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Species · Montana · BBS 2026 Release · 1966–2025

American Crow Population Trend in Montana

All statesGeneralists

American Crow in Montana 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 →
93Routes 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 →
57YearsYears 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 MontanaNotable 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 Montana. See the full index history below.

American Crow Population Forecast in Montana

If the recent trend holds, American Crow in Montana is projected to fall about 16% by 2030 — from 4.2 in 2025 to a central estimate of 3.6 (95% range 1.5–5.6). A 5-year backtest shows a typical error of ±24.5%, with 100% of held-out values landing inside the 95% band.

-16%Change by 2030TrendPercent 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 →
3.6Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
1.5–5.695% 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 →
±24.5%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 Montana is projected to fall about 16% by 2030 — from 4.2 in 2025 to a central estimate of 3.6 (95% range 1.5–5.6). A 5-year backtest shows a typical error of ±24.5%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20263.71.65.7
20273.61.65.7
20283.61.65.7
20293.61.55.6
20303.61.55.6

American Crow Survey Routes in Montana

Routes recording American Crow in Montana.
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 →
Red Rock6320251973
Hehn Draw3920252016
St Mary2020081968
Chestnut1920251968
Clinton1820251975
Hebgen Lake1820252017
Cabin Creek1720252018
Twin Bridges1319761968
Philipsburg1320252015
Redstone1220251968
Greenoagh 31220182013
East Glacier Park1120252015
Miles City1120252016
Custer 21120252024
Custer1020222019
Kalispell920251968
Greenough920031996
Virgelle820251979
Brandenberg820251968
St. Mary 2820252009
Wise River720251993
Willow Creek 2720251982
Lindsay720242015
Elliston620251968
Muddy Creek620152015

American Crow Population Trend in Other States

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

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.