From the National Weather Service, See forecast....
WINTER STORM WARNING IN EFFECT FROM NOON WEDNESDAY TO 6 AM MDT
FRIDAY...

* WHAT...Heavy snow possible. Total snow accumulations between 18 to
  36 inches, with isolated totals up to 48 inches possible. Heaviest
  amounts expected along the eastern slopes of the Front Range,
  lesser amounts will occur west of the Continental Divide. Winds
  could gust as high as 35 mph.

* WHERE...Rocky Mountain National Park and the Medicine Bow Range,
  the Mountains of Summit County, the Mosquito Range, the Indian
  Peaks, and the Front Range Foothills.

* WHEN...From noon Wednesday to 6 AM MDT Friday.

* IMPACTS...Snow covered roads will make travel very difficult to
  impossible, especially late Wednesday night through Thursday
  afternoon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. The latest road conditions for
Colorado can be obtained by calling 5 1 1 or by going to
www.cotrip.org.