BirdAnalyst
Species · BCR 29 · BBS 2025 Release · 1966–2024

House Sparrow In Piedmont

All regionsPiedmontGeneralists

House Sparrow in Piedmont has collapsed: down 82% on the route-weighted index since 1968.

-82%Since 1968TrendPercent 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 →
159Routes 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 →
58YearsYears 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 declinecomputed 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 Sparrow has collapsed in Piedmont: down 82% on the route-weighted index since 1968.

House Sparrow In Piedmont Population Forecast

If the recent trend holds, House Sparrow in Piedmont is projected to fall about 100% by 2029 — from 15 in 2024 to a central estimate of 0.00 (95% range 0.00–16). A 5-year backtest shows a typical error of ±131.7%, with 40% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–1695% 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 →
±131.7%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 Sparrow in Piedmont is projected to fall about 100% by 2029 — from 15 in 2024 to a central estimate of 0.00 (95% range 0.00–16). A 5-year backtest shows a typical error of ±131.7%, with 40% of held-out values landing inside the 95% band.19662029
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 →
20250.000.0016
20260.000.0016
20270.000.0016
20280.000.0016
20290.000.0016

Routes In Piedmont

Routes recording House Sparrow 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 →
PassaicNEW-JERSEY2841969
LeolaPENNSYLVANIA2392024
AkronPENNSYLVANIA2051997
Sporting HilPENNSYLVANIA1761977
Mount JoyPENNSYLVANIA1732024
CherryvilleNORTH-CAROLINA1451968
WheatonMARYLAND1342024
EphrataPENNSYLVANIA1281988
MadonnaMARYLAND1252022
Mt GretnaPENNSYLVANIA1232000
LabottPENNSYLVANIA1111983
AspersPENNSYLVANIA981989
Great FallsVIRGINIA841978
EmmitsburgMARYLAND812024
Silver SpgMARYLAND811989
GatchelvillePENNSYLVANIA691990
Upper XrdsMARYLAND602008
CollegevillePENNSYLVANIA592024
EarltonMARYLAND582024
Pleasant ValMARYLAND532024
EkloMARYLAND512018
NorwoodMARYLAND472012
IjamsvilleMARYLAND442024
PendletonSOUTH-CAROLINA431976
MadisonNORTH-CAROLINA381985

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.