OSS/CIA 50 Mile Night Run

The OSS/CIA 50 Mile Night Run is a unique endurance event held in Prince William Forest Park, Virginia, a historic site used for training spies during World War II. Participants tackle a challenging 50-mile course, consisting of a 25+ mile loop run twice, primarily on single-track trails. The event features fully-stocked aid stations and allows pacers starting from the second loop.

In 2023, a night marathon was introduced, providing runners with a thrilling nighttime experience. The park, established in 1936, offers a scenic backdrop with over 37 miles of trails across its expansive 15,000+ acres. Visit the organization's website for the most recent information.