BirdAnalyst
Species · Pennsylvania · BBS 2026 Release · 1966–2025

House Finch Population Trend in Pennsylvania

All statesGeneralists

House Finch in Pennsylvania has surged: up 68× on the route-weighted index since 1973.

68×Since 1973TrendPercent 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 →
125Routes 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 →
54YearsYears 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 PennsylvaniaNotable 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 Pennsylvania: up 68× on the route-weighted index since 1973.

House Finch Population Forecast in Pennsylvania

If the recent trend holds, House Finch in Pennsylvania is projected to rise about 69% by 2030 — from 6.9 in 2025 to a central estimate of 12 (95% range 0.00–23). A 5-year backtest shows a typical error of ±79.9%, with 100% of held-out values landing inside the 95% band.

+69%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 →
12Projected 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 →
0.00–2395% 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 →
±79.9%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 Pennsylvania is projected to rise about 69% by 2030 — from 6.9 in 2025 to a central estimate of 12 (95% range 0.00–23). A 5-year backtest shows a typical error of ±79.9%, with 100% of held-out values landing inside the 95% band.19692030
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 →
2026110.0023
2027110.0023
2028110.0023
2029120.0023
2030120.0023

House Finch Survey Routes in Pennsylvania

Routes recording House Finch in Pennsylvania.
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 →
West Grove6119961977
Ryde5620051979
Gatchelville5419901977
Middletown4820251977
Akron4119971989
Quakertown3919891975
Millville3420251979
Aspers3419891980
Mt Gretna3220001988
Stoneybreak3220251992
Slippery Rk3019941984
Mt Gretna 23020222001
Pottstown2919871986
Jacobus2720251986
Labott2619831978
Mount Joy2620251988
Scheafferstn2520011992
Leola2420251998
Mifflintown2220251977
Schwenksvill2220241988
Schaefferstown 22120252002
Clearfield2020251980
Doe Run2020251977
Drehersville 21920252000
Portersville1719881988

House Finch Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonrhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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