BirdAnalyst
Species · Indiana · BBS 2026 Release · 1966–2025

Wood Thrush Population Trend in Indiana

All statesForest birds

Wood Thrush in Indiana has risen sharply: up 68% on the route-weighted index since 1968.

+68%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 →
68Routes 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 IndianaNotable 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 →

Wood Thrush has risen sharply in Indiana: up 68% on the route-weighted index since 1968.

Wood Thrush Population Forecast in Indiana

If the recent trend holds, Wood Thrush in Indiana is projected to fall about 22% by 2030 — from 6.7 in 2025 to a central estimate of 5.2 (95% range 3.4–7.0). A 5-year backtest shows a typical error of ±27.3%, with 60% of held-out values landing inside the 95% band.

-22%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 →
5.2Projected 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 →
3.4–7.095% 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 →
±27.3%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 Indiana is projected to fall about 22% by 2030 — from 6.7 in 2025 to a central estimate of 5.2 (95% range 3.4–7.0). A 5-year backtest shows a typical error of ±27.3%, with 60% 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 →
20265.03.26.9
20275.13.36.9
20285.13.36.9
20295.13.37.0
20305.23.47.0

Wood Thrush Survey Routes in Indiana

Routes recording Wood Thrush in Indiana.
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 →
Belmont5020241981
Hoosier3320251990
Georgia3020251999
Indian Spgs2820251982
Brookville2120251966
Celestine1920251979
New Phila1920251982
Cumback1720251966
Clear Spring1620251981
Cross Plains1520251999
Spencer1320241967
Azalia1320251982
Corydon1220251966
Vevay1020251966
Newberry920251999
Montpelier820242018
W Lafayette720251981
Evansville720191966
Cyprss720252000
Scottsburg620251982
Wallace520241999
Witts Station520252000
Galveston420251982
Sexton420231982
Milroy420211966

Wood Thrush Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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