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

Western Tanager Population Trend in Oregon

All statesGeneralists

Western Tanager in Oregon has held roughly steady: up 10% on the route-weighted index since 1970.

+10%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 →
120Routes 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 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 stay roughly flat through 2029, near 12 (95% range 8.4–15). A 5-year backtest shows a typical error of ±7.6%, with 100% of held-out values landing inside the 95% band.

-1%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 →
12Projected 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 →
8.4–1595% 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 →
±7.6%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 stay roughly flat through 2029, near 12 (95% range 8.4–15). A 5-year backtest shows a typical error of ±7.6%, 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 →
2025128.215
2026128.315
2027128.315
2028128.415
2029128.415

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 Creek6620241992
Desolation6320071993
Silvies4720241994
Lakeview4720241996
Black Mtn.4620041993
Barnes Val4119871971
Mount Vernon4120241986
Hash Rock4120241983
Mt Hood4020241972
Barnhouse3920241998
Elkton3820241972
Hells Canyon3520221992
Clearwater3420211991
Secret Val3320221975
Summit Pr3320241980
Paisley2820241973
Silver Creek2820241984
Newbridge2820241992
Cinderella2620241993
Donelly 22620242018
Hazel Camp2520221975
Eagle Creek2520221993
Howard Mdws.2420241992
Wickiup2320241969

Western Tanager Population Trend in Other States

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