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Species · Illinois · BBS 2025 Release · 1966–2024

Willow Flycatcher Population Trend in Illinois

All statesAerial insectivores

Willow Flycatcher in Illinois has held roughly steady: up 5% on the route-weighted index since 1968.

+5%Since 1968
99Routes In State
58Years

Notable Willow Flycatcher Trends in Illinois

No notable trend signals for Willow Flycatcher in Illinois. See the full index history below.

Willow Flycatcher Population Forecast in Illinois

If the recent trend holds, Willow Flycatcher in Illinois is projected to stay roughly flat through 2029, near 0.46 (95% range 0.11–0.81). A 5-year backtest shows a typical error of ±25.5%, with 80% of held-out values landing inside the 95% band.

+7%Change by 2029
0.46Projected 2029 index
0.11–0.8195% range
±25.5%Backtest error
19662029
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
20250.470.120.82
20260.470.120.81
20270.460.120.81
20280.460.110.81
20290.460.110.81

Willow Flycatcher Survey Routes in Illinois

Routes recording Willow Flycatcher in Illinois.
Clayton720232003
Belleview620231996
Alden520232019
Wayne420241967
Stillwell420231982
Robinson420231970
Darmstadt420232014
Putnam320241967
Flora320021996
Camp Point320231995
Mill Creek220231966
Cherry Val220031972
Buda220231989
Essex220162009
Gulfport220232001
Chandlervill220241973
Bartonville220241975
Deer Creek220241968
Mackinaw219871974
Fairbury220221999
Dailey220001986
Milford220121974
Bluff Spgs220231967
Athensville220241974
Concord220231967

Willow Flycatcher Population Trend in Other States

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

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