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Species · Pennsylvania · BBS 2026 Release · 1966–2025

Wood Thrush Population Trend in Pennsylvania

All statesForest birds

Wood Thrush in Pennsylvania has edged down: down 23% on the route-weighted index since 1968.

-23%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 →
136Routes 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 →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Wood Thrush Trends in PennsylvaniaNotable 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 Wood Thrush in Pennsylvania. See the full index history below.

Wood Thrush Population Forecast in Pennsylvania

If the recent trend holds, Wood Thrush in Pennsylvania is projected to fall about 18% by 2030 — from 10 in 2025 to a central estimate of 8.5 (95% range 5.1–12). A 5-year backtest shows a typical error of ±9.2%, with 100% of held-out values landing inside the 95% band.

-18%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 →
8.5Projected 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 →
5.1–1295% 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 →
±9.2%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, Wood Thrush in Pennsylvania is projected to fall about 18% by 2030 — from 10 in 2025 to a central estimate of 8.5 (95% range 5.1–12). A 5-year backtest shows a typical error of ±9.2%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20269.05.612
20278.95.512
20288.85.312
20298.75.212
20308.55.112

Wood Thrush Survey Routes in Pennsylvania

Routes recording Wood Thrush in Pennsylvania.
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 →
Pine Gr Mill3320251967
Landisburg3220251978
Stoneybreak3120251992
Jefferson3020251966
Laurel Hill3020251978
Tussey Mtn.2920251993
Mawr Glen2820251966
Rector2419771966
Mill Run2320251978
Harrisville2220251995
Duvall2120211974
Big Flat2119811966
Mars2120251989
Broad Mtn.2120251993
Carsonville2020231966
Drehersville 22020252000
Roulette1920211970
Needmore1919911966
Ellenton1820251982
Chatham1820251997
Beaver1720251969
Rush1620251970
Canadensis1620251969
Akeley1519791966
Sigel1520251981

Wood Thrush Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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