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Species · Connecticut · BBS 2025 Release · 1966–2024

Blackburnian Warbler Population Trend in Connecticut

All statesForest birds

Blackburnian Warbler in Connecticut has held roughly steady: down 9% on the route-weighted index since 1970.

-9%Since 1970
12Routes In State
52Years

Notable Blackburnian Warbler Trends in Connecticut

No notable trend signals for Blackburnian Warbler in Connecticut. See the full index history below.

Blackburnian Warbler Population Forecast in Connecticut

If the recent trend holds, Blackburnian Warbler in Connecticut is projected to rise about 160% by 2029 — from 0.11 in 2024 to a central estimate of 0.29 (95% range 0.00–0.64). A 5-year backtest shows a typical error of ±89.8%, with 100% of held-out values landing inside the 95% band.

+160%Change by 2029
0.29Projected 2029 index
0.00–0.6495% range
±89.8%Backtest error
19682029
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
20250.280.000.63
20260.290.000.63
20270.290.000.64
20280.290.000.64
20290.290.000.64

Blackburnian Warbler Survey Routes in Connecticut

Routes recording Blackburnian Warbler in Connecticut.
Warren420111972
Granby320231989
Woodstock219951968
Long Hill220192005
New Hartford219871985
E Hartland119851985
New Hartford120231995
Willimantic120071971
No Woodbury119771977
Woodstock 2120182018
Danbury119721972
Warren 2120242022

Blackburnian Warbler Population Trend in Other States

georgiaindianamainemarylandmassachusettsmichiganminnesotanew-hampshirenew-jerseynew-yorknorth-carolinaohiopennsylvaniarhode-islandtennesseevermontvirginiawest-virginiawisconsin

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