The Aspen Backcountry by Aravaipa Running Colorado is a premier mountain trail event set in Aspen, Colorado, offering a 50K ultra, a full marathon, and a "heavy half" distance. The courses start and finish at Rio Grande Park, featuring challenging climbs like Sunnyside and descents such as Smuggler, providing runners with expansive views of the Elk Mountains. The event coincides with Aspen’s Annual Duck Derby, creating a festive atmosphere with food trucks, live music, and family-friendly activities. Organized by Aravaipa Running in collaboration with the City of Aspen and local trail runner Jeff Colt, the race emphasizes community involvement and celebrates the rugged beauty of the backcountry. ​