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

Willow Flycatcher Population Trend in Maine

All statesAerial insectivores

Willow Flycatcher in Maine has collapsed: down 80% on the route-weighted index since 1979.

-80%Since 1979
30Routes In State
42Years

Notable Willow Flycatcher Trends in Maine

long arc declinecomputed index

Willow Flycatcher has collapsed in Maine: down 80% on the route-weighted index since 1979.

Willow Flycatcher Population Forecast in Maine

If the recent trend holds, Willow Flycatcher in Maine is projected to fall about 87% by 2027 — from 0.10 in 2022 to a central estimate of 0.01 (95% range 0.00–0.30). A 5-year backtest shows a typical error of ±95.8%, with 100% of held-out values landing inside the 95% band.

-87%Change by 2027
0.01Projected 2027 index
0.00–0.3095% range
±95.8%Backtest error
19702027
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
20230.030.000.31
20240.020.000.31
20250.020.000.30
20260.020.000.30
20270.010.000.30

Willow Flycatcher Survey Routes in Maine

Routes recording Willow Flycatcher in Maine.
Cape Neddick220121983
Wilson Mills219901990
Otisfield Gr220002000
Charleston220141991
Wytopitlock219961993
Benedicta219931993
Westbrook120141985
Biddeford120081989
Kittery Pt120131983
Turner120101986
Greenwood120212008
Reeds120222022
Hartford120191978
Bowdoin Ctr120042004
Manchester119831978
Warren119891988
Brooks120191993
Hermon119841982
Hancock120091970
Cooper119811980
Carrabassett120212021
Medway119921991
Hudson120002000
Ashland119861984
Cornville120222022

Willow Flycatcher Population Trend in Other States

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

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