A deep freeze set in across the Midwest on Sunday with low temperatures forecast in the single digits and a few below zero, turning the season's first major snow into ice that made some roads treacherous to travel.
After snow on Friday and Saturday across much of the region, temperatures plunged behind the front.
The National Weather Service forecast 20 degrees or lower across six states from North Dakota to Illinois.
Fargo, North Dakota, could dip to 11 degrees by early Sunday.
Madison, Wisconsin, could see 7 degrees and Des Moines 12.
Parts of Iowa, northwest Illinois and southern Wisconsin could reach below zero, the weather service said.
The first snowfall of the season brought amounts ranging from a few inches to 20 from South Dakota through Michigan earlier in the weekend.
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