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

Blackburnian Warbler Population Trend in Massachusetts

All statesForest birds

Blackburnian Warbler in Massachusetts has surged: up 208% on the route-weighted index since 1968.

+208%Since 1968
19Routes In State
58Years

Notable Blackburnian Warbler Trends in Massachusetts

long arc increasecomputed index

Blackburnian Warbler has surged in Massachusetts: up 208% on the route-weighted index since 1968.

Blackburnian Warbler Population Forecast in Massachusetts

If the recent trend holds, Blackburnian Warbler in Massachusetts is projected to rise about 57% by 2029 — from 1.2 in 2024 to a central estimate of 1.9 (95% range 1.0–2.7). A 5-year backtest shows a typical error of ±74.4%, with 40% of held-out values landing inside the 95% band.

+57%Change by 2029
1.9Projected 2029 index
1.0–2.795% range
±74.4%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
20251.80.942.6
20261.80.962.7
20271.80.992.7
20281.91.02.7
20291.91.02.7

Blackburnian Warbler Survey Routes in Massachusetts

Routes recording Blackburnian Warbler in Massachusetts.
Pittsfield1420161969
Cummington920141968
Chesterfield720241967
Sheffield520221971
Cummington 2420242015
N Orange320241968
Hancock320151997
Princeton219761970
Belchertown220241973
Warren219841975
Monterey220242019
Holden219891977
Marion119931993
Ware River120221994
Littleton119721972
E Pepperell119881966
S Barre120211978
Cheshire119921971
Warren 2120112011

Blackburnian Warbler Population Trend in Other States

connecticutgeorgiaindianamainemarylandmichiganminnesotanew-hampshirenew-jerseynew-yorknorth-carolinaohiopennsylvaniarhode-islandtennesseevermontvirginiawest-virginiawisconsin

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