Runners follow an out-and-back course for the Mountain Madness Half Marathon, which starts and finishes at the Howelsen Ice Arena on Howelsen Parkway. From there, runners head onto River Road and head south for the next 2 1/2 miles, until they turn onto Aspen Ridge Road. The course follows Aspen Ridge Road for the next three miles — and takes runners up and down the race’s steepest hill — before heading back onto River Road, and then back toward the race finish.
(MORE: Mountain Madness Half Marathon event details)