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

American Robin In Piedmont

All regionsPiedmontForest birds

American Robin in Piedmont has edged down: down 22% on the route-weighted index since 1968.

-22%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 →
171Routes 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 American Robin in Piedmont. See the full index history below.

American Robin In Piedmont Population Forecast

If the recent trend holds, American Robin in Piedmont is projected to stay roughly flat through 2029, near 31 (95% range 21–40). A 5-year backtest shows a typical error of ±19.3%, with 100% of held-out values landing inside the 95% band.

-3%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 →
31Projected 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 →
21–4095% 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 →
±19.3%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, American Robin in Piedmont is projected to stay roughly flat through 2029, near 31 (95% range 21–40). A 5-year backtest shows a typical error of ±19.3%, 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 →
2025322241
2026312241
2027312141
2028312141
2029312140

Routes In Piedmont

Routes recording American Robin 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 →
LeolaPENNSYLVANIA1972024
EmmitsburgMARYLAND1792024
WheatonMARYLAND1792024
West GrovePENNSYLVANIA1741996
CollegevillePENNSYLVANIA1712024
AkronPENNSYLVANIA1541997
AspersPENNSYLVANIA1531989
PottstownPENNSYLVANIA1371987
EarltonMARYLAND1332024
Mount JoyPENNSYLVANIA1222024
Croton 2NEW-JERSEY1082024
SchwenksvillPENNSYLVANIA1062024
MadonnaMARYLAND1012022
Bachman MillMARYLAND952024
OlneyMARYLAND892024
JacobusPENNSYLVANIA882024
Brick TavernPENNSYLVANIA872024
LabottPENNSYLVANIA851983
Pleasant ValMARYLAND782024
ChathamPENNSYLVANIA782024
GatchelvillePENNSYLVANIA761990
Mt Gretna 2PENNSYLVANIA762022
CrotonNEW-JERSEY742007
BendersvillePENNSYLVANIA742024
Upper XrdsMARYLAND732008

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