Outdoor X12 Endurance Run

OCT
3
2026
Test your limits at this 12 hour endurance event in Dayton featuring a flat loop course through grass and trails. Run or ruck for the full duration to earn your finisher medal and pursue personalized mileage awards.
Sat 3 Oct 2026
2026 Outdoor X12 Hours En... 2026 Outdoor X12 Hours En...

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Event Overview

The Outdoor X12 Endurance Run & Ruck, also known as the OX12, is a time-based event held in Dayton. Produced in collaboration with Five Rivers Metroparks and the Subaru Outdoor Experience, the event focuses on total distance covered within a 12 hour period rather than a fixed race distance. Participants must remain on the course for the full duration to be considered finishers.

Course Details

The event takes place on a flat loop course measuring approximately 2.7 miles. The terrain consists of 96% grass or trail double track and 4% paved bike path. Because the event begins in the early morning, all participants are required to use a headlamp or flashlight at the start.

Event Categories

Participants can choose between two primary formats:

  • 12 Hour Endurance Run
  • 12 Hour Endurance Ruck

Amenities and Awards

A scoring table and a roped-off drop bag area are located at the start-finish line, allowing participants to refuel or change gear without leaving the official course. The aid station provides water, Tailwind Performance drink, and various food items such as PB&J, chips, and pretzels.

All registrants receive a t-shirt, provided they sign up before the cutoff date. Finisher medals are awarded to those who remain on the course for the entire 12 hours. Additionally, runners who exceed a total of 35 miles qualify for an engraved mileage award. Overall awards are presented to the top three male and female finishers. Visit the organization's website for the most recent information.

2026 Outdoor X12 Hours Endurance Run
2026 Outdoor X12 Hours Endurance Ruck