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Species · Massachusetts · BBS 2026 Release · 1966–2025

American Crow Population Trend in Massachusetts

All statesGeneralists

American Crow in Massachusetts has increased: up 26% on the route-weighted index since 1968.

+26%Since 1968TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
32Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable American Crow Trends in MassachusettsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

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

American Crow Population Forecast in Massachusetts

If the recent trend holds, American Crow in Massachusetts is projected to rise about 37% by 2030 — from 20 in 2025 to a central estimate of 27 (95% range 12–42). A 5-year backtest shows a typical error of ±51.9%, with 100% of held-out values landing inside the 95% band.

+37%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
27Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
12–4295% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±51.9%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, American Crow in Massachusetts is projected to rise about 37% by 2030 — from 20 in 2025 to a central estimate of 27 (95% range 12–42). A 5-year backtest shows a typical error of ±51.9%, with 100% of held-out values landing inside the 95% band.19662030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
2026271242
2027271242
2028271242
2029271242
2030271242

American Crow Survey Routes in Massachusetts

Routes recording American Crow in Massachusetts.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Cheshire6719941969
Belchertown6620251967
Pittsfield5120161967
E Pepperell3819941966
Cape Cod Ns3420071989
Wellfleet 23420252016
Brockton3320191967
Chilmark2919831969
Princeton2719761969
Littleton2620251967
Chesterfield2620251967
Newburyport2520221967
Wellfleet2420071966
E Dennis2020211967
Gay Head1920251996
S Barre1820251968
Monterey1820252019
N. Andover1720251995
Marion1620251966
Mansfield1520251968
Holden1420251977
Maynard1320251967
Hancock1320151997
N Oxford1120251968
N Orange1020251968

American Crow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.