OSS/CIA 50 Mile Night Run
Triangle, United States • 13 Jun 2026
Event overview
The OSS/CIA 50 Mile Night Run takes place at Telegraph Road Pavilion in Triangle, Virginia, inside Prince William Forest Park. Registration closes Tue, Jun 9 @ 11:59 PM ET. The event offers these distances:
- 50 miles
- 25 miles
Course, support and rules
The course is a 25+ mile loop run primarily on single track, with some fire road and several bridge and National Park Service road crossings. The 25+ mile loop is run twice for the 50+ mile distance. A night marathon option was added in 2023 that uses the single loop and has a set time limit; all 50 mile cut-offs apply to that event.
There are two fully stocked main aid stations at the start/finish (Telegraph Road Pavilion) and at the halfway point of each loop (Oak Ridge Campground). Two additional mini-aid stations provide a smaller selection of food, water, and Tailwind at the South Valley Trail intersection with Scenic Drive and at the Burma Road intersection with Scenic Drive. Crews are permitted only at Telegraph Road Pavilion and must be in the park before night fall. Pacers are allowed beginning on the second loop from Telegraph Road Pavilion. Prince William Forest Park has 37 miles of trails on more than 15,000 acres. Visit the organization's website for the most recent information.