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

House Sparrow Population Trend in New Hampshire

All statesGeneralists

House Sparrow in New Hampshire has declined: down 39% on the route-weighted index since 1968.

-39%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 →
23Routes 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 House 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 House Sparrow in New Hampshire. See the full index history below.

House Sparrow Population Forecast in New Hampshire

If the recent trend holds, House Sparrow in New Hampshire is projected to fall about 32% by 2029 — from 5.5 in 2024 to a central estimate of 3.7 (95% range 0.88–6.6). A 5-year backtest shows a typical error of ±29.1%, with 100% of held-out values landing inside the 95% band.

-32%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 →
3.7Projected 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 →
0.88–6.695% 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 →
±29.1%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, House Sparrow in New Hampshire is projected to fall about 32% by 2029 — from 5.5 in 2024 to a central estimate of 3.7 (95% range 0.88–6.6). A 5-year backtest shows a typical error of ±29.1%, with 100% 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 →
20254.01.26.9
20264.01.16.8
20273.91.06.7
20283.80.966.6
20293.70.886.6

House Sparrow Survey Routes in New Hampshire

Routes recording House 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 →
Dover2420241966
Epsom2020231966
Brentwood1919981966
East Kingston1820241999
Fitzwilliam1720241966
Glen1620241975
Concord1520241966
Marlow1020241966
Peterborough820241967
Canterbury620241966
Strafford420241966
Mt Chocorua320231966
Stratford319981966
Hopkinton220241966
Wilmot220221968
Dixvil Notch219961967
Gilmantn I W120241970
Walpole120231966
Lempster120091966
Jefferson Hl120231972
Franconia120211967
Milan120221966
Clarksville119991966

House 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.