BirdAnalyst
Species · BCR 34 · BBS 2025 Release · 1966–2024

Gray Vireo In Sierra Madre Occidental

All regionsSierra Madre OccidentalForest birds

Gray Vireo in Sierra Madre Occidental has edged down: down 11% on the route-weighted index since 1975.

-11%Since 1975
16Routes In Region
43Years

Notable Signals

No notable trend signals for Gray Vireo in Sierra Madre Occidental. See the full index history below.

Forecast

If the recent trend holds, Gray Vireo in Sierra Madre Occidental is projected to fall about 28% by 2029 — from 1.0 in 2024 to a central estimate of 0.72 (95% range 0.05–1.4). A 5-year backtest shows a typical error of ±99.3%, with 100% of held-out values landing inside the 95% band.

-28%Change by 2029
0.72Projected 2029 index
0.05–1.495% range
±99.3%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
20250.710.031.4
20260.710.041.4
20270.710.041.4
20280.720.051.4
20290.720.051.4

Routes In Sierra Madre Occidental

Routes recording Gray Vireo in Sierra Madre Occidental.
Carr MtnARIZONA82024
MagdalenaNEW-MEXICO52024
Mormon LakeARIZONA41968
Forest LakesARIZONA42024
Aztec PeakARIZONA31978
CutterARIZONA31996
RedingtonARIZONA32022
Tonto Vill.ARIZONA22021
BlueARIZONA11984
MaineARIZONA11997
Skull ValleyARIZONA12024
Bartlett ResARIZONA12019
Clay SpringARIZONA12010
ReserveNEW-MEXICO12022
Vicks PeakNEW-MEXICO12022
Emory PassNEW-MEXICO12012

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