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

Warbling Vireo Population Trend in Illinois

All statesForest birds

Warbling Vireo in Illinois has surged: up 155% on the route-weighted index since 1968.

+155%Since 1968
104Routes In State
58Years

Notable Warbling Vireo Trends in Illinois

long arc increasecomputed index

Warbling Vireo has surged in Illinois: up 155% on the route-weighted index since 1968.

Warbling Vireo Population Forecast in Illinois

If the recent trend holds, Warbling Vireo in Illinois is projected to rise about 19% by 2029 — from 4.1 in 2024 to a central estimate of 4.8 (95% range 3.7–6.0). A 5-year backtest shows a typical error of ±13.5%, with 60% of held-out values landing inside the 95% band.

+19%Change by 2029
4.8Projected 2029 index
3.7–6.095% range
±13.5%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
20254.63.55.8
20264.73.55.8
20274.73.65.9
20284.83.65.9
20294.83.76.0

Warbling Vireo Survey Routes in Illinois

Routes recording Warbling Vireo in Illinois.
Belleview3420241966
Guilford1620231967
Duncan Mills1220241993
Eldred1220211993
Chandlervill1120241971
Mackinaw1120241967
Brownville1120191993
York1020241994
Payson1020242000
Union1020172005
Bartonville920241973
Alden920232019
Eubanks920242001
Sherburnvill820231976
Terre Haute820241966
Williamsfld820241976
Birds820241976
Greenview820231995
Concord720241967
Martinsville720241976
St Morgan720221967
Clayton720242001
Wayne620241967
Janesville620241972
Bradbury620241972

Warbling Vireo Population Trend in Other States

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

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