BirdAnalyst
Species · New Hampshire · BBS 2026 Release · 1966–2025

American Crow Population Trend in New Hampshire

All statesGeneralists

American Crow in New Hampshire has risen sharply: up 55% on the route-weighted index since 1968.

+55%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 →
26Routes 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 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 →

American Crow has risen sharply in New Hampshire: up 55% on the route-weighted index since 1968.

American Crow Population Forecast in New Hampshire

If the recent trend holds, American Crow in New Hampshire is projected to rise about 55% by 2030 — from 19 in 2025 to a central estimate of 30 (95% range 20–40). A 5-year backtest shows a typical error of ±46.7%, with 40% of held-out values landing inside the 95% band.

+55%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 →
30Projected 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 →
20–4095% 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 →
±46.7%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 New Hampshire is projected to rise about 55% by 2030 — from 19 in 2025 to a central estimate of 30 (95% range 20–40). A 5-year backtest shows a typical error of ±46.7%, with 40% 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 →
2026292039
2027302039
2028302039
2029302039
2030302040

American Crow Survey Routes in New Hampshire

Routes recording American Crow 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 →
Clarksville5120251966
Stratford3520251966
Brentwood3419981966
Lempster3220251966
Jefferson Hl3220251966
Dixvil Notch3120171966
Dixville Notch 22420252018
Gilmantn I W2320251969
Milan2220251966
Glen2220251975
Strafford2120251966
Wilmot2120251966
East Kingston2120251999
Canterbury1920251966
Dover1820251966
Marlow1820251966
Walpole1420251966
Fitzwilliam1320251966
Hopkinton1220251966
Crawford Not1219751966
Concord1120251966
Mt Chocorua1020251967
Franconia920251966
Peterborough820251966
Jeffers Ntch820251993

American Crow Population Trend in Other States

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

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