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

Song Sparrow Population Trend in New Hampshire

All statesForest birds

Song Sparrow in New Hampshire has held roughly steady: up 1% on the route-weighted index since 1968.

+1%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 Song 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 →

No notable trend signals for Song Sparrow in New Hampshire. See the full index history below.

Song Sparrow Population Forecast in New Hampshire

If the recent trend holds, Song Sparrow in New Hampshire is projected to fall about 27% by 2030 — from 20 in 2025 to a central estimate of 15 (95% range 7.8–21). A 5-year backtest shows a typical error of ±34.2%, with 20% of held-out values landing inside the 95% band.

-27%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 →
15Projected 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 →
7.8–2195% 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 →
±34.2%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, Song Sparrow in New Hampshire is projected to fall about 27% by 2030 — from 20 in 2025 to a central estimate of 15 (95% range 7.8–21). A 5-year backtest shows a typical error of ±34.2%, with 20% 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 →
2026158.222
2027158.121
2028158.021
2029157.921
2030157.821

Song Sparrow Survey Routes in New Hampshire

Routes recording Song 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 →
Walpole3920251966
Concord3420251966
Lempster3420251966
Stratford3420251966
Fitzwilliam3120251966
Canterbury2720251966
Milan2720251966
Dixville Notch 22720252018
Dixvil Notch2620171966
East Kingston2520251999
Marlow2320251966
Glen1920251975
Dover1720251966
Wilmot1720251966
Clarksville1620251966
Jefferson Hl1420251966
Crawford Not1319751966
Brentwood1119981966
Hopkinton1120251966
Gilmantn I W1120251969
Peterborough1020251966
Strafford1020251966
Epsom920251966
Mt Chocorua920251966
Jeffers Ntch920251993

Song Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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