Chicago, Illinois — A sharp late-season cold snap will settle across Illinois beginning Friday, May 8, bringing freezing overnight temperatures that could disrupt travel and threaten early-season crops across Chicago, Peoria, Springfield, Rockford, and Champaign.
According to NOAA’s Climate Prediction Center, temperatures will run 50–60% below normal through May 14, with the coldest air arriving Friday night into early Saturday. The most critical window is from 1 a.m. to 8 a.m. Saturday, when temperatures are expected to fall to or below 32 degrees statewide.
That drop will create immediate impacts. Frost is likely to form quickly on exposed surfaces, including bridges and overpasses along I-90, I-55, and I-57, increasing the risk of slick spots for early morning drivers. Rural and low-lying areas near Peoria and Champaign may see colder pockets where freezing conditions linger longer, raising the risk of crop damage and stressing newly planted fields.
Light rain moving through Friday night could leave roads damp, allowing cold air to create patchy slick conditions before sunrise. Low-lying roads and flood-prone intersections in Chicago, especially underpasses and drainage areas, may see minor water pooling that adds to travel hazards within minutes.
This is part of a broader stretch of unseasonably cold air covering much of the eastern United States during this period, pushing deep into the Midwest.
Drivers should use caution on bridges and shaded roads early Saturday and avoid untreated surfaces where slick spots develop. Farmers and residents should cover sensitive plants and protect outdoor vegetation.
The highest risk for freezing temperatures and travel impacts peaks early Saturday between 1 a.m. and 8 a.m.
