KEYS100 Ultramarathon
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KEYS100 Ultramarathon - May 16 to 17, 2026
KEYS100 is a point-to-point ultramarathon across the islands of the Florida Keys, finishing at Higgs Beach in Key West. It is staged on pavement: roughly 75% of the route uses paved bike paths or sidewalks and the remainder is on the road shoulder facing traffic. The race spans multiple distances and team formats.
Individual runners must be supported by a crew and may only meet crews at approved meet-up locations. There are no aid stations or water stops along the course; runners and teams are expected to be self-sufficient and may resupply at locations along the route. Race marshals, medical staff, and timing stations are placed on course to monitor safety and rules compliance.
Safety and equipment rules are enforced, including visible reflective wear and required night lighting when operating outside vehicles at night. Support vehicles are regulated; each runner or team may use only one registered vehicle and must follow vehicle size and parking rules. Time limits apply to each distance and interim cutoffs are enforced.
Events include:
- 100 miles point-to-point from Key Largo to Key West
- 50 miles Marathon to Key West
- 50 kilometers Big Pine Key to Key West
- 100 mile team relay up to six runners
- 50 mile team relay up to three runners
A race orientation video and a published race guide cover detailed meet-up locations, rules, and timing instructions. Visit the organization's website for the most recent information.
