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

Orange-crowned Warbler Population Trend in Colorado

All statesForest birds

Orange-crowned Warbler in Colorado has surged: up 416% on the route-weighted index since 1973.

+416%Since 1973
68Routes In State
49Years

Notable Orange-crowned Warbler Trends in Colorado

long arc increasecomputed index

Orange-crowned Warbler has surged in Colorado: up 416% on the route-weighted index since 1973.

Orange-crowned Warbler Population Forecast in Colorado

If the recent trend holds, Orange-crowned Warbler in Colorado is projected to stay roughly flat through 2029, near 1.3 (95% range 0.80–1.8). A 5-year backtest shows a typical error of ±39.3%, with 80% of held-out values landing inside the 95% band.

-5%Change by 2029
1.3Projected 2029 index
0.80–1.895% range
±39.3%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
20251.20.731.7
20261.20.751.7
20271.30.761.7
20281.30.781.8
20291.30.801.8

Orange-crowned Warbler Survey Routes in Colorado

Routes recording Orange-crowned Warbler in Colorado.
Owl Creek Pass1520241998
Mcphee Res.1420241996
Baxter Pass1320241994
Haycamp Mesa1320241998
Aspen1220241985
Dolores Riv1020241988
Douglas Pass720241986
Blackhead Pk720211991
Yampa620231975
Groundhog Rs620241992
Nucla620241999
Black Sulphur Cr620242015
Yellowjacket Pass520242007
Delta420211973
Colona420121972
Uncompahgre420241988
Lake City 2420242017
Pagosa Spgs319821974
Lake City320021988
Fox Creek320242008
Angora320241998
Red Cliff220171992
Doyleville219881988
Ragged Mtn.220191994
Como220231999

Orange-crowned Warbler Population Trend in Other States

alaskaarizonacaliforniaidahomontananevadanew-mexiconorth-dakotaoregonutahwashingtonwyoming

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