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

Black-throated Green Warbler Population Trend in West Virginia

All statesForest birds

Black-throated Green Warbler in West Virginia has surged: up 381% on the route-weighted index since 1968.

+381%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 →
47Routes 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 →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Black-throated Green 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 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 →

Black-throated Green Warbler has surged in West Virginia: up 381% on the route-weighted index since 1968.

Black-throated Green Warbler Population Forecast in West Virginia

If the recent trend holds, Black-throated Green Warbler in West Virginia is projected to stay roughly flat through 2029, near 4.1 (95% range 2.3–5.9). A 5-year backtest shows a typical error of ±43.8%, with 80% of held-out values landing inside the 95% band.

+10%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 →
4.1Projected 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 →
2.3–5.995% 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 →
±43.8%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, Black-throated Green Warbler in West Virginia is projected to stay roughly flat through 2029, near 4.1 (95% range 2.3–5.9). A 5-year backtest shows a typical error of ±43.8%, with 80% 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 →
20253.82.15.6
20263.92.15.7
20274.02.25.8
20284.02.25.8
20294.12.35.9

Black-throated Green Warbler Survey Routes in West Virginia

Routes recording Black-throated Green 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 →
Bemis2920242001
Glade Run 22820242003
Wymer2720151995
Glade Run1720021988
Glady1520242001
Richwood1420241980
Green Bank1320241977
Dailey620241973
Three Forks520241975
Albright519741966
Stollings420211994
Ghent420241978
Bowden420241993
Yawkey420112007
Denmar420241980
Meadowville420241972
Ruthbelle420241975
Valley Head320241966
Mo Of Seneca320232008
Pedro220241986
Bramwell220232003
Clear Creek220221995
Bismark220231977
Hix120012001
Smoot120221998

Black-throated Green Warbler Population Trend in Other States

alabamaarkansasconnecticutgeorgiaindianakentuckymainemarylandmassachusettsmichiganminnesotamissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseevermontvirginiawisconsin

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