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

Blue Grosbeak Population Trend in West Virginia

All statesGeneralists

Blue Grosbeak in West Virginia has declined: down 28% on the route-weighted index since 1975.

-28%Since 1975TrendPercent 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 →
22Routes 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 →
46YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Blue Grosbeak 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 →

No notable trend signals for Blue Grosbeak in West Virginia. See the full index history below.

Blue Grosbeak Population Forecast in West Virginia

If the recent trend holds, Blue Grosbeak in West Virginia is projected to fall about 48% by 2029 — from 0.14 in 2024 to a central estimate of 0.07 (95% range 0.00–0.21). A 5-year backtest shows a typical error of ±49.7%, with 100% of held-out values landing inside the 95% band.

-48%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 →
0.07Projected 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 →
0.00–0.2195% 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 →
±49.7%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, Blue Grosbeak in West Virginia is projected to fall about 48% by 2029 — from 0.14 in 2024 to a central estimate of 0.07 (95% range 0.00–0.21). A 5-year backtest shows a typical error of ±49.7%, with 100% of held-out values landing inside the 95% band.19722029
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 →
20250.070.000.21
20260.070.000.21
20270.070.000.21
20280.070.000.21
20290.070.000.21

Blue Grosbeak Survey Routes in West Virginia

Routes recording Blue Grosbeak 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 →
Paradise420091976
Meadowville319931986
Martinsburg320241973
Lost River220142014
Henderson220212021
Hix119841977
Smoot119861986
Pedro120211997
Hanover120242024
Pt Pleasant119951993
Spencer120182004
Shanghai120192014
Cedarville120112011
Strange Crk120132013
Richwood120241981
Sugar Grove120191972
Mo Of Seneca119761972
Slate120182018
Mcdonald119911988
Yellow Spg120141975
Rio119831976
Sleepy Creek119821982

Blue Grosbeak Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradodelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamarylandminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvirginiawyoming

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