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

American Crow Population Trend in New Hampshire

All statesGeneralists

American Crow in New Hampshire has risen sharply: up 65% on the route-weighted index since 1968.

+65%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 →
58YearsYears 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 65% 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 39% by 2029 — from 22 in 2024 to a central estimate of 31 (95% range 21–40). A 5-year backtest shows a typical error of ±51.3%, with 0% of held-out values landing inside the 95% band.

+39%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 →
31Projected 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 →
21–4095% 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 →
±51.3%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, American Crow in New Hampshire is projected to rise about 39% by 2029 — from 22 in 2024 to a central estimate of 31 (95% range 21–40). A 5-year backtest shows a typical error of ±51.3%, with 0% 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 →
2025302139
2026302139
2027302140
2028312140
2029312140

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 →
Lempster4220241966
Clarksville3620241966
Wilmot3520241966
Brentwood3419981966
Dover3220241966
Jefferson Hl3220241966
Dixvil Notch3120171966
Stratford2820241966
Glen2820241975
Dixville Notch 22820242018
Strafford2520241966
Marlow2420241966
Milan2220241966
East Kingston2020241999
Canterbury1920241966
Fitzwilliam1820241966
Gilmantn I W1820241969
Concord1720241966
Walpole1420241966
Franconia1420241966
Hopkinton1220241966
Epsom1220231966
Crawford Not1219751966
Peterborough1120241966
Mt Chocorua720241967

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 2026-05-22.