SLC or Tahoe... but I would recommend Spring Break cause of better snow and more of a base lair, plus all the parks will be prime at that time. But Christmas would be dope too. In SLC you are 20-30 minutes away from either great park at park city, great terrain at snowbird, or in between at the canyons. At Tahoe you are close to Squaw and Alpine Meadows for terrain, and Northstar for park. idk about CO during Christmas Break, hopefully next year will be a good snow year so there will be a decent base by then.