BirdAnalyst
Species · Indiana · BBS 2025 Release · 1966–2024

Wood Thrush Population Trend in Indiana

All statesForest birds

Wood Thrush in Indiana has risen sharply: up 60% on the route-weighted index since 1968.

+60%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 →
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 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 60% 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 13% by 2029 — from 5.7 in 2024 to a central estimate of 5.0 (95% range 3.2–6.8). A 5-year backtest shows a typical error of ±24.4%, with 80% of held-out values landing inside the 95% band.

-13%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 →
5.0Projected 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 →
3.2–6.895% 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 →
±24.4%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 13% by 2029 — from 5.7 in 2024 to a central estimate of 5.0 (95% range 3.2–6.8). A 5-year backtest shows a typical error of ±24.4%, 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 →
20254.93.16.7
20264.93.16.7
20274.93.26.7
20285.03.26.7
20295.03.26.8

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
Hoosier3620241990
Indian Spgs2020241982
Georgia1920241999
Brookville1620241966
Cross Plains1620241999
Cumback1520211966
New Phila1520241982
Clear Spring1420241981
Spencer1320241967
Celestine1320241979
Corydon1320241966
Vevay1020241966
Azalia920241982
Montpelier820242018
Pimento720221981
Evansville720191966
W Lafayette620241981
Cyprss620242000
Shelbyville520241985
Wallace520241999
Monticello420241981
Galveston420241982
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 2026-05-22.