Freefall--Welcome to EpicSki!
Any of those towns (Frisco, Silverthorne, Dillon) is a good bet if you want to ski all the Summit County areas as well as Vail and Beaver Creek (and Loveland--a great little resort only 10 miles east of Silverthorne). Dillon & Silverthorne share an exit off I-70, about 5 miles from the east Frisco exit, so driving time differences to any of the resorts are minimal. Vail and Beaver Creek, as mentioned, are on the other side of Vail Pass, thirty (Vail) to forty-five (BC) miles away. The roads (Interstate 70) are fine most of the time, even when it snows, but they can
get really, really nasty every once in a while!
Summit is the highest county in all of Colorado, so altitude is always something to think about. Silverthorne is the lowest town in Summit County, but still about 8800 feet. (Although the towns share a border, Dillon is actually the "new" town of Dillon, sitting on the shores of the reservoir that now drowns the original town. Silverthorne is several hundred feet lower, downstream from the dam on the Blue River. Those few hundred feet actually can make a difference.)
If you have any concerns about altitude at all (and perhaps you should if it is your first time--or even if it isn't), it's always a good idea to bring them up with a knowledgeable physician. Few people suffer more than a headache and some discomfort the first day or two up here, and most have no problem at all. There are things your doctor can prescribe that may help, though.
You might PM dp
, our "resident" physician and altitude expert here at EpicSki, if you would like more advice about AMS (acute mountain sickness). Better yet, start a new public thread with your question--it will be of interest to many!