 9/21 10/6 10/17
Western Tanager *** 8/15 8/25 9/7 9/28 10/12
Common Yellowthroat *** 8/17 8/29 9/16 10/9 10/28
Pectoral Sandpiper ** 8/17 9/1 9/20 10/11 10/28
Vesper Sparrow ** 8/17 8/30 9/15 10/3 10/17
Red-tailed Hawk *** 8/18 9/12 After Dec 31 - -
Marsh Wren ** 8/19 9/27 10/30 11/21 -
Red-shouldered Hawk ** 8/19 9/6 10/3 10/23 -
Common Tern * 8/19 9/1 9/16 10/3 10/16
Pacific-slope Flycatcher ** 8/19 8/28 9/12 10/4 10/20
Swainson's Thrush *** 8/19 8/26 9/8 9/24 10/10
Black Phoebe *** 8/20 9/6 10/30 - -
Green-tailed Towhee ** 8/21 9/1 9/14 10/1 10/12
Parasitic Jaeger * 8/21 9/4 9/20 10/8 10/22
Prairie Warbler * 8/21 9/3 9/19 10/5 10/17

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
American Avocet * - 7/1 or before 8/31 9/28 10/20
Heermann's Gull * - 7/1 or before 9/16 10/7 12/1
Marbled Godwit * - 7/1 or before 9/2 - -
Mourning Dove * - 7/1 or before 8/17 9/22 10/8
Bank Swallow * - 7/1 or before 8/18 9/12 9/28
Barn Swallow *** - 7/1 or before 8/23 9/25 10/12
Black-necked Stilt * 7/1 or before 7/1 or before 8/22 9/18 10/7
Franklin's Gull * 7/1 or before 7/1 or before 9/3 10/3 11/1
Green Heron * - 7/1 or before 8/30 9/23 10/18
Spotted Sandpiper ** 7/1 or before 7/3 8/21 9/19 10/4
Short-billed Dowitcher * 7/1 or before 7/4 8/28 9/13 9/24
White-faced Ibis * 7/1 or before 7/4 8/26 9/25 10/16
Western Sandpiper *** 7/1 or before 7/8 8/29 9/15 10/6
Greater Yellowlegs *** 7/1 or before 7/10 8/30 9/14 12/11
Ruddy Turnstone * 7/1 or before 7/13 8/21 9/8 12/5
Semipalmated Plover *** 7/1 or before 7/13 8/26 9/14 9/28
California Gull * 7/1 or before 7/14 11/9 11/26 12/10
Least Sandpiper *** 7/1 or before 7/15 8/28 9/13 9/25
Stilt Sandpiper * 7/1 or before 7/17 8/31 9/15 9/27
Surfbird * 7/1 or before 7/17 9/1 - -
Sanderling * 7/1 or before 7/18 9/11 - -
Black Turnstone * 7/3 7/19 9/14 11/26 12/7
Wandering Tattler * 7/1 or before 7/20 8/24 9/24 10/16
Black-footed Albatross * 7/1 or before 7/21 9/12 10/11 11/5
Elegant Tern * 7/1 or before 7/21 9/15 10/5 11/26
Black-bellied Plover * 7/1 or before 7/23 10/8 - -
Black Tern * 7/1 or before 7/24 8/15 9/24 10/8
Swainson's Hawk * - 7/26 8/14 9/27 10/13
Fork-tailed Storm-Petrel * 7/16 7/30 8/23 10/7 10/23
Semipalmated Sandpiper * 7/1 or before 7/31 8/19 9/9 9/22
Lark Sparrow * 7/21 8/1 8/19 9/19 10/5
Upland Sandpiper * 7/26 8/2 8/14 8/29 9/10
Lark Bunting * 7/25 8/4 8/21 9/9 9/26
Hermit Warbler * 7/28 8/6 8/22 9/7 10/26
Arctic Tern * 7/18 8/8 9/5 9/30 10/17
Lesser Yellowlegs ** 7/1 or before 8/9 8/26 9/14 10/20
Red-breasted Nuthatch ** 7/29 8/10 9/2 10/28 11/14
Lazuli Bunting * 8/5 8/11 8/20 9/17 10/10
Solitary Sandpiper * 7/25 8/11 8/26 9/14 9/27
Baird's Sandpiper ** 7/30 8/13 8/29 9/15 9/29
Black-throated Gray Warbler * 7/30 8/13 9/30 10/22 11/4
Osprey * 8/4 8/14 8/26 9/16 10/18
Virginia's Warbler * 8/3 8/14 8/27 9/17 10/2
Pink-footed Shearwater * 7/1 or before 8/15 9/15 10/19 11/12
Cinnamon Teal * 7/31 8/16 9/5 9/28 10/14
Nashville Warbler ** 8/2 8/16 9/4 9/23 10/12
Red-necked Phalarope *** 8/2 8/16 9/1 9/19 10/5
American White Pelican * 7/1 or before 8/17 9/1 9/26 12/11
Ashy Storm-Petrel * 7/1 or before 8/18 9/11 10/8 10/26
Red-headed Woodpecker * 8/8 8/18 8/31 9/15 9/26
Buff-breasted Sandpiper * 8/9 8/19 9/2 9/16 9/26
Gray Catbird * 8/10 8/19 8/31 9/19 10/2
Killdeer *** 8/4 8/19 9/8 9/30 11/20
MacGillivray's Warbler *** 8/8 8/19 9/4 9/23 10/7
Red-eyed Vireo * 8/11 8/19 8/30 9/17 9/29
Yellow Warbler *** 8/5 8/19 9/8 10/3 10/21
Chipping Sparrow * 8/7 8/20 9/8 10/11 11/5
Green-winged Teal ** 8/7 8/20 11/21 - -
Northern Shoveler *** 8/5 8/20 11/22 - -
Northern Waterthrush * 8/9 8/20 9/4 9/19 10/3
Willow Flycatcher ** 8/9 8/20 9/3 9/23 10/7
Black Storm-Petrel * 7/1 or before 8/21 9/6 10/21 11/1
Blue-winged Teal * 8/6 8/21 9/28 10/24 11/8
Brewer's Sparrow * 8/6 8/21 9/8 9/28 10/11
Brown Thrasher * 8/12 8/21 9/5 9/21 10/6
Buller's Shearwater * 7/28 8/21 9/21 10/22 11/15
Least Flycatcher * 8/11 8/21 9/6 9/24 10/8
Yellow-headed Blackbird * 8/12 8/21 9/2 9/24 10/11

