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Species · Illinois · BBS 2025 Release · 1966–2024

Carolina Chickadee Population Trend in Illinois

All statesForest birds

Carolina Chickadee in Illinois has surged: up 411% on the route-weighted index since 1968.

+411%Since 1968
40Routes In State
58Years

Notable Carolina Chickadee Trends in Illinois

long arc increasecomputed index

Carolina Chickadee has surged in Illinois: up 411% on the route-weighted index since 1968.

Carolina Chickadee Population Forecast in Illinois

If the recent trend holds, Carolina Chickadee in Illinois is projected to fall about 22% by 2029 — from 1.8 in 2024 to a central estimate of 1.4 (95% range 0.89–2.0). A 5-year backtest shows a typical error of ±29.1%, with 60% of held-out values landing inside the 95% band.

-22%Change by 2029
1.4Projected 2029 index
0.89–2.095% range
±29.1%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
20251.40.831.9
20261.40.841.9
20271.40.861.9
20281.40.881.9
20291.40.892.0

Carolina Chickadee Survey Routes in Illinois

Routes recording Carolina Chickadee in Illinois.
Mt Vernon1420241971
Belknap1320241970
Bremen1220241969
Royalton1220242001
Bradbury1020241970
St Morgan1020221967
Pulaski1020241971
Birds820241976
Cave In Rock820241993
Grape Creek620242001
Mascoutah Lk620241978
Brnt Prairie620241977
Jamestown520231967
York520241993
Kell420242001
Brownville420241993
Janesville320241995
Beaverdam Lk320231970
Yale320241993
Beaucoup220241972
Olney220241966
Flora220191976
Delwood220241970
Robinson220231971
Marshall220242006

Carolina Chickadee Population Trend in Other States

alabamaarkansasdelawarefloridageorgiaindianakansaskentuckylouisianamarylandmississippimissourinew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniasouth-carolinatennesseetexasvirginiawest-virginia

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