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

Warbling Vireo In Piedmont

All regionsPiedmontForest birds

Warbling Vireo in Piedmont has surged: up 198% on the route-weighted index since 1968.

+198%Since 1968
56Routes In Region
58Years

Notable Signals

long arc increasecomputed index

Warbling Vireo has surged in Piedmont: up 198% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Warbling Vireo in Piedmont is projected to fall about 24% by 2029 — from 0.59 in 2024 to a central estimate of 0.45 (95% range 0.25–0.64). A 5-year backtest shows a typical error of ±24.9%, with 100% of held-out values landing inside the 95% band.

-24%Change by 2029
0.45Projected 2029 index
0.25–0.6495% range
±24.9%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
20250.430.240.63
20260.440.240.63
20270.440.240.64
20280.440.250.64
20290.450.250.64

Routes In Piedmont

Routes recording Warbling Vireo in Piedmont.
EarltonMARYLAND162024
West GrovePENNSYLVANIA111996
EmmitsburgMARYLAND62024
Mount JoyPENNSYLVANIA52024
ChathamPENNSYLVANIA42024
MadonnaMARYLAND32022
JacobusPENNSYLVANIA32024
TaylorstownVIRGINIA32007
Taylorstown 2VIRGINIA32024
OlneyMARYLAND22024
Bachman MillMARYLAND22024
RandallstownMARYLAND22013
Upper XrdsMARYLAND22006
Van BibberMARYLAND22011
IjamsvilleMARYLAND22024
CollegevillePENNSYLVANIA22024
AspersPENNSYLVANIA21973
BendersvillePENNSYLVANIA22024
Silver SpgMARYLAND11979
NorwoodMARYLAND11978
WarfieldsbrgMARYLAND12023
Pleasant ValMARYLAND12024
FowblesburgMARYLAND12016
EkloMARYLAND12014
TheodoreMARYLAND12016

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