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

Wood Thrush Population Trend in Connecticut

All statesForest birds

Wood Thrush in Connecticut has declined: down 50% on the route-weighted index since 1968.

-50%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 →
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 ConnecticutNotable 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 Connecticut. See the full index history below.

Wood Thrush Population Forecast in Connecticut

If the recent trend holds, Wood Thrush in Connecticut is projected to fall about 36% by 2030 — from 11 in 2025 to a central estimate of 7.0 (95% range 3.0–11). A 5-year backtest shows a typical error of ±20.7%, with 100% of held-out values landing inside the 95% band.

-36%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 →
7.0Projected 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 →
3.0–1195% 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 →
±20.7%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 fall about 36% by 2030 — from 11 in 2025 to a central estimate of 7.0 (95% range 3.0–11). A 5-year backtest shows a typical error of ±20.7%, 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 →
20267.83.812
20277.63.612
20287.43.411
20297.23.211
20307.03.011

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
Uncasville2120251973
Woodstock1720071968
No Woodbury1520251967
Woodstock 21520252016
E Hartland1319921966
Mid Haddam1320251973
Granby1320251988
Sherman1220191972
New Hartford1119871972
Mystic1020231973
Danbury720231968
Warren 2720252012
Buckingham620221966
Willimantic620181967
Long Hill620191972
Greenwich220181967
Southington220251973
New Hartford220241994
Westbrook120251969

Wood Thrush Population Trend in Other States

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

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