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

Brown-headed Cowbird In Piedmont

All regionsPiedmontGeneralists

Brown-headed Cowbird in Piedmont has held roughly steady: up 7% on the route-weighted index since 1968.

+7%Since 1968
170Routes In Region
58Years

Notable Signals

No notable trend signals for Brown-headed Cowbird in Piedmont. See the full index history below.

Forecast

If the recent trend holds, Brown-headed Cowbird in Piedmont is projected to stay roughly flat through 2029, near 8.3 (95% range 6.5–10). A 5-year backtest shows a typical error of ±8.1%, with 100% of held-out values landing inside the 95% band.

-3%Change by 2029
8.3Projected 2029 index
6.5–1095% range
±8.1%Backtest error
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 index95% low95% high
20258.26.49.9
20268.26.410.0
20278.26.510.0
20288.36.510
20298.36.510

Routes In Piedmont

Routes recording Brown-headed Cowbird in Piedmont.
OlneyMARYLAND442024
West GrovePENNSYLVANIA281996
JacobusPENNSYLVANIA282024
EarltonMARYLAND262024
MadonnaMARYLAND252022
CrotonNEW-JERSEY212007
EkloMARYLAND202018
MonticelloNORTH-CAROLINA202024
Mount JoyPENNSYLVANIA192024
CandlerGEORGIA172024
IjamsvilleMARYLAND172024
ChathamPENNSYLVANIA162024
Nixburg 2ALABAMA152024
Good HopeGEORGIA152024
Rock BranchGEORGIA152024
EmmitsburgMARYLAND152024
FlayNORTH-CAROLINA152024
Little MtnSOUTH-CAROLINA151988
MillervilleALABAMA142024
OstwaltNORTH-CAROLINA142024
BendersvillePENNSYLVANIA142024
RinggoldVIRGINIA142024
WylliesburgVIRGINIA142019
WheatonMARYLAND132024
Croton 2NEW-JERSEY132024

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