BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Bell's Vireo In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauForest birds

Bell's Vireo in Southern Rockies / Colorado Plateau has fallen sharply: down 75% on the route-weighted index since 1970.

-75%Since 1970
3Routes In Region
22Years

Notable Signals

long arc declinecomputed index

Bell's Vireo has fallen sharply in Southern Rockies / Colorado Plateau: down 75% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Bell's Vireo in Southern Rockies / Colorado Plateau is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±52.2%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.00Projected 2029 index
0.00–0.0595% range
±52.2%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
20250.010.000.06
20260.010.000.06
20270.010.000.06
20280.010.000.06
20290.000.000.05

Routes In Southern Rockies / Colorado Plateau

Routes recording Bell's Vireo in Southern Rockies / Colorado Plateau.
Peach SpringARIZONA32024
ShivwitzUTAH22016
The GapARIZONA11973

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