Logo

Operation Centurion

Silver Spring, United States • 30 May 2026

Operation CENTURION

Operation CENTURION is a long-distance endurance event held in the Washington D.C. region. The course is situated on the Rock Creek Trail, with the primary meeting point located at Meadowbrook Local Park.

Participants are required to complete a total distance of 100 miles. The event structure consists of 10 individual loops, with each loop measuring 10 miles. The route involves a total elevation gain of 6,790 feet, which averages approximately 679 feet of ascent per loop.

The event features a strict time limit for completion. All participants must finish the course within a 32-hour cutoff period. Registration is available under two categories:

  • Operation CENTURION Light
  • Operation CENTURION Standard

The event takes place over a two-day period in late May. The terrain follows the established Rock Creek Trail system, providing a consistent loop-based format for those attempting the full centurion distance. Visit the organization's website for the most recent information.

United States Maryland Silver Spring

Race information

Registration
100 mi
Operation Centurion
Operation Centurian Light
Operation Centurian Standard
Visit the organization's website for the most recent information.
Trail runs nearby

Breeze Thru the Trees 5k

Laytonsville

A 5k cross country run and 1 mile fun run through Ruppert Nurseries' 500 acre tree farm in Gaithersburg on March 22, 2026. Proceeds support the Montgomery County Children’s Opportunity Alliance.

Capital Backyard Ultra

Lorton

The Capital Backyard Ultra is a "last runner standing" race in Lorton, Virginia, capped at 60 runners. Competitors run a 4.167-mile loop every hour until only one remains. The winner receives a $1000 prize.

Rosaryville Half Marathon

Upper Marlboro

Experience a scenic trail run through the forests and fields of Rosaryville State Park. Choose from several distances on fast and smooth terrain located just off the Capital Beltway in Maryland.

Froggy Hollow 9

Clarksburg

Experience a timed trail ultra at Little Bennett Regional Park with 5 and 9 hour individual or relay options. Runners navigate a 4.4 mile loop supported by a fully stocked aid station in Clarksburg.