BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Cassin's Vireo In Northern Rockies

All regionsNorthern RockiesForest birds

Cassin's Vireo in Northern Rockies has edged down: down 21% on the route-weighted index since 1970.

-21%Since 1970
95Routes In Region
56Years

Notable Signals

No notable trend signals for Cassin's Vireo in Northern Rockies. See the full index history below.

Forecast

If the recent trend holds, Cassin's Vireo in Northern Rockies is projected to rise about 10% by 2029 — from 1.6 in 2024 to a central estimate of 1.8 (95% range 0.94–2.6). A 5-year backtest shows a typical error of ±12.8%, with 100% of held-out values landing inside the 95% band.

+10%Change by 2029
1.8Projected 2029 index
0.94–2.695% range
±12.8%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
20251.70.902.5
20261.70.912.6
20271.70.922.6
20281.70.932.6
20291.80.942.6

Routes In Northern Rockies

Routes recording Cassin's Vireo in Northern Rockies.
Pagil GulchMONTANA212024
CusickWASHINGTON202024
CoolinIDAHO182024
Fish CreekMONTANA182024
Omak CreekWASHINGTON142024
FloraOREGON122023
NoxonMONTANA112023
Rochat DivdeIDAHO102023
Hells CanyonOREGON102022
Deer ParkWASHINGTON102015
NaplesIDAHO92024
NewbridgeOREGON92024
MonumentOREGON92024
Sullivan LkWASHINGTON91999
MivodenIDAHO82023
Skalkho-RyeMONTANA72022
Whitefish LakeMONTANA72024
Lolo PassIDAHO62019
Marble CreekIDAHO62022
St RegisMONTANA62024
WoodmanMONTANA62024
Greenoagh 3MONTANA62024
LaurierWASHINGTON62022
PierceIDAHO52007
Libby DamMONTANA52024

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