BirdAnalyst
Species · BCR 32 · BBS 2025 Release · 1966–2024

Bell's Vireo In Coastal California

All regionsCoastal CaliforniaForest birds

Bell's Vireo in Coastal California has surged: up 481% on the route-weighted index since 1976.

+481%Since 1976
13Routes In Region
18Years

Notable Signals

long arc increasecomputed index

Bell's Vireo has surged in Coastal California: up 481% on the route-weighted index since 1976.

Forecast

If the recent trend holds, Bell's Vireo in Coastal California is projected to fall about 71% by 2029 — from 0.34 in 2024 to a central estimate of 0.10 (95% range 0.00–0.24). A 5-year backtest shows a typical error of ±78.5%, with 40% of held-out values landing inside the 95% band.

-71%Change by 2029
0.10Projected 2029 index
0.00–0.2495% range
±78.5%Backtest error
19712029
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
20250.090.000.23
20260.090.000.23
20270.090.000.23
20280.100.000.24
20290.100.000.24

Routes In Coastal California

Routes recording Bell's Vireo in Coastal California.
Jofegan 2CALIFORNIA162024
San YsidroCALIFORNIA52019
Cp. PendletonCALIFORNIA22003
MorenoCALIFORNIA12012
Oak GroveCALIFORNIA12018
CoalingaCALIFORNIA11976
Orange CoveCALIFORNIA11997
PowayCALIFORNIA11979
Mesa GrandeCALIFORNIA12010
Cuyamaca PkCALIFORNIA11971
CrestonCALIFORNIA11976
AtwaterCALIFORNIA12012
JofeganCALIFORNIA12022

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