KEYS100 Ultramarathon

The KEYS100 Ultramarathon is an annual running event taking place across the scenic Florida Keys, specifically from May 17 to May 18, 2025. This ultramarathon features multiple race options, including a 100-mile individual ultra, a 50-mile individual ultra, a 50-kilometer individual ultra, and team relays for both 100 and 50 miles. The course is primarily off-road, with a small portion on the road shoulder.

Participants can enjoy the beautiful sub-tropical environment while engaging in a challenging race that promotes camaraderie and sportsmanship. The event is well-supported, with safety measures and rules in place to ensure a fair experience for all runners. Visit the organization's website for the most recent information.