BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Warbling Vireo In Sierra Nevada

All regionsSierra NevadaForest birds

Warbling Vireo in Sierra Nevada has surged: up 97% on the route-weighted index since 1971.

+97%Since 1971
40Routes In Region
55Years

Notable Signals

long arc increasecomputed index

Warbling Vireo has surged in Sierra Nevada: up 97% on the route-weighted index since 1971.

Forecast

If the recent trend holds, Warbling Vireo in Sierra Nevada is projected to rise about 20% by 2029 — from 8.6 in 2024 to a central estimate of 10 (95% range 6.8–14). A 5-year backtest shows a typical error of ±21.3%, with 100% of held-out values landing inside the 95% band.

+20%Change by 2029
10Projected 2029 index
6.8–1495% range
±21.3%Backtest error
19682029
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
202510.06.514
2026106.614
2027106.614
2028106.714
2029106.814

Routes In Sierra Nevada

Routes recording Warbling Vireo in Sierra Nevada.
Little TruckeeCALIFORNIA252023
GeneseeCALIFORNIA242024
WoodfordsCALIFORNIA202024
RivertonCALIFORNIA172023
Meadow ValleyCALIFORNIA152024
Tuolumne GroveCALIFORNIA142024
JohnsvilleCALIFORNIA132024
Cottage SpgsCALIFORNIA111968
DardanelleCALIFORNIA112019
LumberyardCALIFORNIA112024
WestvilleCALIFORNIA102024
Butte MeadowCALIFORNIA102014
StrawberryCALIFORNIA102019
Higgins CornCALIFORNIA92021
Pollock PinesCALIFORNIA92024
Kings CanyonCALIFORNIA82024
Tahoe NfCALIFORNIA81994
PlacervilleCALIFORNIA82024
Eagle LakeCALIFORNIA72024
LakeshoreCALIFORNIA72024
GoumazCALIFORNIA62011
DownievilleCALIFORNIA52024
Chaos CraterCALIFORNIA52019
PaxtonCALIFORNIA42024
Pine MountainCALIFORNIA42017

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