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

Western Tanager Population Trend in Montana

All statesGeneralists

Western Tanager in Montana has surged: up 235% on the route-weighted index since 1970.

+235%Since 1970
69Routes In State
56Years

Notable Western Tanager Trends in Montana

long arc increasecomputed index

Western Tanager has surged in Montana: up 235% on the route-weighted index since 1970.

Western Tanager Population Forecast in Montana

If the recent trend holds, Western Tanager in Montana is projected to stay roughly flat through 2029, near 6.2 (95% range 4.4–7.9). A 5-year backtest shows a typical error of ±7.2%, with 100% of held-out values landing inside the 95% band.

+6%Change by 2029
6.2Projected 2029 index
4.4–7.995% range
±7.2%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
20255.94.17.7
20266.04.27.7
20276.04.37.8
20286.14.37.9
20296.24.47.9

Western Tanager Survey Routes in Montana

Routes recording Western Tanager in Montana.
Threemile Wa4220241993
Greenoagh 33820242012
Woodman3120241968
Cramer Creek3020191994
Elevation Mt2920241995
Whitefish Lake2920242016
Painted Rock2720221992
St Regis2520241977
Swan Lake2520242015
Greenoagh 22520112005
Skalkaho2519981992
Red Rock2420241981
Thompson Riv2420241993
Hebgen Lake2420242017
Skalkho-Rye2220221999
Fish Creek2220241995
Libby Dam2020241979
Clinton1920241972
Maynard Coulee1720242017
Noxon1520231995
Arlee1420241968
Sula1420241977
Pryor Mtn.1320241995
East Glacier Park1120242015
Victor1020241993

Western Tanager Population Trend in Other States

alaskaarizonacaliforniacoloradoidahonebraskanevadanew-mexicooregonsouth-dakotatexasutahwashingtonwyoming

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