KEYS100 Ultramarathon

KEYS100 Ultramarathon is a 100-mile point-to-point race from Key Largo to Key West, Florida, with additional options of a 50-mile course from Marathon to Key West and a 50-kilometer race from Big Pine Key to Key West. Finish is at Higgs Beach in Key West. The course crosses the Florida Keys, offering turquoise waters and tropical scenery along the way, culminating in a festive finish-line atmosphere.

The event emphasizes self-sufficiency: there are no on-course aid stations; runners rely on a dedicated support crew that leap-frogs between approved meet-up locations to provide water, food, ice, and gear. Marshals, medical staff, and timing oversee safety, with a post-race celebration at Higgs Beach. Visit the organization's website for the most recent information.