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

Hairy Woodpecker Population Trend in New Hampshire

All statesForest birds

Hairy Woodpecker in New Hampshire has surged: up 93% on the route-weighted index since 1968.

+93%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 Hairy Woodpecker 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 →

Hairy Woodpecker has surged in New Hampshire: up 93% on the route-weighted index since 1968.

Hairy Woodpecker Population Forecast in New Hampshire

If the recent trend holds, Hairy Woodpecker in New Hampshire is projected to rise about 59% by 2030 — from 1.7 in 2025 to a central estimate of 2.6 (95% range 2.0–3.3). A 5-year backtest shows a typical error of ±23.9%, with 60% of held-out values landing inside the 95% band.

+59%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 →
2.6Projected 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 →
2.0–3.395% 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 →
±23.9%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, Hairy Woodpecker in New Hampshire is projected to rise about 59% by 2030 — from 1.7 in 2025 to a central estimate of 2.6 (95% range 2.0–3.3). A 5-year backtest shows a typical error of ±23.9%, with 60% 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 →
20262.51.93.2
20272.61.93.2
20282.61.93.3
20292.61.93.3
20302.62.03.3

Hairy Woodpecker Survey Routes in New Hampshire

Routes recording Hairy Woodpecker 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 →
Epsom620251966
Dixvil Notch520161966
Mt Chocorua420251969
Marlow420241966
Clarksville420241971
Jeffers Ntch420191995
Concord320251967
Canterbury320251966
Lempster320251967
Glen320251975
Peterborough220251967
Hopkinton220221966
Gilmantn I W220251969
Franconia220251966
Stratford220221966
Dixville Notch 2220252018
Brentwood119941966
Fitzwilliam120251968
Dover120251966
Strafford120251966
Wilmot120251969
Walpole120251968
Crawford Not119751968
Jefferson Hl120251966
Milan120251968

Hairy Woodpecker 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.