OSS/CIA 50 Mile Night Run

The OSS/CIA 50 Mile Night Run is a challenging ultramarathon held in Prince William Forest Park, Virginia, a historic site once used to train World War II OSS spies. The race features a 25+ mile loop primarily on single-track trails, fire roads, and several bridge and road crossings, which runners complete twice for the full 50 miles. A night marathon option covers one loop with an 8.5-hour cutoff.

Aid stations are strategically placed, including two main stations at the start/finish and halfway points, plus two mini-aid stations. Crews and pacers have specific restrictions to comply with park safety and permit rules. The event offers a unique blend of endurance running and rich historical atmosphere. Visit the organization's website for the most recent information.