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

Yellow Warbler Population Trend in Oregon

All statesForest birds

Yellow Warbler in Oregon has held roughly steady: up 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 →
116Routes 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 Yellow Warbler 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 Yellow Warbler in Oregon. See the full index history below.

Yellow Warbler Population Forecast in Oregon

If the recent trend holds, Yellow Warbler in Oregon is projected to fall about 40% by 2030 — from 3.9 in 2025 to a central estimate of 2.3 (95% range 0.09–4.6). A 5-year backtest shows a typical error of ±30%, with 100% of held-out values landing inside the 95% band.

-40%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 →
2.3Projected 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 →
0.09–4.695% 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 →
±30%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, Yellow Warbler in Oregon is projected to fall about 40% by 2030 — from 3.9 in 2025 to a central estimate of 2.3 (95% range 0.09–4.6). A 5-year backtest shows a typical error of ±30%, 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 →
20262.50.234.7
20272.40.204.7
20282.40.164.6
20292.40.134.6
20302.30.094.6

Yellow Warbler Survey Routes in Oregon

Routes recording Yellow Warbler 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 →
Bridgeport3620251986
Fish Lake3020251972
Hells Canyon2920251992
Donelly 22920252018
Pendleton2220251972
Modoc Point 22220252024
Newbridge2220251993
Silver Creek1920251984
Logdell1820251971
Sparta1820251971
Troy1620251992
Imnaha1520251968
Modoc Point1420181969
Nicolai Mtn.1420251993
Mount Vernon1020241986
Joseph820251971
Summit Pr820251980
Adrian720211984
Ochoco619821972
Wickiup620251969
Twickenham620252011
Harlan 2620252022
Flora520232003
Princeton519851972
Hash Rock520251983

Yellow Warbler Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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