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Species · Connecticut · BBS 2025 Release · 1966–2024

Warbling Vireo Population Trend in Connecticut

All statesForest birds

Warbling Vireo in Connecticut has surged: up 187% on the route-weighted index since 1968.

+187%Since 1968
20Routes In State
58Years

Notable Warbling Vireo Trends in Connecticut

long arc increasecomputed index

Warbling Vireo has surged in Connecticut: up 187% on the route-weighted index since 1968.

Warbling Vireo Population Forecast in Connecticut

If the recent trend holds, Warbling Vireo in Connecticut is projected to rise about 60% by 2029 — from 3.0 in 2024 to a central estimate of 4.8 (95% range 3.2–6.4). A 5-year backtest shows a typical error of ±54.2%, with 20% of held-out values landing inside the 95% band.

+60%Change by 2029
4.8Projected 2029 index
3.2–6.495% range
±54.2%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
20254.62.96.2
20264.63.06.3
20274.73.16.3
20284.73.16.4
20294.83.26.4

Warbling Vireo Survey Routes in Connecticut

Routes recording Warbling Vireo in Connecticut.
E Hartland1319921966
Long Hill1120191974
Willimantic920181977
Sherman620191973
Mid Haddam620241991
Woodstock 2620242017
Greenwich520181972
Granby520241989
Southington420241973
Uncasville320241977
Woodstock220071970
Westbrook220241980
Danbury220231971
Warren220111972
New Hartford219871972
New Hartford220221994
Mystic120231981
Buckingham120221967
No Woodbury120211967
Warren 2120242018

Warbling Vireo Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradodelawareidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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