Outdoor X12 Endurance Run

The 2025 Outdoor X12 Endurance Run (OX12) takes place in Dayton, Ohio, at 1385 Harshman Road. The course is a flat 2.7+ mile loop with 4% bike path and 96% grass/trail double track. Produced with Five Rivers Metroparks and the Subaru Outdoor Experience, it is a time-based event awarding finisher medals to those who stay on course for 12 hours.

Features include a roped-off start/finish area, marked trail, restroom access, and a drop-bag area. Headlamps are required; snacks and drinks are provided. Awards are given for top male and female finishers. Visit the organization's website for the most recent information.