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

Yellow Warbler Population Trend in Oregon

All statesForest birds

Yellow Warbler in Oregon has held roughly steady: down 6% on the route-weighted index since 1970.

-6%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 →
113Routes 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 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 34% by 2029 — from 3.4 in 2024 to a central estimate of 2.2 (95% range 0.02–4.5). A 5-year backtest shows a typical error of ±30.4%, with 100% of held-out values landing inside the 95% band.

-34%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 →
2.2Projected 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 →
0.02–4.595% 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 →
±30.4%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, Yellow Warbler in Oregon is projected to fall about 34% by 2029 — from 3.4 in 2024 to a central estimate of 2.2 (95% range 0.02–4.5). A 5-year backtest shows a typical error of ±30.4%, 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 →
20252.40.184.6
20262.40.144.6
20272.30.104.5
20282.30.064.5
20292.20.024.5

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 →
Logdell3920241971
Hells Canyon3520221992
Bridgeport3220221986
Fish Lake3120241972
Newbridge3020241993
Donelly 22620242018
Nicolai Mtn.2520241993
Pendleton2220241972
Silver Creek2120241984
Troy1620241992
Modoc Point1420181969
Modoc Point 21220242024
Sparta1020011971
Mount Vernon1020241986
Adair820241972
Eagle Creek820221993
Adrian720211984
Imnaha620241968
Ochoco619821972
Summit Pr620241980
Flora520232003
Princeton519851972
Twickenham520242011
Molalla520241996
Wickiup420241969

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 2026-05-22.