60 birds were recorded seen in Iowa in September in our iNaturalist sample; 8 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in September

House Sparrow

Turkey Vulture

Ruby-throated Hummingbird

Great Blue Heron

Red-tailed Hawk
Canada Goose

Mallard

American Goldfinch

Wild Turkey
American White Pelican

Northern Cardinal

Mourning Dove
All birds seen in Iowa in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | House Sparrow | Passer domesticus | Old World Sparrows | 217 | Jul (past peak) |
| 2 | Turkey Vulture | Cathartes aura | New World Vultures | 151 | May (past peak) |
| 3 | Ruby-throated Hummingbird | Archilochus colubris | Hummingbirds | 133 | Sep (peak) |
| 4 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 124 | Aug (past peak) |
| 5 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 105 | Mar (past peak) |
| 6 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 105 | Apr (past peak) |
| 7 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 104 | Apr (past peak) |
| 8 | American Goldfinch | Spinus tristis | Finches, Euphonias, and Allies | 96 | May (past peak) |
| 9 | Wild Turkey | Meleagris gallopavo | Pheasants, Grouse, and Allies | 83 | May (past peak) |
| 10 | American White Pelican | Pelecanus erythrorhynchos | Pelicans | 74 | Apr (past peak) |
| 11 | Northern Cardinal | Cardinalis cardinalis | Cardinals and Allies | 72 | Apr (past peak) |
| 12 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 71 | May (past peak) |
| 13 | Northern Flicker | Colaptes auratus | Woodpeckers | 70 | Apr (past peak) |
| 14 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 70 | Dec (rising) |
| 15 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 68 | Aug (past peak) |
| 16 | Blue Jay | Cyanocitta cristata | Crows, Jays, and Magpies | 67 | May (past peak) |
| 17 | Great Egret | Ardea alba | Herons, Egrets, and Bitterns | 54 | Sep (peak) |
| 18 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 51 | Mar (past peak) |
| 19 | Black-capped Chickadee | Poecile atricapillus | Tits, Chickadees, and Titmice | 51 | Mar (past peak) |
| 20 | Cedar Waxwing | Bombycilla cedrorum | Waxwings | 48 | Jun (past peak) |
| 21 | White-breasted Nuthatch | Sitta carolinensis | Nuthatches | 48 | Dec (rising) |
| 22 | Gray Catbird | Dumetella carolinensis | Mockingbirds and Thrashers | 48 | May (past peak) |
| 23 | Red-bellied Woodpecker | Melanerpes carolinus | Woodpeckers | 47 | Dec (rising) |
| 24 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 45 | Aug (past peak) |
| 25 | American Crow | Corvus brachyrhynchos | Crows, Jays, and Magpies | 44 | May (past peak) |
| 26 | American Robin | Turdus migratorius | Thrushes | 44 | May (past peak) |
| 27 | Red-headed Woodpecker | Melanerpes erythrocephalus | Woodpeckers | 44 | May (past peak) |
| 28 | Nashville Warbler | Leiothlypis ruficapilla | New World Warblers | 43 | Sep (peak) |
| 29 | Barred Owl | Strix varia | Typical Owls | 41 | May (past peak) |
| 30 | Green Heron | Butorides virescens | Herons, Egrets, and Bitterns | 39 | Aug (past peak) |
| 31 | Common Yellowthroat | Geothlypis trichas | New World Warblers | 39 | May (past peak) |
| 32 | Osprey | Pandion haliaetus | Ospreys | 38 | Sep (peak) |
| 33 | Ring-necked Pheasant | Phasianus colchicus | Pheasants, Grouse, and Allies | 36 | Apr (past peak) |
| 34 | Killdeer | Charadrius vociferus | Plovers and Lapwings | 36 | Jun (past peak) |
| 35 | Magnolia Warbler | Setophaga magnolia | New World Warblers | 36 | May (past peak) |
| 36 | Red-eyed Vireo | Vireo olivaceus | Vireos, Shrike-Babblers, and Erpornis | 33 | Sep (peak) |
| 37 | Common Nighthawk | Chordeiles minor | Nightjars and Allies | 32 | Sep (peak) |
| 38 | Eastern Bluebird | Sialia sialis | Thrushes | 31 | May (past peak) |
| 39 | Eastern Wood-Pewee | Contopus virens | Tyrant Flycatchers | 31 | Aug (past peak) |
| 40 | Broad-winged Hawk | Buteo platypterus | Hawks, Eagles, and Kites | 30 | Sep (peak) |
| 41 | European Starling | Sturnus vulgaris | Starlings | 30 | May (past peak) |
| 42 | Eastern Phoebe | Sayornis phoebe | Tyrant Flycatchers | 29 | May (past peak) |
| 43 | Ring-billed Gull | Larus delawarensis | Gulls, Terns, and Skimmers | 26 | Mar (past peak) |
| 44 | Swainson's Thrush | Catharus ustulatus | Thrushes | 26 | May (past peak) |
| 45 | Tennessee Warbler | Leiothlypis peregrina | New World Warblers | 26 | May (past peak) |
| 46 | Double-crested Cormorant | Nannopterum auritum | Cormorants and Shags | 25 | Apr (past peak) |
| 47 | Great Horned Owl | Bubo virginianus | Typical Owls | 24 | Jul (past peak) |
| 48 | Ovenbird | Seiurus aurocapilla | New World Warblers | 22 | May (past peak) |
| 49 | Bay-breasted Warbler | Setophaga castanea | New World Warblers | 22 | Sep (peak) |
| 50 | Belted Kingfisher | Megaceryle alcyon | Kingfishers | 21 | Aug (past peak) |