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

Chimney Swift In Piedmont

All regionsPiedmontAerial insectivores

Chimney Swift in Piedmont has fallen sharply: down 58% on the route-weighted index since 1968.

-58%Since 1968
171Routes In Region
58Years

Notable Signals

long arc declinecomputed index

Chimney Swift has fallen sharply in Piedmont: down 58% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Chimney Swift in Piedmont is projected to stay roughly flat through 2029, near 8.5 (95% range 5.2–12). A 5-year backtest shows a typical error of ±20%, with 100% of held-out values landing inside the 95% band.

+7%Change by 2029
8.5Projected 2029 index
5.2–1295% range
±20%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
20259.26.012
20269.05.812
20278.95.612
20288.75.412
20298.55.212

Routes In Piedmont

Routes recording Chimney Swift in Piedmont.
West GrovePENNSYLVANIA541996
WheatonMARYLAND432024
EphrataPENNSYLVANIA421988
AspersPENNSYLVANIA421989
MadisonNORTH-CAROLINA401985
MooresvilleNORTH-CAROLINA392001
CherryvilleNORTH-CAROLINA391968
OwingsSOUTH-CAROLINA362004
JoannaSOUTH-CAROLINA332019
EdenNORTH-CAROLINA322024
OstwaltNORTH-CAROLINA312024
PendletonSOUTH-CAROLINA311976
FairplayGEORGIA301991
HiramGEORGIA282018
Mount JoyPENNSYLVANIA282024
EkloMARYLAND272018
IjamsvilleMARYLAND272024
Little MtnSOUTH-CAROLINA271988
Silver SpgMARYLAND251989
Sporting HilPENNSYLVANIA241977
Hollonville 2GEORGIA232022
MonticelloNORTH-CAROLINA222024
Great FallsVIRGINIA211976
FlayNORTH-CAROLINA202024
Salem XrdSOUTH-CAROLINA202019

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