There are plenty of options to get to Aspen/Snowmass, even as crews working to get two lanes open on I-70 in Glenwood Canyon. A rockslide temporarily closed the interstate to visitors driving from Denver International or Eagle Airports. Progress updates are regularly provided by Colorado Department of Transportations. See link below.
Aspen officials say more than half of the resort region's visitors arrive directly into Aspen/Pitkin County Airport and are unaffected by the slide. But, there are reportedly seats available into Aspen airport for those who are affected, and travelers will likely be able to reroute or add a leg to their flights. The airport is three miles from downtown Aspen and most lodging properties offer courtesy transportation.
Other airport options include Grand Junction Walker Field (124 miles); Montrose County Airport (135 miles); Yampa Valley Regional Airport (174 miles); and Gunnison County Airport (199 miles).
Shuttle services are still providing service from the east. There is a detour route around the closure area. Amtrak trains depart from Denver's Union Station at 8:05 a.m. and arrive at Glenwood Springs at 1:53 p.m. Tickets are $39 one way and various shuttles, taxis, rental cars, and buses are available for the 45-minute ride to the resort.