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

Acadian Flycatcher Population Trend in Illinois

All statesAerial insectivores

Acadian Flycatcher in Illinois has surged: up 447% on the route-weighted index since 1968.

+447%Since 1968
62Routes In State
58Years

Notable Acadian Flycatcher Trends in Illinois

long arc increasecomputed index

Acadian Flycatcher has surged in Illinois: up 447% on the route-weighted index since 1968.

Acadian Flycatcher Population Forecast in Illinois

If the recent trend holds, Acadian Flycatcher in Illinois is projected to fall about 32% by 2029 — from 1.6 in 2024 to a central estimate of 1.1 (95% range 0.45–1.7). A 5-year backtest shows a typical error of ±46.7%, with 20% of held-out values landing inside the 95% band.

-32%Change by 2029
1.1Projected 2029 index
0.45–1.795% range
±46.7%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
20251.00.401.7
20261.10.411.7
20271.10.421.7
20281.10.441.7
20291.10.451.7

Acadian Flycatcher Survey Routes in Illinois

Routes recording Acadian Flycatcher in Illinois.
Sandusky2220231993
Belleview2020241966
Bremen2020241969
Cave In Rock1820241993
York1320241993
Pulaski1220241970
Beaverdam Lk820231970
Delwood720241974
St Morgan520221967
Birds420241976
Belknap420241973
Chandlervill319721971
Bradbury320241983
Mascoutah Lk320241978
Marshall320242010
Guilford219991999
Payson220242006
Eubanks220242003
Athensville220221973
Pawnee219781967
Clarksdale220211968
Columbia220231966
Robinson220222021
Camp Point220232002
Royalton220242004

Acadian Flycatcher Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaindianaiowakansaskentuckylouisianamarylandmassachusettsmichiganminnesotamississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvirginiawest-virginiawisconsin

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