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

Field Sparrow Population Trend in West Virginia

All statesGeneralists

Field Sparrow in West Virginia has declined: down 49% on the route-weighted index since 1968.

-49%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 →
63Routes 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 Field Sparrow 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 Field Sparrow in West Virginia. See the full index history below.

Field Sparrow Population Forecast in West Virginia

If the recent trend holds, Field Sparrow in West Virginia is projected to fall about 25% by 2029 — from 6.2 in 2024 to a central estimate of 4.7 (95% range 1.6–7.7). A 5-year backtest shows a typical error of ±25.2%, with 100% of held-out values landing inside the 95% band.

-25%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 →
4.7Projected 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 →
1.6–7.795% 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 →
±25.2%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, Field Sparrow in West Virginia is projected to fall about 25% by 2029 — from 6.2 in 2024 to a central estimate of 4.7 (95% range 1.6–7.7). A 5-year backtest shows a typical error of ±25.2%, 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 →
20255.22.28.3
20265.12.18.1
20274.91.98.0
20284.81.87.8
20294.71.67.7

Field Sparrow Survey Routes in West Virginia

Routes recording Field Sparrow 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 →
Bebee2320241972
Mt Storm2119751966
Shanghai2020221995
Hix1920241970
Mcdonald1920231987
Martinsburg1820241966
Lost River1720231996
Moundsville1520241972
Washburn1420221974
Spencer1320231986
Nicut1320241986
Pedro1120241979
Green Bank1120241977
Slate1120241980
Yellow Spg1120231972
Rio1119951974
Ruthbelle1120241975
Berryburg1019961975
Pt Pleasant920231973
Denmar920241980
Albright919741966
Smoot820241980
Valley Head820241966
Josephs Mill820241993
Bismark820231976

Field Sparrow Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawisconsinwyoming

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