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

Western Tanager Population Trend in Wyoming

All statesGeneralists

Western Tanager in Wyoming has held roughly steady: down 1% on the route-weighted index since 1970.

-1%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 →
69Routes 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 →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Western Tanager 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 Western Tanager in Wyoming. See the full index history below.

Western Tanager Population Forecast in Wyoming

If the recent trend holds, Western Tanager in Wyoming is projected to fall about 15% by 2029 — from 1.8 in 2024 to a central estimate of 1.5 (95% range 0.00–3.0). A 5-year backtest shows a typical error of ±40.5%, with 100% of held-out values landing inside the 95% band.

-15%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 →
1.5Projected 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 →
0.00–3.095% 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 →
±40.5%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, Western Tanager in Wyoming is projected to fall about 15% by 2029 — from 1.8 in 2024 to a central estimate of 1.5 (95% range 0.00–3.0). A 5-year backtest shows a typical error of ±40.5%, 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 →
20251.50.003.0
20261.50.003.0
20271.50.003.0
20281.50.003.0
20291.50.003.0

Western Tanager Survey Routes in Wyoming

Routes recording Western Tanager 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 →
Buckskin Mtn3220211981
Alpine2820241979
Ne Entrance2720211997
Mammoth2420241982
Colter Bay 22220242021
Fiddler Lk2020241979
Ryan Park1820232012
Moran1520162002
Colter Bay1419991968
Savery 21120242007
Moose820241976
Clark720231991
Moskee 3720242022
Green River719821977
Hunter Peak620241982
Moskee620011980
Wilson620241979
Soda Lake520241981
Buford420242001
Fox Park420221994
Savery319951989
Big Sandy320231992
Warbonnet320241990
Fletcher Pk320241981
Ervay220232023

Western Tanager Population Trend in Other States

alaskaarizonacaliforniacoloradoidahomontananebraskanevadanew-mexicooregonsouth-dakotatexasutahwashington

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