Outlast Denver

OUTLAST DENVER

OUTLAST Denver on 10/03/2026 is a six-hour trail endurance event at 11500 N. Roxborough Park Rd, Littleton, Colorado. The format requires runners to complete a 5K loop every hour, on the hour. Each lap must be finished within the hour to remain in the event; missing a lap results in elimination. Completing all six laps yields a total distance of 18 miles.

Courses are trail-based with natural terrain, including dirt, rocks, roots, and elevation changes; some sections may include pavement or gravel. Runners may walk as long as each 5K is finished within the allotted hour. There is time between laps for recovery, refueling, and adjustments.

Aid is available at the basecamp/loop start with water, basic hydration, and snacks. The event is cupless, so participants should bring their own bottle or hydration system. Participants may set up personal tents or aid stations at the venue.

Awards and recognition are based on combined times across the six laps. Finishers who complete 4 laps receive a “Grit Earned” patch, 5 laps earn a “Survivor” patch, and all six earn a premium OUTLAST medal and a premium OUTLAST tee. Local male and female winners are recorded for city placement and national leaderboard consideration. The fastest across all OUTLAST 6-hour events is crowned National Champion with a $1,000 prize. Visit the organization's website for the most recent information.