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Species · BCR 3 · BBS 2025 Release · 1966–2024

Wilson's Warbler In BCR 3

All regionsBCR 3Forest birds

Wilson's Warbler in BCR 3 has risen sharply: up 59% on the route-weighted index since 1998.

+59%Since 1998TrendPercent 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 →
4Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
21YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Wilson's Warbler has risen sharply in BCR 3: up 59% on the route-weighted index since 1998.

Wilson's Warbler In BCR 3 Population Forecast

If the recent trend holds, Wilson's Warbler in BCR 3 is projected to fall about 39% by 2029 — from 3.8 in 2024 to a central estimate of 2.3 (95% range 0.56–4.0). A 5-year backtest shows a typical error of ±29.7%, with 80% of held-out values landing inside the 95% band.

-39%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 →
2.3Projected 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 →
0.56–4.095% 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 →
±29.7%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 BCR 3 is projected to fall about 39% by 2029 — from 3.8 in 2024 to a central estimate of 2.3 (95% range 0.56–4.0). A 5-year backtest shows a typical error of ±29.7%, with 80% of held-out values landing inside the 95% band.19962029
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 →
20252.20.433.9
20262.20.463.9
20272.20.493.9
20282.30.534.0
20292.30.564.0

Routes In BCR 3

Routes recording Wilson's Warbler in BCR 3.
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 →
Dietrich CmpALASKA72024
Red DogALASKA42024
Happy ValleyALASKA32024
Galbraith L.ALASKA12024

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