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

Wilson's Warbler Population Trend in Oregon

All statesForest birds

Wilson's Warbler in Oregon has increased: up 32% on the route-weighted index since 1970.

+32%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 →
91Routes 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 Wilson's 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 Wilson's Warbler in Oregon. See the full index history below.

Wilson's Warbler Population Forecast in Oregon

If the recent trend holds, Wilson's Warbler in Oregon is projected to rise about 38% by 2029 — from 3.5 in 2024 to a central estimate of 4.8 (95% range 2.7–6.9). A 5-year backtest shows a typical error of ±35.6%, with 100% of held-out values landing inside the 95% band.

+38%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 →
4.8Projected 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 →
2.7–6.995% 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 →
±35.6%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, Wilson's Warbler in Oregon is projected to rise about 38% by 2029 — from 3.5 in 2024 to a central estimate of 4.8 (95% range 2.7–6.9). A 5-year backtest shows a typical error of ±35.6%, 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 →
20254.62.56.7
20264.72.66.8
20274.72.66.8
20284.82.76.8
20294.82.76.9

Wilson's Warbler Survey Routes in Oregon

Routes recording Wilson's 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 →
Fisher8520101997
Klickitat Mt7319961993
Waldport6120011992
Harlan 25420242011
Svensen4119921990
Nicolai Mtn.4120241993
Salado3720241968
Trask Summit3720241992
Harlan3220092006
Fisher 23120242017
Wedderburn2720241970
Coquille2720241994
Riley Peak2520161994
Timber2020171968
Glasgow2020241986
Hauser1419851970
Myrtle Grove920241992
Lorane620241993
Blue River520241992
Bull Run520242007
Logdell420241972
Hells Canyon420221996
Sandy River420061993
Molalla420241994
Scappoose420231996

Wilson's Warbler Population Trend in Other States

alaskacaliforniacoloradoidahomainemichiganminnesotamontananevadanew-hampshirenew-mexiconew-yorkutahvermontwashingtonwisconsinwyoming

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