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

Chipping Sparrow Population Trend in New Hampshire

All statesForest birds

Chipping Sparrow in New Hampshire has risen sharply: up 71% on the route-weighted index since 1968.

+71%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 Chipping Sparrow 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 →

Chipping Sparrow has risen sharply in New Hampshire: up 71% on the route-weighted index since 1968.

Chipping Sparrow Population Forecast in New Hampshire

If the recent trend holds, Chipping Sparrow in New Hampshire is projected to rise about 38% by 2030 — from 19 in 2025 to a central estimate of 26 (95% range 21–31). A 5-year backtest shows a typical error of ±18.5%, with 40% of held-out values landing inside the 95% band.

+38%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 →
26Projected 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 →
21–3195% 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 →
±18.5%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, Chipping Sparrow in New Hampshire is projected to rise about 38% by 2030 — from 19 in 2025 to a central estimate of 26 (95% range 21–31). A 5-year backtest shows a typical error of ±18.5%, with 40% 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 →
2026252030
2027252130
2028262130
2029262130
2030262131

Chipping Sparrow Survey Routes in New Hampshire

Routes recording Chipping Sparrow 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 →
Dover4220251966
Concord3220251966
Fitzwilliam3020251966
Walpole3020251966
Canterbury2820251966
Wilmot2820251966
Glen2620251975
East Kingston2620251999
Epsom2420251966
Brentwood2319981966
Marlow1920251966
Strafford1820251966
Peterborough1620251966
Gilmantn I W1520251969
Lempster1520251966
Jefferson Hl1520251966
Dixvil Notch1520171966
Mt Chocorua1420251966
Franconia1420251966
Clarksville1320251966
Milan920251966
Stratford820251966
Dixville Notch 2620252018
Hopkinton420251966
Jeffers Ntch220251994

Chipping Sparrow 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.