Unfortunately noaa, weather channel. etc. report from towns, not mountains that can be 2000+ feet higher.
The other key variable is exposure. If it faces north it's not getting any sun at this time of year, and the only way you get ice if it rains and freezes, a true rarity in Colorado. You can get some hardpack and occasionally frozen granular with heavy traffic and high water content or man-made snow.
If it faces south you want the temperature to stay below about 20F. East and west exposures hold up fairly well at this time of year.
I've been observing this process at Mammoth, which is similar in altitude and snowfall range to Vail, for 28 years and it's rare to see any kind of deteriorating snow surface in December/January. If it's covered, it should be fine.