At least three people died and many were injured after multiple crashes and pileups.
The snow caused slippery and dangerous road conditions, prompting many law enforcement and traffic officials to advise travelers to stay off the roads.
Many stretches on highways and interstates had to be closed.
The Milwaukee County Sheriff's Department says one person died in a rollover crash on I43 at highway 100.
Dodge County officials also reported one fatality in the Town of Trenton after a semi trailer and a car collided.
A third person died in a crash on I94 just south of 2 Mile Road in the Town of Yorkville.