BirdAnalyst
Species · BCR 29 · BBS 2026 Release · 1966–2025

Blue-headed Vireo In Piedmont

All regionsPiedmontForest birds

Blue-headed Vireo in Piedmont has surged: up 92% on the route-weighted index since 1976.

+92%Since 1976TrendPercent 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 →
67Routes 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 Blue-headed Vireo in Piedmont. See the full index history below.

Blue-headed Vireo In Piedmont Population Forecast

If the recent trend holds, Blue-headed Vireo in Piedmont is projected to stay roughly flat through 2030, near 0.20 (95% range 0.02–0.38). A 5-year backtest shows a typical error of ±211.4%, with 60% of held-out values landing inside the 95% band.

n/aChange by 2030TrendPercent 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 →
0.20Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.02–0.3895% 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 →
±211.4%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, Blue-headed Vireo in Piedmont is projected to stay roughly flat through 2030, near 0.20 (95% range 0.02–0.38). A 5-year backtest shows a typical error of ±211.4%, with 60% of held-out values landing inside the 95% band.19672030
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 →
20260.190.010.37
20270.200.010.38
20280.200.020.38
20290.200.020.38
20300.200.020.38

Routes In Piedmont

Routes recording Blue-headed Vireo 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 →
TrymeVIRGINIA112006
DurhamNORTH-CAROLINA72021
Ball GroundGEORGIA52021
Piedmont NwrGEORGIA42003
WhitmireSOUTH-CAROLINA42024
GrovetownGEORGIA31981
JulietteGEORGIA32016
AshlandNORTH-CAROLINA32021
SharonGEORGIA22022
OakboroNORTH-CAROLINA21978
MadisonNORTH-CAROLINA21977
WacoNORTH-CAROLINA22018
GuptonNORTH-CAROLINA22016
Salem XrdSOUTH-CAROLINA22007
Plum BranchSOUTH-CAROLINA22025
CampobelloSOUTH-CAROLINA22011
BlacksburgSOUTH-CAROLINA21999
WedoweeALABAMA12008
ForsythGEORGIA11994
CrestGEORGIA12018
LincolntonGEORGIA12008
MaxeysGEORGIA12017
BaldwinGEORGIA12007
SiloamGEORGIA11967
BowdonGEORGIA12016

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.