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

Willow Flycatcher Population Trend in Maryland

All statesAerial insectivores

Willow Flycatcher in Maryland has surged: up 239% on the route-weighted index since 1968.

+239%Since 1968
44Routes In State
58Years

Notable Willow Flycatcher Trends in Maryland

long arc increasecomputed index

Willow Flycatcher has surged in Maryland: up 239% on the route-weighted index since 1968.

Willow Flycatcher Population Forecast in Maryland

If the recent trend holds, Willow Flycatcher in Maryland is projected to rise about 113% by 2029 — from 0.45 in 2024 to a central estimate of 0.96 (95% range 0.30–1.6). A 5-year backtest shows a typical error of ±154.9%, with 20% of held-out values landing inside the 95% band.

+113%Change by 2029
0.96Projected 2029 index
0.30–1.695% range
±154.9%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
20250.930.271.6
20260.940.281.6
20270.950.281.6
20280.950.291.6
20290.960.301.6

Willow Flycatcher Survey Routes in Maryland

Routes recording Willow Flycatcher in Maryland.
Emmitsburg520241971
Mt Nebo419891973
Warfieldsbrg320181967
Eklo320181967
Floyd220231973
Vindex220211974
Williamsport220241975
Olney220241966
Pleasant Val220241970
Randallstown220131966
Cheltenham220031982
Madonna220192009
Honga220032003
Finzel220241996
Fair Hill219951993
Oldtown119731973
Potomac Park120241973
Smithsburg120141972
Wolfsville120241966
Silver Spg119881981
Bald Friar119961994
Bachman Mill120241971
Fowblesburg120161967
Upper Xrds120071970
Van Bibber120041973

Willow Flycatcher Population Trend in Other States

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

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