like Breckenridge or Vail/Beaver Creek you may be able to get someone to visit you, but they'll y want a multi hour date., Check Eros, I remember seeing a few ladies who offer outcall to the mountains.
You can always post a 411 on the Colorado regional board or the ISO board, but the CO board is pretty sleepy.  Now if you're in Aspen, there is a certain private club downtown that's been  known to attact a working lady or two. Kind of like CGs in Vegas, except usaully a little higher class. If you're really "old school" check out the personnels section in the Aspen Daily News, I remember seeing a few ads  that looked interesting!  Finally,  as far as the post about Park City, the gentleman was right on, Salt Lake City has providers, but it ain't no Vegas. However, if you go during the Sundance Festival there is a chance that some providers will be there.

Without the link, you'd think it was another crackpot idea of mine.  There are no Olympic caliber slopes, but it's legitimate skiing and you have the benefit of the Vegas lifestyle.  You can drive to Brianhead, Utah for better snow but worse women.  It's about a 3 hour drive.