OSS/CIA 50 Mile Night Run
Triangle, United States • 13 Jun 2026
OSS/CIA 50 Mile Night Run
The OSS/CIA 50 Mile Night Run is a trail event in Prince William Forest Park near Triangle, VA. The main course is a 25+ mile loop run twice to create the 50+ mile distance. The loop is primarily single track with some fire road and several bridge and National Park Service road crossings. A night marathon option covers one loop with an 8 hour 35 minute cutoff.
Distances:
- 50 Miler
- 25 Miler
- 10 Miler
Two fully stocked main aid stations are located at the start/finish area at Telegraph Road Pavilion and at the halfway point at Oak Ridge Camp Ground. Two additional mini-aid stations provide limited food, water, and Tailwind at the intersections of South Valley Trail and Scenic Drive, and Burma Road and Scenic Drive.
Crews are permitted only at Telegraph Road Pavilion and must be in the park and at the pavilion before nightfall. Pacers are allowed beginning on the second loop from Telegraph Road Pavilion. These access rules reflect National Park Service safety and permit considerations.
Prince William Forest Park 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. metropolitan region.
Registration closes Tue, Jun 9 at 11:59 PM ET. Visit the organization's website for the most recent information.