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Species · Massachusetts · BBS 2025 Release · 1966–2024

Bobolink Population Trend in Massachusetts

All statesGrassland birds

Bobolink in Massachusetts has declined: down 44% on the route-weighted index since 1968.

-44%Since 1968
26Routes In State
58Years

Notable Bobolink Trends in Massachusetts

No notable trend signals for Bobolink in Massachusetts. See the full index history below.

Bobolink Population Forecast in Massachusetts

If the recent trend holds, Bobolink in Massachusetts is projected to rise about 22% by 2029 — from 2.8 in 2024 to a central estimate of 3.4 (95% range 1.1–5.7). A 5-year backtest shows a typical error of ±118.5%, with 60% of held-out values landing inside the 95% band.

+22%Change by 2029
3.4Projected 2029 index
1.1–5.795% range
±118.5%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
20253.51.25.8
20263.51.25.7
20273.41.25.7
20283.41.25.7
20293.41.15.7

Bobolink Survey Routes in Massachusetts

Routes recording Bobolink in Massachusetts.
Chesterfield2320241967
Princeton1019761969
Cheshire1019941969
Warren820091968
Pittsfield820161967
Monterey820242019
Cummington620141968
Belchertown420241967
Cummington 2420242015
Hancock320151997
Marion220191966
Littleton220151967
Mansfield219901973
E Pepperell219921966
Warren 2220192010
Ware River120221993
Prattville119981975
Brockton119711969
Newburyport120221967
Maynard120211968
N Oxford120071969
S Barre120241968
N Orange120241969
Sheffield120221969
Holden120241977

Bobolink Population Trend in Other States

californiacoloradoconnecticutidahoillinoisindianaiowakansaskentuckymainemarylandmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotautahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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