Generally, February is when the good months start ramping up. I never advise a trip out west prior to mid-February. I, too, have to go with Utah due to higher snowfall averages. Plus, the resorts are so much easier to get to than CO. Flying into Denver, then driving 3 hours to Steamboat, 2 hours to Summit, then 2 hours back to DEN....no thanks!
One thing Colorado has going for it better than Utah is the "Resort" feel. Vail, Steamboat, Breck are all pretty cool towns. All utah has for a "Ski Town" is Park City, and that is on the drier side of the range.
Traveling the States and Taking Pictures