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

Song Sparrow Population Trend in New Hampshire

All statesGeneralists

Song Sparrow in New Hampshire has held roughly steady: up 2% on the route-weighted index since 1968.

+2%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 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 29% by 2029 — from 20 in 2024 to a central estimate of 14 (95% range 7.6–21). A 5-year backtest shows a typical error of ±34.1%, with 20% of held-out values landing inside the 95% band.

-29%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 →
14Projected 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 →
7.6–2195% 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 →
±34.1%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 29% by 2029 — from 20 in 2024 to a central estimate of 14 (95% range 7.6–21). A 5-year backtest shows a typical error of ±34.1%, with 20% 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 →
2025158.021
2026157.921
2027147.821
2028147.721
2029147.621

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 →
Concord3420241966
Walpole3320241966
Lempster3320241966
Dixville Notch 22720242018
Canterbury2620241966
Dixvil Notch2620171966
Clarksville2520241966
East Kingston2520241999
Milan2320241966
Fitzwilliam2220241966
Dover2220241966
Peterborough2120241966
Marlow2120241966
Glen1920241975
Jefferson Hl1720241966
Mt Chocorua1620241966
Wilmot1420241966
Stratford1420241966
Crawford Not1319751966
Franconia1220241966
Brentwood1119981966
Hopkinton1120241966
Epsom1020231966
Strafford820241966
Gilmantn I W820241969

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 2026-05-22.