OSS/CIA 50 Mile Night Run
Triangle, United States • 13 Jun 2026
OSS/CIA 50 Mile Night Run
The event is a trail running series held at Prince William Forest Park in Triangle, VA. It offers multiple distances:
- 50 Miler
- 25M
- 10 Miler
The 50 mile course is a 25+ mile loop run twice to reach 50+ miles. The terrain is primarily single track with sections of fire road and several bridge and National Park Service road crossings. A night marathon was added in 2023 as a one-loop event with an 8 hour 35 minute completion window; the same cut-offs used for the 50 mile apply to that night marathon.
Aid support includes two fully stocked main aid stations at Telegraph Road Pavilion (start/finish) and at Oak Ridge Camp Ground as the loop halfway point. Two additional mini-aid stations provide a smaller selection of food, water, and Tailwind where South Valley Trail intersects Scenic Drive and where Burma Road intersects Scenic Drive.
Crew and pacer policies are restricted by the Park. Crews are allowed only at the Telegraph Road Pavilion and must be present in the Park and at the pavilion before night fall. Pacers are permitted beginning on the second loop from Telegraph Road Pavilion. The park itself was established in 1936, contains about 37 miles of trails across more than 15,000 acres, and is the largest protected natural area in the Washington, D.C., region. Visit the organization's website for the most recent information.