OSS/CIA 50 Mile Night Run

OSS/CIA 50 Mile Night Run - Triangle, VA

The OSS/CIA 50 Mile Night Run is a trail running event organized by Athletic Equation Trail Series at Telegraph Road Pavilion in Prince William Forest Park, Triangle, Virginia. The event offers multiple distance options.

• 50 miles
• 25 miles
• 10 miles

The main course is a 25+ mile loop run primarily on single track with some fire road sections and several bridge and National Park Service road crossings. The 25+ mile loop is run twice to create the 50+ mile distance. A night marathon was added to the event program beginning in 2023 and follows the same cut-off structure used for the 50 mile race.

Aid support includes two fully stocked main aid stations at Telegraph Road Pavilion and Oak Ridge Camp Ground, plus two smaller aid locations at the intersections of South Valley Trail and Scenic Drive, and Burma Road and Scenic Drive.

Crews are restricted to Telegraph Road Pavilion and must be present in the park and at the pavilion before nightfall. The National Park Service requested limited crew movement inside the park after crews settle for safety reasons. Pacers are allowed beginning on the second loop from Telegraph Road Pavilion.

Prince William Forest Park contains approximately 37 miles of trails across more than 15,000 acres and is the largest protected natural area in the Washington, D.C., metropolitan region. Visit the organization's website for the most recent information.