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

Western Tanager Population Trend in Oregon

All statesForest birds

Western Tanager in Oregon has edged up: up 19% on the route-weighted index since 1970.

+19%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 →
122Routes 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 OregonNotable 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 Oregon. See the full index history below.

Western Tanager Population Forecast in Oregon

If the recent trend holds, Western Tanager in Oregon is projected to fall about 13% by 2030 — from 14 in 2025 to a central estimate of 12 (95% range 8.7–16). A 5-year backtest shows a typical error of ±9.3%, with 100% of held-out values landing inside the 95% band.

-13%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 →
12Projected 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 →
8.7–1695% 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 →
±9.3%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 Oregon is projected to fall about 13% by 2030 — from 14 in 2025 to a central estimate of 12 (95% range 8.7–16). A 5-year backtest shows a typical error of ±9.3%, with 100% 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 →
2026128.415
2027128.516
2028128.616
2029128.616
2030128.716

Western Tanager Survey Routes in Oregon

Routes recording Western Tanager in Oregon.
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 →
Donnelly8320061994
Badger Creek6320251992
Wallowa5720252025
Secret Val4720251975
Silvies4720241994
Hash Rock4620251983
Barnhouse4620251998
Black Mtn.4620041993
Lakeview4520251996
Barnes Val4119871971
Mount Vernon4120241986
Hells Canyon3920251992
Paisley3520251973
Elkton3520251972
Silver Creek3520251984
Mt Hood3420251972
Wizard Falls3420251998
Ruch3420251992
Cinderella3420251993
Prospect3420251993
Lapham Res.3320251992
Eagle Creek3320251993
Donelly 23320252018
Summit Pr3120251980
Monument3120251993

Western Tanager Population Trend in Other States

alaskaarizonacaliforniacoloradoidahomontananebraskanevadanew-mexicosouth-dakotatexasutahwashingtonwyoming

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