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

Black-and-white Warbler Population Trend in Connecticut

All statesForest birds

Black-and-white Warbler in Connecticut has declined: down 42% on the route-weighted index since 1968.

-42%Since 1968
20Routes In State
58Years

Notable Black-and-white Warbler Trends in Connecticut

No notable trend signals for Black-and-white Warbler in Connecticut. See the full index history below.

Black-and-white Warbler Population Forecast in Connecticut

If the recent trend holds, Black-and-white Warbler in Connecticut is projected to fall about 14% by 2029 — from 2.1 in 2024 to a central estimate of 1.8 (95% range 0.00–3.7). A 5-year backtest shows a typical error of ±38.9%, with 100% of held-out values landing inside the 95% band.

-14%Change by 2029
1.8Projected 2029 index
0.00–3.795% range
±38.9%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
20251.90.083.8
20261.90.053.8
20271.90.023.7
20281.90.003.7
20291.80.003.7

Black-and-white Warbler Survey Routes in Connecticut

Routes recording Black-and-white Warbler in Connecticut.
Warren2520111972
Granby820241988
E Hartland519921967
New Hartford519871972
Woodstock 2520242016
Woodstock420071968
Willimantic420181967
Warren 2320242012
Mystic220041973
No Woodbury220221967
Danbury220131968
New Hartford220241994
Buckingham120051966
Uncasville120211973
Westbrook119981969
Sherman120151973
Greenwich119971967
Long Hill120191972
Mid Haddam120241973
Southington120191973

Black-and-white Warbler Population Trend in Other States

alabamaarkansascaliforniadelawaregeorgiaillinoisindianakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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