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

Osprey Population Trend in Massachusetts

All statesGeneralists

Osprey in Massachusetts has surged: up 986% on the route-weighted index since 1993.

+986%Since 1993
15Routes In State
27Years

Notable Osprey Trends in Massachusetts

long arc increasecomputed index

Osprey has surged in Massachusetts: up 985% on the route-weighted index since 1993.

Osprey Population Forecast in Massachusetts

If the recent trend holds, Osprey in Massachusetts is projected to fall about 27% by 2029 — from 0.93 in 2024 to a central estimate of 0.68 (95% range 0.30–1.1). A 5-year backtest shows a typical error of ±67.4%, with 40% of held-out values landing inside the 95% band.

-27%Change by 2029
0.68Projected 2029 index
0.30–1.195% range
±67.4%Backtest error
19792029
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
20250.620.231.00
20260.630.251.0
20270.650.271.0
20280.670.291.0
20290.680.301.1

Osprey Survey Routes in Massachusetts

Routes recording Osprey in Massachusetts.
Wellfleet 2820242016
Newburyport520212007
Gay Head320241996
N Oxford220162009
Warren 2220242016
E Dennis120211986
Marion120231979
Wellfleet120072005
Prattville120162002
Littleton120242016
Mansfield120212021
Cape Cod Ns120072007
Belchertown120192019
Warren120012001
N. Andover120222016

Osprey Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakentuckylouisianamainemarylandmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinaohiooregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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