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

Red-bellied Woodpecker Population Trend in New Hampshire

All statesForest birds

Red-bellied Woodpecker in New Hampshire has surged: up 44× on the route-weighted index since 2004.

44×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 →
14Routes 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 →
22YearsYears 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 44× 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 23% by 2029 — from 2.9 in 2024 to a central estimate of 3.5 (95% range 2.7–4.4). A 5-year backtest shows a typical error of ±17.4%, with 80% of held-out values landing inside the 95% band.

+23%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 →
3.5Projected 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 →
2.7–4.495% 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 →
±17.4%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 23% by 2029 — from 2.9 in 2024 to a central estimate of 3.5 (95% range 2.7–4.4). A 5-year backtest shows a typical error of ±17.4%, with 80% of held-out values landing inside the 95% band.19972029
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 →
20253.02.13.8
20263.12.33.9
20273.22.44.1
20283.42.54.2
20293.52.74.4

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 →
Strafford1820241997
Canterbury1020242014
Dover920242004
East Kingston920242001
Peterborough520242005
Marlow420242012
Fitzwilliam220242012
Concord220242004
Gilmantn I W220242013
Hopkinton120242010
Epsom120232012
Wilmot120242024
Walpole120232014
Lempster120232016

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 2026-05-22.