BirdAnalyst
Species · New Hampshire · BBS 2025 Release · 1966–2024

Red-shouldered Hawk Population Trend in New Hampshire

All statesGeneralists

Red-shouldered Hawk in New Hampshire has edged up: up 13% on the route-weighted index since 1968.

+13%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 →
21Routes 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 →
43YearsYears 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 New HampshireNotable 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 New Hampshire. See the full index history below.

Red-shouldered Hawk Population Forecast in New Hampshire

If the recent trend holds, Red-shouldered Hawk in New Hampshire is projected to fall about 56% by 2029 — from 0.23 in 2024 to a central estimate of 0.10 (95% range 0.00–0.27). A 5-year backtest shows a typical error of ±64.3%, with 60% of held-out values landing inside the 95% band.

-56%Change by 2029TrendPercent 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 →
0.10Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.2795% 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 →
±64.3%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 New Hampshire is projected to fall about 56% by 2029 — from 0.23 in 2024 to a central estimate of 0.10 (95% range 0.00–0.27). A 5-year backtest shows a typical error of ±64.3%, with 60% of held-out values landing inside the 95% band.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 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 →
20250.100.000.27
20260.100.000.27
20270.100.000.27
20280.100.000.27
20290.100.000.27

Red-shouldered Hawk Survey Routes in New Hampshire

Routes recording Red-shouldered Hawk in New Hampshire.
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 →
Hopkinton220241979
Peterborough120211970
Brentwood119921966
Fitzwilliam120231982
Dover120241966
Epsom119881977
Concord119791969
Strafford120231966
Canterbury120221968
Gilmantn I W119961996
Wilmot120011977
Mt Chocorua120221970
Walpole120242024
Marlow120172005
Lempster119751974
Jefferson Hl119771977
Franconia120081968
Milan119741974
Stratford120132013
Dixvil Notch119831983
East Kingston120242001

Red-shouldered Hawk Population Trend in Other States

alabamaarkansascaliforniaconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-jerseynew-yorknorth-carolinaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawashingtonwest-virginiawisconsin

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