BirdAnalyst
Species · Oregon · BBS 2025 Release · 1966–2024

Varied Thrush Population Trend in Oregon

All statesForest birds

Varied Thrush in Oregon has fallen sharply: down 62% on the route-weighted index since 1970.

-62%Since 1970
55Routes In State
56Years

Notable Varied Thrush Trends in Oregon

long arc declinecomputed index

Varied Thrush has fallen sharply in Oregon: down 62% on the route-weighted index since 1970.

Varied Thrush Population Forecast in Oregon

If the recent trend holds, Varied Thrush in Oregon is projected to rise about 209% by 2029 — from 0.72 in 2024 to a central estimate of 2.2 (95% range 0.60–3.8). A 5-year backtest shows a typical error of ±156.5%, with 60% of held-out values landing inside the 95% band.

+209%Change by 2029
2.2Projected 2029 index
0.60–3.895% range
±156.5%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
20252.20.543.8
20262.20.553.8
20272.20.573.8
20282.20.583.8
20292.20.603.8

Varied Thrush Survey Routes in Oregon

Routes recording Varied Thrush in Oregon.
Klickitat Mt2619961993
Cool Camp2220131968
Waldport2120011992
Santiam2020241994
Fisher2020101997
Riley Peak1920161994
Myrtle Grove1420231992
Trask Summit1220241992
Clearwater1120211993
Nicolai Mtn.1020241993
Svensen919921990
Harlan820092007
Cinderella820241993
Warner Mtn.620241992
Joseph519841982
Molalla420231994
Winberry420211968
Fisher 2420242017
Blue River420241992
Shellrock320231968
Wedderburn320212021
Scio320041972
Sandy River219991993
Scappoose220132013
Harlan 2220242011

Varied Thrush Population Trend in Other States

alaskacaliforniaidahomontanawashington

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