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

House Finch Population Trend in New Hampshire

All statesGeneralists

House Finch in New Hampshire has surged: up 881% on the route-weighted index since 1981.

+881%Since 1981TrendPercent 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 →
22Routes 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 →
46YearsYears 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 Finch 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 →

House Finch has surged in New Hampshire: up 881% on the route-weighted index since 1981.

House Finch Population Forecast in New Hampshire

If the recent trend holds, House Finch in New Hampshire is projected to fall about 52% by 2030 — from 4.0 in 2025 to a central estimate of 1.9 (95% range 0.00–7.4). A 5-year backtest shows a typical error of ±45.1%, with 100% of held-out values landing inside the 95% band.

-52%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 →
1.9Projected 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 →
0.00–7.495% 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 →
±45.1%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 Finch in New Hampshire is projected to fall about 52% by 2030 — from 4.0 in 2025 to a central estimate of 1.9 (95% range 0.00–7.4). A 5-year backtest shows a typical error of ±45.1%, with 100% of held-out values landing inside the 95% band.19792030
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 →
20262.20.007.6
20272.10.007.5
20282.10.007.5
20292.00.007.4
20301.90.007.4

House Finch Survey Routes in New Hampshire

Routes recording House Finch 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 →
Dover4520251979
Brentwood1719981982
East Kingston1620251999
Concord820251983
Mt Chocorua720021984
Peterborough520251984
Gilmantn I W520251985
Hopkinton320251986
Canterbury320251991
Walpole320251987
Marlow220251984
Fitzwilliam120251982
Epsom120251979
Strafford120251982
Wilmot120001979
Lempster120241980
Jefferson Hl120231985
Franconia120091986
Milan120211984
Stratford120011993
Dixvil Notch120141987
Glen120221984

House Finch Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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