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

Black-throated Blue Warbler Population Trend in Massachusetts

All statesForest birds

Black-throated Blue Warbler in Massachusetts has increased: up 49% on the route-weighted index since 1969.

+49%Since 1969
17Routes In State
57Years

Notable Black-throated Blue Warbler Trends in Massachusetts

No notable trend signals for Black-throated Blue Warbler in Massachusetts. See the full index history below.

Black-throated Blue Warbler Population Forecast in Massachusetts

If the recent trend holds, Black-throated Blue Warbler in Massachusetts is projected to rise about 85% by 2029 — from 0.87 in 2024 to a central estimate of 1.6 (95% range 0.72–2.5). A 5-year backtest shows a typical error of ±97.6%, with 60% of held-out values landing inside the 95% band.

+85%Change by 2029
1.6Projected 2029 index
0.72–2.595% range
±97.6%Backtest error
19672029
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
20251.60.672.4
20261.60.682.4
20271.60.702.5
20281.60.712.5
20291.60.722.5

Black-throated Blue Warbler Survey Routes in Massachusetts

Routes recording Black-throated Blue Warbler in Massachusetts.
Pittsfield2220161968
Cummington620141968
Monterey520242019
Chesterfield420241967
Ware River320221993
Hancock320151997
Cheshire219931982
Sheffield220131969
Cummington 2220242015
Maynard119701970
Princeton119741972
E Pepperell119701970
Belchertown120241978
S Barre120222014
N Orange120241969
Holden120081980
Warren 2120172017

Black-throated Blue Warbler Population Trend in Other States

connecticutgeorgiamainemarylandmichiganminnesotanew-hampshirenew-jerseynew-yorknorth-carolinapennsylvaniarhode-islandtennesseevermontvirginiawest-virginiawisconsin

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