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

Willow Flycatcher Population Trend in Wisconsin

All statesAerial insectivores

Willow Flycatcher in Wisconsin has surged: up 114% on the route-weighted index since 1968.

+114%Since 1968
77Routes In State
58Years

Notable Willow Flycatcher Trends in Wisconsin

long arc increasecomputed index

Willow Flycatcher has surged in Wisconsin: up 114% on the route-weighted index since 1968.

Willow Flycatcher Population Forecast in Wisconsin

If the recent trend holds, Willow Flycatcher in Wisconsin is projected to rise about 22% by 2029 — from 1.3 in 2024 to a central estimate of 1.6 (95% range 1.1–2.1). A 5-year backtest shows a typical error of ±30.9%, with 80% of held-out values landing inside the 95% band.

+22%Change by 2029
1.6Projected 2029 index
1.1–2.195% range
±30.9%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
20251.51.12.0
20261.61.12.1
20271.61.12.1
20281.61.12.1
20291.61.12.1

Willow Flycatcher Survey Routes in Wisconsin

Routes recording Willow Flycatcher in Wisconsin.
Paris920241966
Gilmanton820241967
Hebron820241966
Viroqua720241966
Pardeeville620241985
Wiota620241966
Fall River520241989
Eden520241967
Highland520241998
Annaton520241998
Beloit520241998
Omro420011966
Kendall420231970
Hudson320241966
Dresser320231966
Stratford320211996
New Lisbon320241967
N Freedom320241966
Brownsville320211966
Buena Vista320232001
Grimms320211998
Briggsville320241999
Chaffey220161998
Cochrane220241966
Cadott220241980

Willow Flycatcher Population Trend in Other States

alaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

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