Capital Backyard Ultra

Lorton, United States • 20 Mar 2027

Event Overview

The Capital Backyard Ultra is a high-level endurance event held at the Meadowood Special Recreation Management Area in Lorton, Virginia. This competition is limited to 65 athletes and is designed to support participants pursuing breakthrough distances. The event follows the traditional backyard ultra format, where runners must complete a 4.167-mile loop every hour.

The course features two distinct loops to accommodate different times of day:

  • Day Loop: Used from 7:00 AM to 7:00 PM, this 4.167-mile trail loop consists of flat, open fields for the first 0.7 miles, followed by dirt and crushed gravel bridle trails. It features an elevation gain of approximately 300-350 feet per loop.
  • Night Loop: Used from 7:00 PM to 7:00 AM, this 4.167-mile loop follows a paved bike path. It is rolling but mostly flat, with roughly 75 feet of elevation gain per loop.

Logistics and Staging

Participants stage under a large on-site pavilion that encloses the aid station and all runner sites, providing protection from weather. Crew setups are located seconds from the starting corral. Camping is available for runners and their crews starting Friday night. Parking is available on-site, with some spaces adjacent to the shelter.

Support and Rules

The aid station includes professional food service and refreshments. Entry includes a dedicated crew space, chef-supported race food, and official gear. Participants must be in the starting corral when the bell rings and may not receive personal aid or use trekking poles while on the course. The race continues until only one runner remains to complete a solo loop. Visit the organization's website for the most recent information.

Race information

4 mi
4.167 Mile Loop
Visit the organization's website for the most recent information.
Trail runs nearby

A *5K* trail race at Agricultural History Farm Park on June 28 as part of the MCRRC low-key series. Free for MCRRC members with a 2026 bib and chip; non-members pay $22 (18+) or $11.60 (under 18).

A free 5K fun run on July 4, 2026 organized by Great Falls TrailBlazers. The loop course goes through the woods, meets at the Great Falls Library, is open to all ages and is pet friendly.

Rock the Heat offers scenic 5 km and 10 km races on July 11, 2026, through Rock Creek Regional Park with multiple virtual options and a medal donation initiative for Medals4Mettle.

A 5K and 10K held at Nottoway Park in Vienna on July 11, 2026, with in-person and virtual entry options; published registration fees vary by entry date and include mandatory charges.

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