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Species · Colorado · BBS 2025 Release · 1966–2024

Virginia's Warbler Population Trend in Colorado

All statesForest birds

Virginia's Warbler in Colorado has surged: up 321% on the route-weighted index since 1973.

+321%Since 1973
65Routes In State
53Years

Notable Virginia's Warbler Trends in Colorado

long arc increasecomputed index

Virginia's Warbler has surged in Colorado: up 321% on the route-weighted index since 1973.

Virginia's Warbler Population Forecast in Colorado

If the recent trend holds, Virginia's Warbler in Colorado is projected to fall about 32% by 2029 — from 2.4 in 2024 to a central estimate of 1.6 (95% range 0.93–2.3). A 5-year backtest shows a typical error of ±48.5%, with 60% of held-out values landing inside the 95% band.

-32%Change by 2029
1.6Projected 2029 index
0.93–2.395% range
±48.5%Backtest error
19692029
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
20251.50.852.2
20261.60.872.2
20271.60.892.3
20281.60.912.3
20291.60.932.3

Virginia's Warbler Survey Routes in Colorado

Routes recording Virginia's Warbler in Colorado.
Mesaverde Np4020241996
Baxter Pass3520241996
Douglas Pass2420241982
Yellowjacket Pass2120241998
Angora1920241998
Nucla1220241999
Buford1020241980
Wilson Creek1020241990
Ludlow920161998
Ragged Mtn.820191994
Gribbles Prk820241998
Delta720211973
Black Sulphur Cr720242015
Cheesman Lk620241969
Rosevale620232009
Cokedale620241995
Cortez 2520172009
Dolores Riv520241988
Marshall Pas520021998
Pagosa Spgs419751975
Wet Mtns.420241993
Gold Hill420121998
Haycamp Mesa420241998
Gold Hill 2320232023
Paonia320241992

Virginia's Warbler Population Trend in Other States

arizonacaliforniaidahonevadanew-mexicosouth-dakotautahwyoming

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