KEYS100 Ultramarathon

The KEYS100 Ultramarathon is an annual running event held in the scenic Florida Keys, featuring a variety of race formats including a 100-mile individual ultra, 50-mile individual ultra, 50-kilometer individual ultra, and team relays for both 100 and 50 miles. Scheduled for May 17-18, 2025, this race offers participants a unique opportunity to traverse the beautiful islands of the Keys, with approximately 75% of the course off-road. The event emphasizes safety and sportsmanship, with strict rules regarding support crews and race conduct.

It promises a memorable experience in a stunning tropical setting. Visit the organization's website for the most recent information.