60 birds were recorded seen in California 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

Red-tailed Hawk

White-crowned Sparrow

Yellow-rumped Warbler
Black Phoebe

Great Blue Heron

Great Egret
Anna's Hummingbird

Mallard
California Scrub-Jay

Western Gull
Snowy Egret
House Finch
All birds seen in California in October
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 8,640 | Jan (past peak) |
| 2 | White-crowned Sparrow | Zonotrichia leucophrys | New World Sparrows | 8,243 | Jan (past peak) |
| 3 | Yellow-rumped Warbler | Setophaga coronata | New World Warblers | 6,398 | Jan (past peak) |
| 4 | Black Phoebe | Sayornis nigricans | Tyrant Flycatchers | 6,155 | Apr (past peak) |
| 5 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 5,572 | Jan (past peak) |
| 6 | Great Egret | Ardea alba | Herons, Egrets, and Bitterns | 5,550 | Jan (past peak) |
| 7 | Anna's Hummingbird | Calypte anna | Hummingbirds | 5,129 | Apr (past peak) |
| 8 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 4,935 | Apr (past peak) |
| 9 | California Scrub-Jay | Aphelocoma californica | Crows, Jays, and Magpies | 4,903 | Apr (past peak) |
| 10 | Western Gull | Larus occidentalis | Gulls, Terns, and Skimmers | 4,825 | Aug (past peak) |
| 11 | Snowy Egret | Egretta thula | Herons, Egrets, and Bitterns | 4,617 | Jan (past peak) |
| 12 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 4,339 | Apr (past peak) |
| 13 | American Coot | Fulica americana | Rails, Gallinules, and Coots | 3,872 | Jan (past peak) |
| 14 | Western Bluebird | Sialia mexicana | Thrushes | 3,816 | Apr (past peak) |
| 15 | Red-shouldered Hawk | Buteo lineatus | Hawks, Eagles, and Kites | 3,798 | Jan (past peak) |
| 16 | Acorn Woodpecker | Melanerpes formicivorus | Woodpeckers | 3,780 | Apr (past peak) |
| 17 | Turkey Vulture | Cathartes aura | New World Vultures | 3,728 | Apr (past peak) |
| 18 | Dark-eyed Junco | Junco hyemalis | New World Sparrows | 3,582 | Apr (past peak) |
| 19 | Brown Pelican | Pelecanus occidentalis | Pelicans | 3,522 | Sep (past peak) |
| 20 | California Towhee | Melozone crissalis | New World Sparrows | 3,478 | Apr (past peak) |
| 21 | Double-crested Cormorant | Nannopterum auritum | Cormorants and Shags | 3,294 | Jan (past peak) |
| 22 | American Crow | Corvus brachyrhynchos | Crows, Jays, and Magpies | 3,262 | Apr (past peak) |
| 23 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 3,245 | Jul (past peak) |
| 24 | Common Raven | Corvus corax | Crows, Jays, and Magpies | 3,175 | Apr (past peak) |
| 25 | Lesser Goldfinch | Spinus psaltria | Finches, Euphonias, and Allies | 2,990 | Apr (past peak) |
| 26 | Say's Phoebe | Sayornis saya | Tyrant Flycatchers | 2,939 | Jan (past peak) |
| 27 | Golden-crowned Sparrow | Zonotrichia atricapilla | New World Sparrows | 2,883 | Jan (past peak) |
| 28 | Wild Turkey | Meleagris gallopavo | Pheasants, Grouse, and Allies | 2,837 | Apr (past peak) |
| 29 | Black-crowned Night Heron | Nycticorax nycticorax | Herons, Egrets, and Bitterns | 2,789 | Apr (past peak) |
| 30 | Northern Mockingbird | Mimus polyglottos | Mockingbirds and Thrashers | 2,774 | Apr (past peak) |
| 31 | Northern Flicker | Colaptes auratus | Woodpeckers | 2,773 | Oct (peak) |
| 32 | American Kestrel | Falco sparverius | Falcons and Caracaras | 2,693 | Jan (past peak) |
| 33 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 2,688 | Apr (past peak) |
| 34 | Song Sparrow | Melospiza melodia | New World Sparrows | 2,625 | Apr (past peak) |
| 35 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 2,548 | Apr (past peak) |
| 36 | Townsend's Warbler | Setophaga townsendi | New World Warblers | 2,477 | Oct (peak) |
| 37 | Hermit Thrush | Catharus guttatus | Thrushes | 2,370 | Oct (peak) |
| 38 | Savannah Sparrow | Passerculus sandwichensis | New World Sparrows | 2,365 | Oct (peak) |
| 39 | Brewer's Blackbird | Euphagus cyanocephalus | New World Blackbirds and Orioles | 2,179 | Apr (past peak) |
| 40 | Willet | Tringa semipalmata | Sandpipers and Allies | 2,171 | Jan (past peak) |
| 41 | Pied-billed Grebe | Podilymbus podiceps | Grebes | 2,055 | Jan (past peak) |
| 42 | Ruby-crowned Kinglet | Corthylio calendula | Kinglets | 2,042 | Dec (rising) |
| 43 | Bushtit | Psaltriparus minimus | Long-tailed Tits and Bushtits | 2,037 | Apr (past peak) |
| 44 | Great Horned Owl | Bubo virginianus | Typical Owls | 1,977 | Apr (past peak) |
| 45 | Killdeer | Charadrius vociferus | Plovers and Lapwings | 1,967 | Apr (past peak) |
| 46 | Marbled Godwit | Limosa fedoa | Sandpipers and Allies | 1,915 | Sep (past peak) |
| 47 | American White Pelican | Pelecanus erythrorhynchos | Pelicans | 1,881 | Jan (past peak) |
| 48 | Least Sandpiper | Calidris minutilla | Sandpipers and Allies | 1,855 | Sep (past peak) |
| 49 | Greater Yellowlegs | Tringa melanoleuca | Sandpipers and Allies | 1,847 | Jan (past peak) |
| 50 | Osprey | Pandion haliaetus | Ospreys | 1,796 | Jul (past peak) |