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

Sedge Wren Population Trend in Illinois

All statesGrassland birds

Sedge Wren in Illinois has fallen sharply: down 55% on the route-weighted index since 1969.

-55%Since 1969
54Routes In State
52Years

Notable Sedge Wren Trends in Illinois

long arc declinecomputed index

Sedge Wren has fallen sharply in Illinois: down 55% on the route-weighted index since 1969.

Sedge Wren Population Forecast in Illinois

If the recent trend holds, Sedge Wren in Illinois is projected to rise about 58% by 2029 — from 0.05 in 2024 to a central estimate of 0.08 (95% range 0.00–0.21). A 5-year backtest shows a typical error of ±261.6%, with 100% of held-out values landing inside the 95% band.

+58%Change by 2029
0.08Projected 2029 index
0.00–0.2195% range
±261.6%Backtest error
19672029
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
20250.080.000.21
20260.080.000.21
20270.080.000.21
20280.080.000.21
20290.080.000.21

Sedge Wren Survey Routes in Illinois

Routes recording Sedge Wren in Illinois.
Mascoutah Lk820132008
New Lenox419841981
Milford419971991
Keithsburg420072006
Sherburnvill319741967
Monticello320072006
Martinsville319991999
Beaucoup320161989
Guilford220011977
Cherry Val219931993
Geneseo220001984
Wayne220231969
Bluff Spgs219981998
Fairland219851985
Lake Summerset220222003
Jamestown220131997
St Morgan220221990
Eubanks220162004
Dudleyville220172007
Caledonia220241998
Yale219991999
York220052000
Darmstadt220132013
Alden220222022
Mill Creek120091967

Sedge Wren Population Trend in Other States

connecticutdelawareindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanew-hampshirenew-yorknorth-dakotaohiopennsylvaniasouth-dakotavermontvirginiawisconsin

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