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

Rose-breasted Grosbeak In Piedmont

All regionsPiedmontGeneralists

Rose-breasted Grosbeak in Piedmont has declined: down 25% on the route-weighted index since 1971.

-25%Since 1971TrendPercent 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 →
29Routes 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 →
48YearsYears 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 Rose-breasted Grosbeak in Piedmont. See the full index history below.

Rose-breasted Grosbeak In Piedmont Population Forecast

If the recent trend holds, Rose-breasted Grosbeak in Piedmont is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.07). A 5-year backtest shows a typical error of ±60.9%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.01Projected 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 →
0.00–0.0795% 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 →
±60.9%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, Rose-breasted Grosbeak in Piedmont is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.07). A 5-year backtest shows a typical error of ±60.9%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20250.020.000.08
20260.020.000.08
20270.010.000.08
20280.010.000.08
20290.010.000.07

Routes In Piedmont

Routes recording Rose-breasted Grosbeak 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 →
Mount JoyPENNSYLVANIA52006
IjamsvilleMARYLAND22014
SandbrookNEW-JERSEY22024
PottersvilleNEW-JERSEY22022
GilletteNEW-JERSEY22024
AmherstVIRGINIA22000
ShipmanVIRGINIA21972
HollonvilleGEORGIA11977
OlneyMARYLAND12016
Bachman MillMARYLAND12007
EkloMARYLAND11987
Upper XrdsMARYLAND11973
Van BibberMARYLAND11998
Bald FriarMARYLAND11995
CrotonNEW-JERSEY12007
Croton 2NEW-JERSEY12022
ClimaxNORTH-CAROLINA11985
CopelandNORTH-CAROLINA11974
CallNORTH-CAROLINA11992
CollegevillePENNSYLVANIA12023
LabottPENNSYLVANIA11969
Doe RunPENNSYLVANIA11973
Brick TavernPENNSYLVANIA11999
SchwenksvillPENNSYLVANIA12011
TaylorstownVIRGINIA11982

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