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

Red-bellied Woodpecker Population Trend in New Hampshire

All statesForest birds

Red-bellied Woodpecker in New Hampshire has surged: up 47× on the route-weighted index since 2004.

47×Since 2004TrendPercent 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 →
15Routes 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 →
23YearsYears 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-bellied 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 →

Red-bellied Woodpecker has surged in New Hampshire: up 47× on the route-weighted index since 2004.

Red-bellied Woodpecker Population Forecast in New Hampshire

If the recent trend holds, Red-bellied Woodpecker in New Hampshire is projected to rise about 14% by 2030 — from 3.2 in 2025 to a central estimate of 3.7 (95% range 2.9–4.5). A 5-year backtest shows a typical error of ±6.2%, with 100% of held-out values landing inside the 95% band.

+14%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 →
3.7Projected 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 →
2.9–4.595% 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 →
±6.2%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-bellied Woodpecker in New Hampshire is projected to rise about 14% by 2030 — from 3.2 in 2025 to a central estimate of 3.7 (95% range 2.9–4.5). A 5-year backtest shows a typical error of ±6.2%, with 100% of held-out values landing inside the 95% band.19972030
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 →
20263.12.34.0
20273.32.44.1
20283.42.64.2
20293.52.74.4
20303.72.94.5

Red-bellied Woodpecker Survey Routes in New Hampshire

Routes recording Red-bellied 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 →
Dover1520252004
East Kingston1020252001
Strafford820251997
Canterbury820252014
Walpole720252014
Fitzwilliam520252012
Marlow520252012
Hopkinton420252010
Concord420252004
Gilmantn I W420252013
Peterborough320252005
Epsom120242012
Wilmot120242024
Lempster120232016
Glen120252025

Red-bellied Woodpecker Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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