The extreme cold temperatures combined with the wind are making it dangerous to be outside for even a short amount of time.
The metro saw lows of 6 below zero, with a wind chill of negative 28 early Thursday morning.
That had schools changing plans to keep students out of the elements.
The Des Moines, Waukee, Nevada, and Marshalltown school districts were among those that cancelled classes Thursday, deciding against making students walk to school or stand outside waiting at the bus stop.
Most other school districts decided on a two hour delay. That includes Ames, West Des Moines, Urbandale, Pella, Winterset and a long list of other schools. You can view all the closings and delays here.