The extreme cold has been particularly rough for regions not used to prolonged periods of ice and wind chills, including Tennessee, Kentucky and Arkansas.
Parts of Pennsylvania and New Jersey were expected to get as much as two inches of snow per hour, forecasters said. Officials cautioned against unnecessary travel through Sunday.
The weather system barreled through a stretch from Georgia to New York, disrupting travel, downing trees and power lines and leaving more than a million homes and businesses without power.