60 birds were recorded seen in Oklahoma in September in our iNaturalist sample; 1 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in September

Great-tailed Grackle
Canada Goose

Great Blue Heron

Northern Cardinal

Great Egret

Turkey Vulture

Mourning Dove

Mallard

Ruby-throated Hummingbird
Eastern Phoebe

House Sparrow

Scissor-tailed Flycatcher
All birds seen in Oklahoma in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Great-tailed Grackle | Quiscalus mexicanus | New World Blackbirds and Orioles | 227 | Apr (past peak) |
| 2 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 220 | Apr (past peak) |
| 3 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 219 | Apr (past peak) |
| 4 | Northern Cardinal | Cardinalis cardinalis | Cardinals and Allies | 169 | Apr (past peak) |
| 5 | Great Egret | Ardea alba | Herons, Egrets, and Bitterns | 164 | Apr (past peak) |
| 6 | Turkey Vulture | Cathartes aura | New World Vultures | 163 | Apr (past peak) |
| 7 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 160 | Apr (past peak) |
| 8 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 133 | Apr (past peak) |
| 9 | Ruby-throated Hummingbird | Archilochus colubris | Hummingbirds | 127 | May (past peak) |
| 10 | Eastern Phoebe | Sayornis phoebe | Tyrant Flycatchers | 118 | Apr (past peak) |
| 11 | House Sparrow | Passer domesticus | Old World Sparrows | 113 | Apr (past peak) |
| 12 | Scissor-tailed Flycatcher | Tyrannus forficatus | Tyrant Flycatchers | 109 | Apr (past peak) |
| 13 | Carolina Chickadee | Poecile carolinensis | Tits, Chickadees, and Titmice | 105 | Apr (past peak) |
| 14 | Northern Mockingbird | Mimus polyglottos | Mockingbirds and Thrashers | 94 | Apr (past peak) |
| 15 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 92 | Dec (rising) |
| 16 | Blue Jay | Cyanocitta cristata | Crows, Jays, and Magpies | 91 | Apr (past peak) |
| 17 | Red-shouldered Hawk | Buteo lineatus | Hawks, Eagles, and Kites | 88 | Jan (past peak) |
| 18 | Red-headed Woodpecker | Melanerpes erythrocephalus | Woodpeckers | 88 | Apr (past peak) |
| 19 | Killdeer | Charadrius vociferus | Plovers and Lapwings | 84 | Apr (past peak) |
| 20 | Wild Turkey | Meleagris gallopavo | Pheasants, Grouse, and Allies | 82 | Apr (past peak) |
| 21 | Mississippi Kite | Ictinia mississippiensis | Hawks, Eagles, and Kites | 81 | Aug (past peak) |
| 22 | American White Pelican | Pelecanus erythrorhynchos | Pelicans | 77 | Nov (rising) |
| 23 | Red-bellied Woodpecker | Melanerpes carolinus | Woodpeckers | 76 | Apr (past peak) |
| 24 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 75 | Apr (past peak) |
| 25 | European Starling | Sturnus vulgaris | Starlings | 73 | Apr (past peak) |
| 26 | Eastern Bluebird | Sialia sialis | Thrushes | 71 | Apr (past peak) |
| 27 | Osprey | Pandion haliaetus | Ospreys | 65 | Apr (past peak) |
| 28 | Green Heron | Butorides virescens | Herons, Egrets, and Bitterns | 64 | Jul (past peak) |
| 29 | American Robin | Turdus migratorius | Thrushes | 63 | Apr (past peak) |
| 30 | Snowy Egret | Egretta thula | Herons, Egrets, and Bitterns | 62 | Apr (past peak) |
| 31 | Tufted Titmouse | Baeolophus bicolor | Tits, Chickadees, and Titmice | 62 | Apr (past peak) |
| 32 | Carolina Wren | Thryothorus ludovicianus | Wrens | 61 | Apr (past peak) |
| 33 | Summer Tanager | Piranga rubra | Cardinals and Allies | 61 | May (past peak) |
| 34 | Northern Yellow Warbler | Setophaga aestiva | New World Warblers | 58 | May (past peak) |
| 35 | Eurasian Collared-Dove | Streptopelia decaocto | Pigeons and Doves | 55 | Apr (past peak) |
| 36 | Northern Flicker | Colaptes auratus | Woodpeckers | 55 | Oct (rising) |
| 37 | American Kestrel | Falco sparverius | Falcons and Caracaras | 52 | Dec (rising) |
| 38 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 52 | Apr (past peak) |
| 39 | Yellow-crowned Night Heron | Nyctanassa violacea | Herons, Egrets, and Bitterns | 51 | May (past peak) |
| 40 | Brown Thrasher | Toxostoma rufum | Mockingbirds and Thrashers | 51 | Apr (past peak) |
| 41 | Least Sandpiper | Calidris minutilla | Sandpipers and Allies | 50 | Sep (peak) |
| 42 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 46 | Apr (past peak) |
| 43 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 43 | Jan (past peak) |
| 44 | Barred Owl | Strix varia | Typical Owls | 41 | Apr (past peak) |
| 45 | Nashville Warbler | Leiothlypis ruficapilla | New World Warblers | 41 | Oct (rising) |
| 46 | Belted Kingfisher | Megaceryle alcyon | Kingfishers | 40 | Apr (past peak) |
| 47 | Eastern Kingbird | Tyrannus tyrannus | Tyrant Flycatchers | 40 | May (past peak) |
| 48 | Great Horned Owl | Bubo virginianus | Typical Owls | 40 | Apr (past peak) |
| 49 | Swainson's Hawk | Buteo swainsoni | Hawks, Eagles, and Kites | 39 | Apr (past peak) |
| 50 | Greater Roadrunner | Geococcyx californianus | Cuckoos | 38 | Jul (past peak) |