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Species · Colorado · BBS 2025 Release · 1966–2024

Black-throated Gray Warbler Population Trend in Colorado

All statesForest birds

Black-throated Gray Warbler in Colorado has surged: up 215% on the route-weighted index since 1975.

+215%Since 1975
40Routes In State
48Years

Notable Black-throated Gray Warbler Trends in Colorado

long arc increasecomputed index

Black-throated Gray Warbler has surged in Colorado: up 215% on the route-weighted index since 1975.

Black-throated Gray Warbler Population Forecast in Colorado

If the recent trend holds, Black-throated Gray Warbler in Colorado is projected to rise about 17% by 2029 — from 0.59 in 2024 to a central estimate of 0.69 (95% range 0.39–0.99). A 5-year backtest shows a typical error of ±33.8%, with 80% of held-out values landing inside the 95% band.

+17%Change by 2029
0.69Projected 2029 index
0.39–0.9995% range
±33.8%Backtest error
19732029
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
20250.650.350.95
20260.660.360.96
20270.670.370.97
20280.680.380.98
20290.690.390.99

Black-throated Gray Warbler Survey Routes in Colorado

Routes recording Black-throated Gray Warbler in Colorado.
Wray Gulch1820231988
Angora1520241998
Baxter Pass1220241994
Mesaverde Np920241996
Dinosaur520241995
Douglas Pass420241982
Blackhead Pk420192019
Wilson Creek320191996
Nucla320242000
Rosevale220242009
Uncompahgre220182017
Basin220191999
Browns Park220241995
Pinon220212013
Rifle Falls220181998
Cone Mtn220182018
Maybell120242004
Buford120241973
Aspen120141979
Delta120211973
Falfa120012001
Villegreen120002000
Gribbles Prk120212007
Animas119961996
South Fork120012001

Black-throated Gray Warbler Population Trend in Other States

arizonacaliforniaidahonevadanew-mexicooregonutahwashingtonwyoming

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