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

Turkey Vulture Population Trend in New Hampshire

All statesGeneralists

Turkey Vulture in New Hampshire has surged: up 625% on the route-weighted index since 1984.

+625%Since 1984TrendPercent 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 →
23Routes 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 →
38YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Turkey Vulture 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Turkey Vulture has surged in New Hampshire: up 624% on the route-weighted index since 1984.

Turkey Vulture Population Forecast in New Hampshire

If the recent trend holds, Turkey Vulture in New Hampshire is projected to rise about 56% by 2029 — from 0.68 in 2024 to a central estimate of 1.1 (95% range 0.36–1.8). A 5-year backtest shows a typical error of ±190.1%, with 40% 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 →
1.1Projected 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 →
0.36–1.895% 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 →
±190.1%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, Turkey Vulture in New Hampshire is projected to rise about 56% by 2029 — from 0.68 in 2024 to a central estimate of 1.1 (95% range 0.36–1.8). A 5-year backtest shows a typical error of ±190.1%, with 40% of held-out values landing inside the 95% band.19752029
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 →
20250.960.261.7
20260.990.291.7
20271.00.311.7
20281.00.341.7
20291.10.361.8

Turkey Vulture Survey Routes in New Hampshire

Routes recording Turkey Vulture 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 →
Milan1020241991
Marlow420221975
Peterborough220241999
Dover220192014
Epsom220221989
Concord220221984
Strafford220012001
Canterbury220191996
East Kingston220162016
Fitzwilliam120241982
Hopkinton120211984
Gilmantn I W120192002
Wilmot120121994
Mt Chocorua120022000
Walpole120241982
Lempster120172001
Jefferson Hl120172017
Franconia120071993
Stratford120042004
Dixvil Notch119931993
Clarksville120182018
Glen120242000
Jeffers Ntch120192019

Turkey Vulture Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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