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

House Finch Population Trend in New Hampshire

All statesGeneralists

House Finch in New Hampshire has surged: up 681% on the route-weighted index since 1981.

+681%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 →
45YearsYears 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 681% 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 42% by 2029 — from 3.1 in 2024 to a central estimate of 1.8 (95% range 0.00–7.3). A 5-year backtest shows a typical error of ±41%, with 100% of held-out values landing inside the 95% band.

-42%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 →
1.8Projected 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 →
0.00–7.395% 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 →
±41%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 42% by 2029 — from 3.1 in 2024 to a central estimate of 1.8 (95% range 0.00–7.3). A 5-year backtest shows a typical error of ±41%, with 100% of held-out values landing inside the 95% band.19792029
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 →
20252.10.007.5
20262.00.007.5
20271.90.007.4
20281.90.007.3
20291.80.007.3

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 →
Dover3520241979
Brentwood1719981982
East Kingston1620241999
Epsom820231979
Mt Chocorua720021984
Concord320241983
Fitzwilliam220241982
Strafford220241982
Gilmantn I W220241985
Walpole220241987
Marlow220241984
Peterborough120241984
Hopkinton120241986
Canterbury120241991
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 2026-05-22.