60 birds were recorded seen in Utah in September in our iNaturalist sample; 2 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in September

Mallard

Common Raven

Red-tailed Hawk

Woodhouse's Scrub-Jay

American Avocet
Black-billed Magpie

Cooper's Hawk

Wild Turkey

Steller's Jay

Turkey Vulture

Great Blue Heron
American White Pelican
All birds seen in Utah in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 309 | Apr (past peak) |
| 2 | Common Raven | Corvus corax | Crows, Jays, and Magpies | 297 | May (past peak) |
| 3 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 292 | Jan (past peak) |
| 4 | Woodhouse's Scrub-Jay | Aphelocoma woodhouseii | Crows, Jays, and Magpies | 255 | May (past peak) |
| 5 | American Avocet | Recurvirostra americana | Stilts and Avocets | 234 | Apr (past peak) |
| 6 | Black-billed Magpie | Pica hudsonia | Crows, Jays, and Magpies | 219 | Apr (past peak) |
| 7 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 211 | Aug (past peak) |
| 8 | Wild Turkey | Meleagris gallopavo | Pheasants, Grouse, and Allies | 210 | Apr (past peak) |
| 9 | Steller's Jay | Cyanocitta stelleri | Crows, Jays, and Magpies | 209 | Aug (past peak) |
| 10 | Turkey Vulture | Cathartes aura | New World Vultures | 199 | Apr (past peak) |
| 11 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 188 | Apr (past peak) |
| 12 | American White Pelican | Pelecanus erythrorhynchos | Pelicans | 179 | May (past peak) |
| 13 | Northern Flicker | Colaptes auratus | Woodpeckers | 177 | Oct (rising) |
| 14 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 174 | May (past peak) |
| 15 | White-crowned Sparrow | Zonotrichia leucophrys | New World Sparrows | 173 | Apr (past peak) |
| 16 | American Kestrel | Falco sparverius | Falcons and Caracaras | 146 | Jan (past peak) |
| 17 | Ring-billed Gull | Larus delawarensis | Gulls, Terns, and Skimmers | 144 | Dec (rising) |
| 18 | Lesser Goldfinch | Spinus psaltria | Finches, Euphonias, and Allies | 141 | Apr (past peak) |
| 19 | Black-capped Chickadee | Poecile atricapillus | Tits, Chickadees, and Titmice | 132 | Apr (past peak) |
| 20 | American Coot | Fulica americana | Rails, Gallinules, and Coots | 124 | Apr (past peak) |
| 21 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 124 | Apr (past peak) |
| 22 | Great Horned Owl | Bubo virginianus | Typical Owls | 119 | May (past peak) |
| 23 | Snowy Egret | Egretta thula | Herons, Egrets, and Bitterns | 118 | May (past peak) |
| 24 | California Quail | Callipepla californica | New World Quails | 115 | May (past peak) |
| 25 | Black-necked Stilt | Himantopus mexicanus | Stilts and Avocets | 115 | May (past peak) |
| 26 | Western Tanager | Piranga ludoviciana | Cardinals and Allies | 114 | May (past peak) |
| 27 | Mountain Chickadee | Poecile gambeli | Tits, Chickadees, and Titmice | 112 | Sep (peak) |
| 28 | Orange-crowned Warbler | Leiothlypis celata | New World Warblers | 112 | Sep (peak) |
| 29 | American Robin | Turdus migratorius | Thrushes | 109 | Apr (past peak) |
| 30 | Eurasian Collared-Dove | Streptopelia decaocto | Pigeons and Doves | 107 | Apr (past peak) |
| 31 | Rock Wren | Salpinctes obsoletus | Wrens | 107 | May (past peak) |
| 32 | European Starling | Sturnus vulgaris | Starlings | 107 | Apr (past peak) |
| 33 | Dark-eyed Junco | Junco hyemalis | New World Sparrows | 106 | Mar (past peak) |
| 34 | Yellow-rumped Warbler | Setophaga coronata | New World Warblers | 106 | May (past peak) |
| 35 | Black-chinned Hummingbird | Archilochus alexandri | Hummingbirds | 105 | May (past peak) |
| 36 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 105 | Apr (past peak) |
| 37 | White-faced Ibis | Plegadis chihi | Ibises and Spoonbills | 99 | May (past peak) |
| 38 | House Sparrow | Passer domesticus | Old World Sparrows | 98 | Apr (past peak) |
| 39 | Chipping Sparrow | Spizella passerina | New World Sparrows | 91 | May (past peak) |
| 40 | Dusky Grouse | Dendragapus obscurus | Pheasants, Grouse, and Allies | 90 | Jul (past peak) |
| 41 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 90 | May (past peak) |
| 42 | Brewer's Sparrow | Spizella breweri | New World Sparrows | 90 | Aug (past peak) |
| 43 | Forster's Tern | Sterna forsteri | Gulls, Terns, and Skimmers | 89 | May (past peak) |
| 44 | Swainson's Hawk | Buteo swainsoni | Hawks, Eagles, and Kites | 89 | Apr (past peak) |
| 45 | Clark's Nutcracker | Nucifraga columbiana | Crows, Jays, and Magpies | 86 | Jul (past peak) |
| 46 | Song Sparrow | Melospiza melodia | New World Sparrows | 86 | May (past peak) |
| 47 | Spotted Towhee | Pipilo maculatus | New World Sparrows | 86 | May (past peak) |
| 48 | Double-crested Cormorant | Nannopterum auritum | Cormorants and Shags | 86 | May (past peak) |
| 49 | Killdeer | Charadrius vociferus | Plovers and Lapwings | 81 | Apr (past peak) |
| 50 | Franklin's Gull | Leucophaeus pipixcan | Gulls, Terns, and Skimmers | 79 | Aug (past peak) |