BirdAnalyst
Species · Wyoming · BBS 2026 Release · 1966–2025

Western Tanager Population Trend in Wyoming

All statesForest birds

Western Tanager in Wyoming has increased: up 29% on the route-weighted index since 1970.

+29%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 →
71Routes 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 →
57YearsYears 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 45% by 2030 — from 3.1 in 2025 to a central estimate of 1.7 (95% range 0.12–3.3). A 5-year backtest shows a typical error of ±45.4%, with 80% of held-out values landing inside the 95% band.

-45%Change by 2030TrendPercent 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 →
1.7Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.12–3.395% 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 →
±45.4%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 45% by 2030 — from 3.1 in 2025 to a central estimate of 1.7 (95% range 0.12–3.3). A 5-year backtest shows a typical error of ±45.4%, with 80% of held-out values landing inside the 95% band.19682030
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 →
20261.70.113.2
20271.70.113.2
20281.70.113.2
20291.70.123.3
20301.70.123.3

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 Mtn5120251981
Fiddler Lk2920251979
Alpine2820251979
Colter Bay 22820252021
Mammoth2320251982
Hunter Peak2020251982
Ryan Park2020252012
Soda Lake1520251981
Moran1520162002
Colter Bay1419991968
Ne Entrance1020251997
Moskee 31020252022
Sundance920251975
Moose920251976
Savery 2820252007
Clark720231991
Wilson720251979
Green River719821977
Moskee620011980
Horse Creek620251983
Warbonnet420251990
Prior Flats320252021
Savery319951989
Ethete320252021
Big Sandy320231992

Western Tanager Population Trend in Other States

alaskaarizonacaliforniacoloradoidahomontananebraskanevadanew-mexicooregonsouth-dakotatexasutahwashington

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.