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Species · Montana · BBS 2025 Release · 1966–2024

Varied Thrush Population Trend in Montana

All statesForest birds

Varied Thrush in Montana has edged up: up 12% on the route-weighted index since 1971.

+12%Since 1971
24Routes In State
55Years

Notable Varied Thrush Trends in Montana

No notable trend signals for Varied Thrush in Montana. See the full index history below.

Varied Thrush Population Forecast in Montana

If the recent trend holds, Varied Thrush in Montana is projected to rise about 68% by 2029 — from 0.40 in 2024 to a central estimate of 0.67 (95% range 0.00–1.7). A 5-year backtest shows a typical error of ±73.7%, with 100% of held-out values landing inside the 95% band.

+68%Change by 2029
0.67Projected 2029 index
0.00–1.795% range
±73.7%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
20250.680.001.7
20260.680.001.7
20270.680.001.7
20280.670.001.7
20290.670.001.7

Varied Thrush Survey Routes in Montana

Routes recording Varied Thrush in Montana.
Skalkaho1919981992
Logan Pass1720241980
Whitefish Lake1120242016
St Regis320231977
Skalkho-Rye320151999
St Mary219701970
Victor220111999
Greenough220021998
Sula220001991
Swan Lake220242017
Noxon220231995
Libby Dam119881979
Kalispell119901984
Threemile Wa120241994
Polson119891989
Arlee120241968
Woodman120231970
Clinton120241975
Inside Road120211990
East Glacier Park120242016
Thompson Riv120231993
Ninemile120181994
Fish Creek120211995
Painted Rock120161994

Varied Thrush Population Trend in Other States

alaskacaliforniaidahooregonwashington

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