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

Wood Thrush Population Trend in Connecticut

All statesForest birds

Wood Thrush in Connecticut has fallen sharply: down 52% on the route-weighted index since 1968.

-52%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 →
20Routes 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 ConnecticutNotable 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 declinecomputed 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 fallen sharply in Connecticut: down 52% on the route-weighted index since 1968.

Wood Thrush Population Forecast in Connecticut

If the recent trend holds, Wood Thrush in Connecticut is projected to stay roughly flat through 2029, near 7.0 (95% range 3.0–11). A 5-year backtest shows a typical error of ±16.7%, with 100% of held-out values landing inside the 95% band.

-0%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 →
7.0Projected 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 →
3.0–1195% 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 →
±16.7%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, Wood Thrush in Connecticut is projected to stay roughly flat through 2029, near 7.0 (95% range 3.0–11). A 5-year backtest shows a typical error of ±16.7%, 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 →
20257.83.812
20267.63.612
20277.43.411
20287.23.211
20297.03.011

Wood Thrush Survey Routes in Connecticut

Routes recording Wood Thrush in Connecticut.
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 →
Warren4420111972
Woodstock1720071968
E Hartland1319921966
Sherman1220191972
Warren 21220242012
Uncasville1120241973
New Hartford1119871972
Mystic1020231973
Mid Haddam920241973
Granby920241988
No Woodbury820241967
Danbury720231968
Woodstock 2720242016
Buckingham620221966
Willimantic620181967
Long Hill620191972
Southington320241973
Westbrook220241969
Greenwich220181967
New Hartford220241994

Wood Thrush Population Trend in Other States

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

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