OSS/CIA 50 Mile Night Run

The OSS/CIA 50 Mile Night Run takes place on Saturday, June 13, 2026, starting from the Telegraph Road Pavilion in Triangle, Virginia. This event features a 50 mile, 25 mile night marathon, and 10 mile distance on the trails of Prince William Forest Park — the same grounds that trained Office of Strategic Services (OSS) spies during World War II, the predecessor to the Central Intelligence Agency (CIA).

Event Logistics & Participant Information:

• Registration Deadline: Closes Tuesday, June 9, 2026, at 11:59 PM ET.
• Location: Telegraph Road Pavilion, Prince William Forest Park, Triangle, Virginia.
• Park Background: Established in 1936, 15,000+ acres, 37 miles of trails. Largest protected natural area in the Washington, D.C., metropolitan region.
• Course Surface: Primarily single track, some fire road, several bridge and National Park Service road crossings.
• 50 Mile Format: 25+ mile loop run twice.
• Night Marathon Cutoffs: All 50 mile cutoffs incorporated into the night marathon event. 8 hours 35 minutes total.
• Aid Stations: Two fully-stocked main aid stations at start/finish (Telegraph Road Pavilion) and half-way point (Oak Ridge Camp Ground). Two mini-aid stations with smaller food selection, water, and Tailwind at South Valley Trail/Scenic Drive intersection and Burma Road/Scenic Drive intersection.
• Crew Access: Crews allowed only at Telegraph Road Pavilion start/finish line. National Park Service requires crews and pacers to be in the park and at the pavilion before nightfall for safety. Non-compliance jeopardizes future permits.
• Pacers: Allowed for all runners beginning at the second loop from Telegraph Road Pavilion.
• Refund/Transfer Policy: Not specified — check with organizer via UltraSignup.

Route, History & Atmosphere:

• Historical Significance: Prince William Forest Park was a primary training location for OSS spies during WWII, preparing agents for infiltration into enemy territory in Asian and European theatres.
• Spy Training Heritage: Roads and trails pay tribute to the park's history as the United States' first training center for spies. Original cabins used by "nameless" soldiers are still present in certain camping areas.
• Night Running: 50 mile event starts at 6:00 PM, running through the night. Night marathon starts at 11:55 PM.
• Scenic Setting: Trails through the largest protected natural area in the DC metropolitan region.
• Event Series: Part of Athletic Equation Trail Series.
• Community Compliance: Participants urged to follow crew/pacer rules to maintain park permits for future events.
• Results History: Available dating back to 2012.

The OSS/CIA 50 Mile Night Run on June 13, 2026, in Triangle, Virginia, sends runners through historic spy-training grounds under darkness — a night-time ultra on the trails where America's first clandestine intelligence officers prepared for World War II.