2026 Outdoor X12 Endurance Run & Ruck

The Outdoor X12 Endurance Run & Ruck, or OX12, is a 12-hour loop race associated with Five Rivers Metroparks and the Subaru Outdoor Experience. Participants run or ruck a flat 2.7-mile-plus loop for up to 12 hours. The course consists mostly of grass and trail double track, with a short section on a bike path. Medals are awarded to those who complete the full 12 hours on the course, recognizing consistent effort as much as pace.