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OSS/CIA 50 Mile Night Run

Triangle, United States • 13 Jun 2026

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.

United States Virginia Triangle

Race information

Website Registration
50 mi
50 Miler
25 mi
25 Mile Night Marathon
Visit the organization's website for the most recent information.
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