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

Common Grackle In Piedmont

All regionsPiedmontGeneralists

Common Grackle in Piedmont has collapsed: down 86% on the route-weighted index since 1968.

-86%Since 1968
172Routes In Region
58Years

Notable Signals

long arc declinecomputed index

Common Grackle has collapsed in Piedmont: down 86% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Common Grackle in Piedmont is projected to fall about 100% by 2029 — from 16 in 2024 to a central estimate of 0.00 (95% range 0.00–24). A 5-year backtest shows a typical error of ±83.4%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–2495% range
±83.4%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
20251.00.0025
20260.000.0024
20270.000.0024
20280.000.0024
20290.000.0024

Routes In Piedmont

Routes recording Common Grackle in Piedmont.
AkronPENNSYLVANIA4041997
Sporting HilPENNSYLVANIA2291977
AspersPENNSYLVANIA1911989
PottstownPENNSYLVANIA1831987
Mt GretnaPENNSYLVANIA1582000
LabottPENNSYLVANIA1501983
LeolaPENNSYLVANIA1412024
Rock BranchGEORGIA1342024
GatchelvillePENNSYLVANIA1321990
EphrataPENNSYLVANIA1211988
PendletonSOUTH-CAROLINA1211976
West GrovePENNSYLVANIA1001996
Mt Gretna 2PENNSYLVANIA872022
Mount JoyPENNSYLVANIA812024
PassaicNEW-JERSEY801969
CherryvilleNORTH-CAROLINA771968
EmmitsburgMARYLAND752024
Bald FriarMARYLAND751996
MetasvilleGEORGIA702000
DavidVIRGINIA692013
Boiling SpgsSOUTH-CAROLINA661979
Brandy StationVIRGINIA642024
WilgroveNORTH-CAROLINA552023
AppomattoxVIRGINIA512024
MadisonNORTH-CAROLINA491985

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