Mountains-to-Sea Trail 50K Challenge
Durham, United States • 12 Apr 2026
Mountains-to-Sea Trail 12M & 50K Challenge
The Mountains-to-Sea Trail 12M & 50K Challenge is an annual trail running event held in Durham, North Carolina. The race utilizes the single-track paths of the Mountains-to-Sea Trail (MST), winding through wooded areas along the Eno River. Participants navigate a natural hiking trail environment that includes technical elements such as rocks, roots, logs, and quick turns.
The event offers two primary distances:
- 50 km
- 12 miles (noted as closer to 13 miles due to course updates)
Both races start and finish at Riverside High School, with the course featuring well-marked trails and aid stations positioned approximately every 3 to 4 miles. These stations provide water, electrolyte drinks, energy gels, and snacks. The 50 km distance has an 8-hour time limit and allows for drop bags to be used at the turn-around point. The 12 mile race has a 3.5-hour time limit.
Awards are presented to the top three overall male and female finishers, as well as the top masters finishers in both categories. All participants who complete their respective distance receive a finishers award. A team challenge is also available for groups of five runners, with scoring based on combined overall finish positions.
Course logistics include parking at the school and access to restroom facilities at the start/finish area. Packet pickup is available locally on the day before the race and on the morning of the event. Visit the organization's website for the most recent information.