BirdAnalyst
Species · South Carolina · BBS 2026 Release · 1966–2025

House Finch Population Trend in South Carolina

All statesGeneralists

House Finch in South Carolina has surged: up 12× on the route-weighted index since 1991.

12×Since 1991TrendPercent 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 →
41Routes 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 →
36YearsYears 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 South CarolinaNotable 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 South Carolina: up 12× on the route-weighted index since 1991.

House Finch Population Forecast in South Carolina

If the recent trend holds, House Finch in South Carolina is projected to fall about 21% by 2030 — from 6.4 in 2025 to a central estimate of 5.1 (95% range 2.4–7.8). A 5-year backtest shows a typical error of ±23.1%, with 100% of held-out values landing inside the 95% band.

-21%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 →
5.1Projected 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 →
2.4–7.895% 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 →
±23.1%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 South Carolina is projected to fall about 21% by 2030 — from 6.4 in 2025 to a central estimate of 5.1 (95% range 2.4–7.8). A 5-year backtest shows a typical error of ±23.1%, with 100% of held-out values landing inside the 95% band.19862030
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 →
20264.92.27.6
20274.92.27.6
20285.02.37.7
20295.02.37.7
20305.12.47.8

House Finch Survey Routes in South Carolina

Routes recording House Finch in South Carolina.
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 →
Barton Creek3720221991
Owings 22720252005
Ward2420252018
Campobello1820252010
Prosperity1820241994
Chesnee1820151992
New Ellenton1620252010
Rome1420252005
Owings1220041995
Bishopville1020251994
Kiawah Island1020252002
Adams Run1020242004
Coward920251995
Landrum819921992
New Holland720251991
Pinewood720191999
Olar620132004
Foreston520252001
Plum Branch520251994
Blacksburg520131998
Red Bluff520252017
Holly Hill420252000
Wagener420251994
Salem420252010
Lowrys320252017

House Finch Population Trend in Other States

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

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