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

Yellow Warbler Population Trend in Colorado

All statesForest birds

Yellow Warbler in Colorado has held roughly steady: down 9% on the route-weighted index since 1970.

-9%Since 1970
143Routes In State
56Years

Notable Yellow Warbler Trends in Colorado

No notable trend signals for Yellow Warbler in Colorado. See the full index history below.

Yellow Warbler Population Forecast in Colorado

If the recent trend holds, Yellow Warbler in Colorado is projected to rise about 16% by 2029 — from 4.2 in 2024 to a central estimate of 4.8 (95% range 1.5–8.1). A 5-year backtest shows a typical error of ±20%, with 100% of held-out values landing inside the 95% band.

+16%Change by 2029
4.8Projected 2029 index
1.5–8.195% range
±20%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
20254.91.68.2
20264.91.68.2
20274.91.68.2
20284.91.68.2
20294.81.58.1

Yellow Warbler Survey Routes in Colorado

Routes recording Yellow Warbler in Colorado.
Yampa4520231969
Castleton4520241988
Aspen4020241979
Ragged Mtn.3020191994
Yellowjacket Pass2620241998
Stillwater Pass2120091998
Buford1820241970
Animas 21720212005
Douglas Pass1520241982
Cheesman Lk1520241969
Parlin1520231968
De Beque1520241992
Blackhead Pk1420211991
Moon Pass1420242003
Cortez1320081988
Pinos Creek1219901988
Walden1120241990
Doyleville1120241988
Alamosa1120241988
Paonia1120241992
Heeney1120192017
Dolores1019871968
Fox Creek1020241993
Weston Pass1020001994
Cortez 21020172009

Yellow Warbler Population Trend in Other States

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

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