The National Weather Service has issued a Frost Advisory from 11 p.m. Sunday to 8 a.m. Monday for many of Chicago's far western suburbs.
The areas under the warning include McHenry, Kane, Kendall, Lake, LaSalle and DeKalb counties.
WATCH: ABC7 AccuWeather Forecast
The National Weather Service said some areas could see temperatures fall around 32 degrees.
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Sunday evening Chicago is expected to see temperatures fall into the 40s with potential wind chills in the 30s.
Some towns in north central Illinois had traces of snow Monday.
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A Frost Advisory means that widespread frost is expected. Sensitive outdoor plants may be killed if left uncovered.