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Black-headed Grosbeak *** - - 7/1 or before 9/2 9/30
Northern Rough-winged Swallow ** - - 7/1 or before 9/10 9/27
Olive-sided Flycatcher * - - 7/1 or before 9/19 10/3
Black Skimmer * - 7/1 or before 7/12 8/23 9/16
Western Kingbird *** - - 7/13 9/10 9/26
Plumbeous Vireo * - - 7/15 9/22 10/6
Hooded Oriole * - 7/1 or before 7/22 8/21 9/20
Lesser Nighthawk * - 7/1 or before 7/23 8/26 9/14
Calliope Hummingbird * - 7/1 or before 7/27 9/3 9/23
Summer Tanager * - - 7/27 10/3 10/15
Bell's Vireo * - 7/1 or before 7/28 9/26 10/12
Broad-tailed Hummingbird ** - 7/1 or before 7/28 9/3 9/26
Yellow-billed Cuckoo * - 7/1 or before 7/28 8/28 9/19
White-winged Dove ** - 7/1 or before 7/29 8/27 9/19
Blue Grosbeak ** 7/1 or before 7/1 7/31 9/16 10/12
Caspian Tern ** - 7/1 or before 7/31 9/6 9/24
Rufous Hummingbird *** 7/1 or before 7/1 8/1 9/8 9/25
Purple Martin * - 7/1 or before 8/3 9/7 9/22
Broad-billed Hummingbird * 7/1 or before 7/16 8/4 8/22 9/6
Common Nighthawk ** - - 8/4 9/1 9/22
Grace's Warbler * 7/1 or before 7/22 8/4 9/2 9/20
Mississippi Kite * - 7/1 or before 8/4 9/6 10/1
Pigeon Guillemot * 7/1 or before 7/19 8/4 8/27 9/13
Sulphur-bellied Flycatcher * 7/1 or before 7/21 8/4 8/22 9/3
Whimbrel * 7/1 or before 7/10 8/5 10/3 -
Blue-throated Hummingbird * 7/1 or before 7/19 8/5 8/22 9/3
Red-faced Warbler * - - 8/5 8/25 9/7
Western Wood-Pewee *** - - 8/7 9/26 10/12
Black-chinned Hummingbird *** 7/1 or before 7/16 8/9 9/13 10/4
Zone-tailed Hawk * 7/1 or before 7/17 8/9 9/23 10/11
Snowy Plover * 7/1 or before 7/4 8/10 9/9 10/4
Eastern Kingbird ** 7/24 8/1 8/11 9/2 9/16
Wilson's Phalarope ** 7/1 or before 7/13 8/11 9/11 10/3
Swainson's Hawk ** - 7/26 8/14 9/27 10/13
Upland Sandpiper * 7/26 8/2 8/14 8/29 9/10
Black Tern * 7/1 or before 7/24 8/15 9/24 10/8
Mourning Dove *** - 7/1 or before 8/17 9/22 10/8
Bank Swallow * - 7/1 or before 8/18 9/12 9/28
Lark Sparrow ** 7/21 8/1 8/19 9/19 10/5
Semipalmated Sandpiper * 7/1 or before 7/31 8/19 9/9 9/22
Lazuli Bunting ** 8/5 8/11 8/20 9/17 10/10
Lark Bunting * 7/25 8/4 8/21 9/9 9/26
Ruddy Turnstone * 7/1 or before 7/13 8/21 9/8 12/5
Spotted Sandpiper *** 7/1 or before 7/3 8/21 9/19 10/4

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart
Black Swift * - - 7/1 or before 7/3 9/25
Bullock's Oriole ** - - 7/1 or before 7/20 9/15
Tree Swallow *** - - 7/1 or before 7/25 9/13
Violet-green Swallow ** - - 7/1 or before 7/26 10/15
Lucy's Warbler * - - 7/1 or before 7/27 10/16
Yellow-breasted Chat * - - 7/1 or before 7/28 9/29
Gull-billed Tern * - - 7/1 or before 8/1 9/13
Ash-throated Flycatcher *** - 7/1 or before 7/4 8/2 8/18
Bronzed Cowbird * - - 7/18 8/6 8/20
Brown-crested Flycatcher ** - - 7/20 8/8 8/22
Cliff Swallow *** - - 7/1 or before 8/9 9/14
Scott's Oriole * - 7/1 or before 7/15 8/10 8/24
Indigo Bunting * - 7/1 or before 7/21 8/11 10/2
Least Tern * - 7/1 or before 7/15 8/12 8/29
Hooded Oriole ** - 7/1 or before 7/22 8/21 9/20

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Farnsworth and Van Doren

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