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.

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.