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Species · Connecticut · BBS 2025 Release · 1966–2024

Yellow Warbler Population Trend in Connecticut

All statesForest birds

Yellow Warbler in Connecticut has surged: up 103% on the route-weighted index since 1968.

+103%Since 1968
20Routes In State
58Years

Notable Yellow Warbler Trends in Connecticut

long arc increasecomputed index

Yellow Warbler has surged in Connecticut: up 103% on the route-weighted index since 1968.

Yellow Warbler Population Forecast in Connecticut

If the recent trend holds, Yellow Warbler in Connecticut is projected to rise about 28% by 2029 — from 10 in 2024 to a central estimate of 13 (95% range 5.2–21). A 5-year backtest shows a typical error of ±90.7%, with 60% of held-out values landing inside the 95% band.

+28%Change by 2029
13Projected 2029 index
5.2–2195% range
±90.7%Backtest error
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 index95% low95% high
2025134.921
2026134.921
2027135.021
2028135.121
2029135.221

Yellow Warbler Survey Routes in Connecticut

Routes recording Yellow Warbler in Connecticut.
Warren7220111972
Woodstock3520071968
Willimantic2620181967
Woodstock 22520242016
Uncasville2320241973
Sherman1620191972
New Hartford1419871972
Mid Haddam1220241973
Long Hill1020191972
Warren 21020242012
No Woodbury920241967
Granby820241988
E Hartland719921966
Buckingham620221967
Southington320241973
Westbrook220241969
Mystic120231973
Greenwich120181967
Danbury120231968
New Hartford120241994

Yellow Warbler Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradodelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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