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

Chipping Sparrow Population Trend in New Hampshire

All statesGeneralists

Chipping Sparrow in New Hampshire has surged: up 88% on the route-weighted index since 1968.

+88%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 →
58YearsYears 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 surged in New Hampshire: up 88% 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 33% by 2029 — from 20 in 2024 to a central estimate of 26 (95% range 22–31). A 5-year backtest shows a typical error of ±14.5%, with 60% of held-out values landing inside the 95% band.

+33%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 →
26Projected 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 →
22–3195% 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 →
±14.5%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 33% by 2029 — from 20 in 2024 to a central estimate of 26 (95% range 22–31). A 5-year backtest shows a typical error of ±14.5%, with 60% of held-out values landing inside the 95% band.19662029
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 →
2025252130
2026252130
2027262130
2028262230
2029262231

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 →
Dover4320241966
Glen4020241975
Concord3620241966
Canterbury3120241966
Walpole2920241966
Epsom2620231966
Lempster2520241966
Brentwood2319981966
Fitzwilliam2320241966
Strafford2120241966
Franconia2120241966
Mt Chocorua2020241966
East Kingston2020241999
Peterborough1820241966
Jefferson Hl1820241966
Gilmantn I W1720241969
Wilmot1620241966
Dixvil Notch1520171966
Hopkinton1120241966
Dixville Notch 21020242018
Stratford920241966
Clarksville920241966
Milan720241966
Marlow620241966
Jeffers Ntch420241994

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 2026-05-22.