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

Song Sparrow In Piedmont

All regionsPiedmontForest birds

Song Sparrow in Piedmont has held roughly steady: down 10% on the route-weighted index since 1968.

-10%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 →
142Routes 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 →
59YearsYears 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 →

No notable trend signals for Song Sparrow in Piedmont. See the full index history below.

Song Sparrow In Piedmont Population Forecast

If the recent trend holds, Song Sparrow in Piedmont is projected to stay roughly flat through 2030, near 8.0 (95% range 5.2–11). A 5-year backtest shows a typical error of ±7.1%, with 100% of held-out values landing inside the 95% band.

-1%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 →
8.0Projected 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 →
5.2–1195% 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 →
±7.1%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, Song Sparrow in Piedmont is projected to stay roughly flat through 2030, near 8.0 (95% range 5.2–11). A 5-year backtest shows a typical error of ±7.1%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20268.35.511
20278.25.411
20288.15.311
20298.15.211
20308.05.211

Routes In Piedmont

Routes recording Song 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 →
West GrovePENNSYLVANIA691996
EmmitsburgMARYLAND642025
MadonnaMARYLAND562022
EarltonMARYLAND532024
CrotonNEW-JERSEY532007
OlneyMARYLAND492025
Croton 2NEW-JERSEY492025
CollegevillePENNSYLVANIA472024
EkloMARYLAND462018
Doe RunPENNSYLVANIA452025
WheatonMARYLAND422025
IjamsvilleMARYLAND422025
Mount JoyPENNSYLVANIA402025
ChathamPENNSYLVANIA402025
PottstownPENNSYLVANIA371987
LeolaPENNSYLVANIA372025
WarfieldsbrgMARYLAND362025
Silver SpgMARYLAND351989
CherryvilleNORTH-CAROLINA351968
SchwenksvillPENNSYLVANIA352024
AkronPENNSYLVANIA331997
JacobusPENNSYLVANIA312025
Great FallsVIRGINIA311978
LabottPENNSYLVANIA301983
Bachman MillMARYLAND272025

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