Colorado Springs police urged people to stay indoors today because of whiteout conditions.
Interstate 25 was closed between Denver and Colorado Springs and between Pueblo and Trinidad. Troopers had to rescue some stranded drivers.
Traffic on eastbound I-70 just west of Denver is stop-and-go because of multiple accidents and vehicles sliding off the highway as skiers returned from the slopes.
The road to Denver International Airport also was treacherous. Airport personnel and police had to pick up some drivers who abandoned their vehicles.
Colorado Transportation Department spokeswoman Stacey Stegman said more highways were being closed as the storm dragged on. Nearly 90 state plows were on the roads in the Denver area. Stegman didn't have a total statewide.
Stegman said The biggest problems crews are facing is that visibility is so bad people are just stopping on the road and snow plows risk running into them. She said drivers should make sure they get off the road when they stop.