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

White-breasted Nuthatch Population Trend in New Hampshire

All statesForest birds

White-breasted Nuthatch in New Hampshire has surged: up 208% on the route-weighted index since 1968.

+208%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 White-breasted Nuthatch 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 →

White-breasted Nuthatch has surged in New Hampshire: up 208% on the route-weighted index since 1968.

White-breasted Nuthatch Population Forecast in New Hampshire

If the recent trend holds, White-breasted Nuthatch in New Hampshire is projected to rise about 57% by 2030 — from 4.3 in 2025 to a central estimate of 6.7 (95% range 4.6–8.8). A 5-year backtest shows a typical error of ±29.7%, with 80% of held-out values landing inside the 95% band.

+57%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 →
6.7Projected 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 →
4.6–8.895% 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 →
±29.7%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, White-breasted Nuthatch in New Hampshire is projected to rise about 57% by 2030 — from 4.3 in 2025 to a central estimate of 6.7 (95% range 4.6–8.8). A 5-year backtest shows a typical error of ±29.7%, with 80% 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 →
20266.34.28.4
20276.44.38.5
20286.54.48.6
20296.64.58.7
20306.74.68.8

White-breasted Nuthatch Survey Routes in New Hampshire

Routes recording White-breasted Nuthatch 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 →
Canterbury1420251966
Dover1320251966
Hopkinton1120251967
East Kingston1020251999
Brentwood819981966
Walpole820251966
Concord720251966
Lempster520251971
Fitzwilliam420251967
Strafford420251966
Epsom320251966
Wilmot320251969
Mt Chocorua320251966
Marlow320251966
Franconia320241966
Milan320251987
Dixvil Notch320161992
Glen320251975
Peterborough220251966
Dixville Notch 2220242019
Gilmantn I W120251969
Crawford Not119751966
Jefferson Hl120251968
Stratford120211999
Clarksville120211975

White-breasted Nuthatch Population Trend in Other States

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

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