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Species · Colorado · BBS 2025 Release · 1966–2024

Black-headed Grosbeak Population Trend in Colorado

All statesGeneralists

Black-headed Grosbeak in Colorado has surged: up 216% on the route-weighted index since 1970.

+216%Since 1970
113Routes In State
56Years

Notable Black-headed Grosbeak Trends in Colorado

long arc increasecomputed index

Black-headed Grosbeak has surged in Colorado: up 216% on the route-weighted index since 1970.

Black-headed Grosbeak Population Forecast in Colorado

If the recent trend holds, Black-headed Grosbeak in Colorado is projected to stay roughly flat through 2029, near 2.8 (95% range 1.9–3.7). A 5-year backtest shows a typical error of ±11.7%, with 100% of held-out values landing inside the 95% band.

-5%Change by 2029
2.8Projected 2029 index
1.9–3.795% range
±11.7%Backtest error
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 index95% low95% high
20252.61.73.5
20262.61.73.5
20272.71.83.6
20282.71.83.6
20292.81.93.7

Black-headed Grosbeak Survey Routes in Colorado

Routes recording Black-headed Grosbeak in Colorado.
Mesaverde Np3920241996
Cokedale3120241995
Walsenburg2920241994
Animas2120041996
Mcphee Res.1920241996
Paonia1320241992
Nucla1320241999
Douglas Pass1220241985
Wilson Creek1220241990
Baxter Pass1220241996
Blackhead Pk1020211991
Wet Mtns.920241993
Uncompahgre720241988
Ludlow720161998
Cortez620081988
Fox Creek620241993
Gold Hill620121998
Elbert620221998
Yampa520231987
Dolores Riv520241988
Deadman Rd.520241992
Thomasville520181993
Comanche Pk520241995
Westcliffe520241998
Pagosa Spgs419821968

Black-headed Grosbeak Population Trend in Other States

alaskaarizonacaliforniaidahokansasmontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwashingtonwyoming

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