BirdAnalyst
Species · BCR 29 · BBS 2026 Release · 1966–2025

House Finch In Piedmont

All regionsPiedmontGeneralists

House Finch in Piedmont has surged: up 75× on the route-weighted index since 1977.

75×Since 1977TrendPercent 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 →
162Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
50YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Piedmont: up 75× on the route-weighted index since 1977.

House Finch In Piedmont Population Forecast

If the recent trend holds, House Finch in Piedmont is projected to rise about 21% by 2030 — from 12 in 2025 to a central estimate of 15 (95% range 4.9–25). A 5-year backtest shows a typical error of ±38.5%, 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 →
15Projected 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 →
4.9–2595% 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 →
±38.5%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 Piedmont is projected to rise about 21% by 2030 — from 12 in 2025 to a central estimate of 15 (95% range 4.9–25). A 5-year backtest shows a typical error of ±38.5%, 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 →
2026144.324
2027144.524
2028144.624
2029154.824
2030154.925

Routes In Piedmont

Routes recording House Finch in Piedmont.
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 GrovePENNSYLVANIA611996
GatchelvillePENNSYLVANIA541990
Silver SpgMARYLAND531989
EkloMARYLAND432018
AkronPENNSYLVANIA411997
IjamsvilleMARYLAND402025
EarltonMARYLAND402024
WheatonMARYLAND382025
Barton CreekSOUTH-CAROLINA372022
MadonnaMARYLAND342022
AspersPENNSYLVANIA341989
Pleasant ValMARYLAND322025
Mt GretnaPENNSYLVANIA322000
StockbridgeGEORGIA312025
CandlerGEORGIA312025
WarfieldsbrgMARYLAND312025
ClimaxNORTH-CAROLINA302025
Mt Gretna 2PENNSYLVANIA302022
PottstownPENNSYLVANIA291987
OlneyMARYLAND282025
SheffieldNORTH-CAROLINA282025
AthensGEORGIA272025
JacobusPENNSYLVANIA272025
Owings 2SOUTH-CAROLINA272025
HiramGEORGIA262018

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