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

Wilson's Warbler Population Trend in Wyoming

All statesForest birds

Wilson's Warbler in Wyoming has declined: down 49% on the route-weighted index since 1970.

-49%Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
36Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
49YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Wilson's Warbler Trends in WyomingNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Wilson's Warbler in Wyoming. See the full index history below.

Wilson's Warbler Population Forecast in Wyoming

If the recent trend holds, Wilson's Warbler in Wyoming is projected to fall about 67% by 2029 — from 0.28 in 2024 to a central estimate of 0.09 (95% range 0.00–0.32). A 5-year backtest shows a typical error of ±38.9%, with 100% of held-out values landing inside the 95% band.

-67%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.09Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.3295% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±38.9%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Wilson's Warbler in Wyoming is projected to fall about 67% by 2029 — from 0.28 in 2024 to a central estimate of 0.09 (95% range 0.00–0.32). A 5-year backtest shows a typical error of ±38.9%, with 100% of held-out values landing inside the 95% band.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 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20250.120.000.35
20260.110.000.34
20270.100.000.34
20280.100.000.33
20290.090.000.32

Wilson's Warbler Survey Routes in Wyoming

Routes recording Wilson's Warbler in Wyoming.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Crazy Woman1020241979
Green River1019821977
Soda Lake920241980
Walcott619821982
Colter Bay 2520222021
Colter Bay419971968
Crowheart420052005
Fiddler Lk420241987
Buckskin Mtn320161980
Big Sandy319941989
Ryan Park320232011
Mammoth220221988
Meeteetse220142014
Horse Creek220241982
Ethete220021997
Mtn View219901980
Harmony220152014
Otto120172017
Yellowstone120192012
Dubois120141977
Midvale120172017
Cumberland119781978
Savery119891989
Hunter Peak119961986
Moose120181994

Wilson's Warbler Population Trend in Other States

alaskacaliforniacoloradoidahomainemichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorkoregonutahvermontwashingtonwisconsin

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