BirdAnalyst
Species · BCR 9 · BBS 2026 Release · 1966–2025

Wilson's Warbler In Great Basin

All regionsGreat BasinForest birds

Wilson's Warbler in Great Basin 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 →
110Routes 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 →
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 SignalsNotable 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 Great Basin. See the full index history below.

Wilson's Warbler In Great Basin Population Forecast

If the recent trend holds, Wilson's Warbler in Great Basin is projected to rise about 68% by 2030 — from 0.23 in 2025 to a central estimate of 0.39 (95% range 0.10–0.67). A 5-year backtest shows a typical error of ±25.1%, with 100% of held-out values landing inside the 95% band.

+68%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 →
0.39Projected 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 →
0.10–0.6795% 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 →
±25.1%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 Great Basin is projected to rise about 68% by 2030 — from 0.23 in 2025 to a central estimate of 0.39 (95% range 0.10–0.67). A 5-year backtest shows a typical error of ±25.1%, 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 →
20260.380.100.67
20270.380.100.67
20280.380.100.67
20290.390.100.67
20300.390.100.67

Routes In Great Basin

Routes recording Wilson's Warbler in Great Basin.
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 →
KendallWASHINGTON182025
Ruby ValleyNEVADA142000
LeavenworthWASHINGTON82015
Iron GateCALIFORNIA42011
Lake ChelanWASHINGTON42025
BodieCALIFORNIA32011
DorrisCALIFORNIA32011
TionestaCALIFORNIA32004
JosephOREGON32014
PendletonOREGON32011
Badger CreekOREGON32006
Goose Creek Mtn.UTAH32007
NewcastleUTAH32022
SnowdenWASHINGTON32025
GlacierWASHINGTON32024
Crowley LakeCALIFORNIA22004
Deep SpringsCALIFORNIA22011
SquirrelIDAHO21977
PicaboIDAHO22013
AustinNEVADA22016
Mt HoodOREGON22025
AdrianOREGON22021
MerrillOREGON22006
LynnUTAH22011
IndexWASHINGTON21971

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