60 birds were recorded seen in Oregon in October in our iNaturalist sample; 4 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in October

Mallard

Great Blue Heron

Dark-eyed Junco
California Scrub-Jay

Red-tailed Hawk

Song Sparrow

American Crow

Northern Flicker

Golden-crowned Sparrow

Steller's Jay
Anna's Hummingbird

American Robin
All birds seen in Oregon in October
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 869 | Apr (past peak) |
| 2 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 750 | May (past peak) |
| 3 | Dark-eyed Junco | Junco hyemalis | New World Sparrows | 726 | Jan (past peak) |
| 4 | California Scrub-Jay | Aphelocoma californica | Crows, Jays, and Magpies | 651 | May (past peak) |
| 5 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 608 | Jan (past peak) |
| 6 | Song Sparrow | Melospiza melodia | New World Sparrows | 567 | Mar (past peak) |
| 7 | American Crow | Corvus brachyrhynchos | Crows, Jays, and Magpies | 549 | Mar (past peak) |
| 8 | Northern Flicker | Colaptes auratus | Woodpeckers | 524 | Mar (past peak) |
| 9 | Golden-crowned Sparrow | Zonotrichia atricapilla | New World Sparrows | 488 | Apr (past peak) |
| 10 | Steller's Jay | Cyanocitta stelleri | Crows, Jays, and Magpies | 476 | May (past peak) |
| 11 | Anna's Hummingbird | Calypte anna | Hummingbirds | 427 | Mar (past peak) |
| 12 | American Robin | Turdus migratorius | Thrushes | 422 | May (past peak) |
| 13 | Cedar Waxwing | Bombycilla cedrorum | Waxwings | 408 | Jun (past peak) |
| 14 | Great Egret | Ardea alba | Herons, Egrets, and Bitterns | 406 | Sep (past peak) |
| 15 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 395 | Apr (past peak) |
| 16 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 391 | May (past peak) |
| 17 | Cackling Goose | Branta hutchinsii | Ducks, Geese, and Swans | 381 | Oct (peak) |
| 18 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 378 | May (past peak) |
| 19 | American Wigeon | Mareca americana | Ducks, Geese, and Swans | 376 | Dec (rising) |
| 20 | Black-capped Chickadee | Poecile atricapillus | Tits, Chickadees, and Titmice | 348 | Mar (past peak) |
| 21 | American Kestrel | Falco sparverius | Falcons and Caracaras | 325 | Jan (past peak) |
| 22 | Spotted Towhee | Pipilo maculatus | New World Sparrows | 318 | Apr (past peak) |
| 23 | California Gull | Larus californicus | Gulls, Terns, and Skimmers | 315 | Oct (peak) |
| 24 | Wood Duck | Aix sponsa | Ducks, Geese, and Swans | 302 | May (past peak) |
| 25 | Varied Thrush | Ixoreus naevius | Thrushes | 292 | Jan (past peak) |
| 26 | Red-breasted Nuthatch | Sitta canadensis | Nuthatches | 291 | Sep (past peak) |
| 27 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 291 | Jan (past peak) |
| 28 | White-crowned Sparrow | Zonotrichia leucophrys | New World Sparrows | 289 | Apr (past peak) |
| 29 | Yellow-rumped Warbler | Setophaga coronata | New World Warblers | 287 | Apr (past peak) |
| 30 | Barred Owl | Strix varia | Typical Owls | 284 | Jul (past peak) |
| 31 | Western Gull | Larus occidentalis | Gulls, Terns, and Skimmers | 283 | Jul (past peak) |
| 32 | Wild Turkey | Meleagris gallopavo | Pheasants, Grouse, and Allies | 282 | Apr (past peak) |
| 33 | Pied-billed Grebe | Podilymbus podiceps | Grebes | 255 | Sep (past peak) |
| 34 | Greater White-fronted Goose | Anser albifrons | Ducks, Geese, and Swans | 248 | Oct (peak) |
| 35 | Double-crested Cormorant | Nannopterum auritum | Cormorants and Shags | 245 | Jan (past peak) |
| 36 | European Starling | Sturnus vulgaris | Starlings | 244 | May (past peak) |
| 37 | American Goldfinch | Spinus tristis | Finches, Euphonias, and Allies | 233 | May (past peak) |
| 38 | Northern Shoveler | Spatula clypeata | Ducks, Geese, and Swans | 233 | Mar (past peak) |
| 39 | Gadwall | Mareca strepera | Ducks, Geese, and Swans | 229 | May (past peak) |
| 40 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 225 | Aug (past peak) |
| 41 | Ruby-crowned Kinglet | Corthylio calendula | Kinglets | 219 | Jan (past peak) |
| 42 | Northern Harrier | Circus hudsonius | Hawks, Eagles, and Kites | 215 | Jan (past peak) |
| 43 | Green-winged Teal | Anas crecca | Ducks, Geese, and Swans | 213 | Mar (past peak) |
| 44 | Belted Kingfisher | Megaceryle alcyon | Kingfishers | 210 | Aug (past peak) |
| 45 | Brewer's Blackbird | Euphagus cyanocephalus | New World Blackbirds and Orioles | 207 | May (past peak) |
| 46 | Northern Pintail | Anas acuta | Ducks, Geese, and Swans | 204 | Jan (past peak) |
| 47 | Bushtit | Psaltriparus minimus | Long-tailed Tits and Bushtits | 204 | Mar (past peak) |
| 48 | Common Merganser | Mergus merganser | Ducks, Geese, and Swans | 203 | Jan (past peak) |
| 49 | Ring-billed Gull | Larus delawarensis | Gulls, Terns, and Skimmers | 195 | Oct (peak) |
| 50 | Killdeer | Charadrius vociferus | Plovers and Lapwings | 190 | May (past peak) |