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

American Crow Population Trend in Colorado

All statesGeneralists

American Crow in Colorado has declined: down 25% on the route-weighted index since 1970.

-25%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 →
144Routes 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 ColoradoNotable 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 Colorado. See the full index history below.

American Crow Population Forecast in Colorado

If the recent trend holds, American Crow in Colorado is projected to stay roughly flat through 2029, near 4.5 (95% range 2.1–7.0). A 5-year backtest shows a typical error of ±15.5%, with 100% of held-out values landing inside the 95% band.

+5%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 →
4.5Projected 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 →
2.1–7.095% 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 →
±15.5%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 Colorado is projected to stay roughly flat through 2029, near 4.5 (95% range 2.1–7.0). A 5-year backtest shows a typical error of ±15.5%, 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 →
20254.42.06.9
20264.52.07.0
20274.52.07.0
20284.52.07.0
20294.52.17.0

American Crow Survey Routes in Colorado

Routes recording American Crow in Colorado.
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 →
Mcphee Res.5020241996
Yampa4920231969
Gold Hill4920121998
Douglas Pass4620241992
Deadman Rd.3220241995
Gordon Creek2720181989
De Beque2220241993
Radium2220132004
Campo2020181988
Steamboat L.2020241996
Yellowjacket Pass1920241998
Fox Creek1820241993
Antonito1720041995
Buford1620241988
Owl Creek Pass1620241998
Fleming1519991968
Animas 21520212005
Flattops1420191994
Lizard Head Pass1420242001
Colona1320141979
Gold Hill 21320242018
Moffat1220241976
Animas1220041998
Pinon1120241992
Hudson1020031993

American Crow Population Trend in Other States

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

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