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Species · Oregon · BBS 2025 Release · 1966–2024

Cassin's Vireo Population Trend in Oregon

All statesForest birds

Cassin's Vireo in Oregon has edged up: up 21% on the route-weighted index since 1970.

+21%Since 1970
95Routes In State
56Years

Notable Cassin's Vireo Trends in Oregon

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

Cassin's Vireo Population Forecast in Oregon

If the recent trend holds, Cassin's Vireo in Oregon is projected to rise about 20% by 2029 — from 1.6 in 2024 to a central estimate of 1.9 (95% range 1.3–2.6). A 5-year backtest shows a typical error of ±14.9%, with 80% of held-out values landing inside the 95% band.

+20%Change by 2029
1.9Projected 2029 index
1.3–2.695% range
±14.9%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
20251.91.22.6
20261.91.22.6
20271.91.22.6
20281.91.22.6
20291.91.32.6

Cassin's Vireo Survey Routes in Oregon

Routes recording Cassin's Vireo in Oregon.
Badger Creek2120241992
Ruch1420231992
Flora1220231986
Secret Val1120221975
Prospect1120241993
Davis Lake1020242000
Hells Canyon1020221992
Newbridge920241992
Monument920241993
Wizard Falls820241998
Selma820241993
Paunina720241993
Chinchalo620241993
Silver Creek520241984
Donnelly520061994
Wickiup420241969
Derby419931970
Eagle Rock419791971
Camp Sherman419961972
Granite420241993
Clearwater420211991
Glasgow419961988
Troy420241992
Bald Mtn.420241992
Timber320061971

Cassin's Vireo Population Trend in Other States

alaskacaliforniaidahomontanawashington

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