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

Red-shouldered Hawk Population Trend in Maine

All statesGeneralists

Red-shouldered Hawk in Maine has edged down: down 12% on the route-weighted index since 1976.

-12%Since 1976TrendPercent 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 →
20Routes 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 →
18YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Red-shouldered Hawk Trends in MaineNotable 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 Red-shouldered Hawk in Maine. See the full index history below.

Red-shouldered Hawk Population Forecast in Maine

If the recent trend holds, Red-shouldered Hawk in Maine is projected to stay roughly flat through 2027, near 0.06 (95% range 0.00–0.19). A 5-year backtest shows a typical error of ±87%, with 80% of held-out values landing inside the 95% band.

n/aChange by 2027TrendPercent 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 →
0.06Projected 2027 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1995% 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 →
±87%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, Red-shouldered Hawk in Maine is projected to stay roughly flat through 2027, near 0.06 (95% range 0.00–0.19). A 5-year backtest shows a typical error of ±87%, with 80% of held-out values landing inside the 95% band.19712027
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 →
20230.060.000.19
20240.060.000.19
20250.060.000.19
20260.060.000.19
20270.060.000.19

Red-shouldered Hawk Survey Routes in Maine

Routes recording Red-shouldered Hawk in Maine.
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 →
Manchester419731973
Harmony320212021
Aurora220212019
Carrying Pl220012001
Charleston220142014
Cape Neddick119931992
Wilson Mills119841984
Nesowadnehun119961996
Turner119731973
Greenwood120172017
Reeds120212008
South Arm119991992
Bowdoin Ctr120112011
Freedom119961996
Benton119711971
Northfield119771977
Cambridge119761976
Medway119931993
Cornville120122012
Searsport120222022

Red-shouldered Hawk Population Trend in Other States

alabamaarkansascaliforniaconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawashingtonwest-virginiawisconsin

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