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Species · Montana · BBS 2025 Release · 1966–2024

MacGillivray's Warbler Population Trend in Montana

All statesForest birds

MacGillivray's Warbler in Montana has surged: up 101% on the route-weighted index since 1970.

+101%Since 1970
47Routes In State
56Years

Notable MacGillivray's Warbler Trends in Montana

long arc increasecomputed index

MacGillivray's Warbler has surged in Montana: up 100% on the route-weighted index since 1970.

MacGillivray's Warbler Population Forecast in Montana

If the recent trend holds, MacGillivray's Warbler in Montana is projected to rise about 80% by 2029 — from 2.1 in 2024 to a central estimate of 3.8 (95% range 2.1–5.5). A 5-year backtest shows a typical error of ±106.4%, with 0% of held-out values landing inside the 95% band.

+80%Change by 2029
3.8Projected 2029 index
2.1–5.595% range
±106.4%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
20253.71.95.4
20263.72.05.5
20273.72.05.5
20283.82.05.5
20293.82.15.5

MacGillivray's Warbler Survey Routes in Montana

Routes recording MacGillivray's Warbler in Montana.
Fish Creek2420241995
Skalkaho1919981992
Logan Pass1820241980
Whitefish Lake1520242016
Clinton1320241975
Noxon1220231995
Arlee1120241968
Greenoagh 21020112005
Libby Dam920241979
Woodman920241970
Painted Rock920221992
Sula820241978
Swan Lake820242015
Cramer Creek720191995
Inside Road720241990
Hebgen Lake720242017
St Regis620241977
Ninemile620241993
East Glacier Park520242015
Greenoagh 3520242012
Thompson Riv520241993
Lima420241994
Threemile Wa320241993
Elevation Mt320241995
Pryor Mtn.320241995

MacGillivray's Warbler Population Trend in Other States

alaskaarizonacaliforniacoloradoidahonevadanew-mexicooregonsouth-dakotatexasutahwashingtonwyoming

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