High Five 100 - Lake City, CO

The High Five 100 is an extreme ultra-endurance running challenge held in Lake City, Colorado. Covering an estimated 90 to 105 miles with over 40,000 feet of elevation gain, the course requires runners to summit five 14,000-foot peaks and six 13,000-foot peaks in the rugged San Juan Mountains. Participants must navigate to 24 specified proof points and checkpoints in order, choosing their own routes between them.

The event has no marked course, aid stations, or entry fee, and runners must complete the challenge within 48 hours to be recognized as finishers. Designed for highly experienced mountain ultra runners, it emphasizes mental toughness, self-reliance, and respect for wilderness. Visit the organization's website for the most recent information.