The Roaring Fork Transportation Authority has been in operation since 1983, and functions as a Regional Transportation Authority (RTA). The RTA includes the communities of Aspen, Snowmass Village, Pitkin County, Basalt, and a portion of Eagle County, Carbondale, Glenwood Springs, and the newest member New Castle.

RFTA provides commuter bus service from Aspen to Glenwood Springs (Roaring Fork Valley), Glenwood to Rifle (Hogback), intracity service in Aspen and Glenwood Springs, ski shuttle service to the four Aspen Skiing Company ski areas, the Maroon Bells Guided Bus Tours, and a variety of other seasonal services.