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

Song Sparrow In Piedmont

All regionsPiedmontGeneralists

Song Sparrow in Piedmont has held roughly steady: down 9% on the route-weighted index since 1968.

-9%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 →
140Routes 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 →

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 fall about 17% by 2029 — from 9.8 in 2024 to a central estimate of 8.1 (95% range 5.2–11). A 5-year backtest shows a typical error of ±6.6%, with 100% of held-out values landing inside the 95% band.

-17%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 →
8.1Projected 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 →
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 →
±6.6%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 fall about 17% by 2029 — from 9.8 in 2024 to a central estimate of 8.1 (95% range 5.2–11). A 5-year backtest shows a typical error of ±6.6%, with 100% 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 →
20258.45.611
20268.35.511
20278.25.411
20288.25.311
20298.15.211

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
EmmitsburgMARYLAND642024
Doe RunPENNSYLVANIA612024
MadonnaMARYLAND562022
EarltonMARYLAND532024
CrotonNEW-JERSEY532007
Croton 2NEW-JERSEY532024
ChathamPENNSYLVANIA502024
CollegevillePENNSYLVANIA472024
EkloMARYLAND462018
LeolaPENNSYLVANIA442024
WheatonMARYLAND392024
OlneyMARYLAND382024
Mount JoyPENNSYLVANIA382024
JacobusPENNSYLVANIA382024
PottstownPENNSYLVANIA371987
Silver SpgMARYLAND351989
CherryvilleNORTH-CAROLINA351968
SchwenksvillPENNSYLVANIA352024
AkronPENNSYLVANIA331997
IjamsvilleMARYLAND322024
Great FallsVIRGINIA311978
SandbrookNEW-JERSEY302024
LabottPENNSYLVANIA301983
Pleasant ValMARYLAND282024

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