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

Willow Flycatcher Population Trend in Idaho

All statesAerial insectivores

Willow Flycatcher in Idaho has surged: up 112% on the route-weighted index since 1971.

+112%Since 1971
53Routes In State
55Years

Notable Willow Flycatcher Trends in Idaho

long arc increasecomputed index

Willow Flycatcher has surged in Idaho: up 112% on the route-weighted index since 1971.

Willow Flycatcher Population Forecast in Idaho

If the recent trend holds, Willow Flycatcher in Idaho is projected to stay roughly flat through 2029, near 2.2 (95% range 0.39–4.0). A 5-year backtest shows a typical error of ±26.8%, with 100% of held-out values landing inside the 95% band.

-1%Change by 2029
2.2Projected 2029 index
0.39–4.095% range
±26.8%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
20252.20.404.0
20262.20.404.0
20272.20.404.0
20282.20.394.0
20292.20.394.0

Willow Flycatcher Survey Routes in Idaho

Routes recording Willow Flycatcher in Idaho.
Cabarton2420231985
Naples1620241973
Pierce1520071990
Joel1220241989
Cascade1119841971
Cape Horn820241987
Marble Creek820231988
Rochat Divde820231993
Nezperce Nf719991992
Gifford620171971
Grangeville519861986
Golden520161987
Challis520241975
N Fork Cda R520191994
Alturas519861968
Mivoden420231977
Burgdorf420161988
Nezperce320121992
Lolo Pass320191997
Baker320241974
Sawtooth City 2320232015
Cobalt320241991
Deep Creek219851985
Leadore220241974
Dubois220241974

Willow Flycatcher Population Trend in Other States

alaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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