BirdAnalyst
Species · West Virginia · BBS 2025 Release · 1966–2024

Pine Warbler Population Trend in West Virginia

All statesForest birds

Pine Warbler in West Virginia has fallen sharply: down 65% on the route-weighted index since 1968.

-65%Since 1968TrendPercent 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 →
24Routes 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 Pine Warbler Trends in West VirginiaNotable 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 declinecomputed 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 →

Pine Warbler has fallen sharply in West Virginia: down 65% on the route-weighted index since 1968.

Pine Warbler Population Forecast in West Virginia

If the recent trend holds, Pine Warbler in West Virginia is projected to stay roughly flat through 2029, near 0.18 (95% range 0.00–0.44). A 5-year backtest shows a typical error of ±201.2%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.18Projected 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 →
0.00–0.4495% 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 →
±201.2%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, Pine Warbler in West Virginia is projected to stay roughly flat through 2029, near 0.18 (95% range 0.00–0.44). A 5-year backtest shows a typical error of ±201.2%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20250.190.000.44
20260.190.000.44
20270.190.000.44
20280.180.000.44
20290.180.000.44

Pine Warbler Survey Routes in West Virginia

Routes recording Pine Warbler in West Virginia.
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 →
Wymer420142004
Sleepy Creek419901966
Shanghai320221995
Mo Of Seneca220091976
Yellow Spg220221975
Ruthbelle220032003
Henderson220052003
Hix120121995
Pedro120231979
Pt Pleasant120052005
Hubbardstown120232017
Paradise120122012
Yawkey119771977
Olcott120181995
Lost River120231997
Valley Head120041975
Sutton120222022
Denmar120221991
Strange Crk119931992
Green Bank120241981
Sugar Grove120051977
Slate120081982
Washburn120221975
Rio119891980

Pine Warbler Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianakentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawisconsin

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