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Species · Idaho · BBS 2025 Release · 1966–2024

MacGillivray's Warbler Population Trend in Idaho

All statesForest birds

MacGillivray's Warbler in Idaho has surged: up 96% on the route-weighted index since 1973.

+96%Since 1973
47Routes In State
53Years

Notable MacGillivray's Warbler Trends in Idaho

long arc increasecomputed index

MacGillivray's Warbler has surged in Idaho: up 96% on the route-weighted index since 1973.

MacGillivray's Warbler Population Forecast in Idaho

If the recent trend holds, MacGillivray's Warbler in Idaho is projected to rise about 121% by 2029 — from 2.3 in 2024 to a central estimate of 5.0 (95% range 2.5–7.5). A 5-year backtest shows a typical error of ±88%, with 60% of held-out values landing inside the 95% band.

+121%Change by 2029
5.0Projected 2029 index
2.5–7.595% range
±88%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
20254.82.37.3
20264.92.47.4
20274.92.47.4
20285.02.57.5
20295.02.57.5

MacGillivray's Warbler Survey Routes in Idaho

Routes recording MacGillivray's Warbler in Idaho.
Golden4720161987
Pierce2720071990
Lolo Pass2520191992
Deep Creek2219851985
Mivoden1920231977
Magic Mtn1820241987
Centerville1620191972
N Fork Cda R1520191993
Baldy Mountain1520162013
Nezperce Nf1419991992
Cabarton1420231985
Nezperce1220121968
Cascade1019841982
Challis1020241975
Rochat Divde1020231993
Marble Creek1020231988
Avery920231979
Coolin920241986
Almo620221990
Naples520241972
Featherville520241989
Cobalt420241989
Sunbeam420191994
Burgdorf320161988
Yellow Pine320161989

MacGillivray's Warbler Population Trend in Other States

alaskaarizonacaliforniacoloradomontananevadanew-mexicooregonsouth-dakotatexasutahwashingtonwyoming

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