BirdAnalyst
Species · California · BBS 2025 Release · 1966–2024

American Crow Population Trend in California

All statesGeneralists

American Crow in California has increased: up 40% on the route-weighted index since 1970.

+40%Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
176Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable American Crow Trends in CaliforniaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for American Crow in California. See the full index history below.

American Crow Population Forecast in California

If the recent trend holds, American Crow in California is projected to rise about 35% by 2029 — from 8.3 in 2024 to a central estimate of 11 (95% range 4.7–18). A 5-year backtest shows a typical error of ±63.1%, with 100% of held-out values landing inside the 95% band.

+35%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
11Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
4.7–1895% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±63.1%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, American Crow in California is projected to rise about 35% by 2029 — from 8.3 in 2024 to a central estimate of 11 (95% range 4.7–18). A 5-year backtest shows a typical error of ±63.1%, with 100% of held-out values landing inside the 95% band.19682029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
2025114.618
2026114.618
2027114.618
2028114.718
2029114.718

American Crow Survey Routes in California

Routes recording American Crow in California.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Iron Gate6520191988
Caruthers6419871972
Gravesboro6219951968
Collegeville5720041972
Tres Pinos 25720112005
El Toro5519991973
Harbor Lake 25320242014
Moreno5020241968
Lucerne Val4920242024
Harbor Lake4519911974
Tipton4519971972
Mark West4420241972
San Ysidro4220191988
Livermore4019911973
Hollister 24020242012
Crescent Cty3820241972
Hollister3620111973
Buena Vista3619991990
Tracy3520091992
Fairfax3220241972
Carmel Val3220241973
Cp. Pendleton3220041970
Atwater3220121972
Elizabeth Lk2920161972
Santa Ynez2720191969

American Crow Population Trend in Other States

alabamaalaskaarizonaarkansascoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.