The Capital Backyard Ultra is pleased to announce that we are a Golden Ticket Event for the World Championship Backyard Ultra, Big's, in Bell Buckle TN! The winner of the Capital Backyard Ultra will receive paid entry to Big's, plus a $200 travel stipend.

In the true spirit of Big’s, the Capital Backyard Ultra will take place in my backyard in Potomac, MD, a suburb of Washington, DC. There will be a daytime loop on single track and a nighttime loop on the road. Each loop will be 4.167 miles, allowing runners to achieve one hundred miles in a 24 hour period. Timing and results will be provided by Mike Melton of MCMTiming. The race is for you, the runner, to push your limits and see what you can truly achieve.

The Capital Backyard Ultra will begin at 8am on Saturday, May 23, 2020, and proceed until only one runner is remaining. 

The format is a 4.167 mile loop that will begin on the hour, every hour. Three minutes before the start of each loop (three minutes before the top of the hour) three whistles will be blown. Two minutes before the top of the hour, two whistles will be blown. One minute before the top of the hour, one whistle will be blown. A bell will ring signifying the start of each round. All runners continuing must be present when the final bell rings.

As stated above, all runners must be in the race corral at the start of the hour, or they will not be allowed to continue. They are not allowed to exit the course except to use the porta potty, until they complete the loop. It’s very simple. However ”Simple” does not equate to “Easy.”

The last runner must complete one additional loop to be named the winner. All other runners are DNFs, but they will know that they have truly reached the limit of their endurance. The “winner” will not have this satisfaction but will have another opportunity to find their limit at Big’s in October.

Upcoming Races

May 28 2022
Variable Hours
Multiple Loop Course
3 Elevation Rating
Hilly, ~2500-7500 feet in 50 miles
3 Surface Rating
Some rocks, root, and/or ruts


Variable Hours

View course top times
Date Finishers Top Result (M) Top Result (F)
05/29/21 42 237.5 91.66
08/01/20 19 112.5 75
We try to keep the most accurate information about this race, but changes do happen. Always visit the official race website for the most up to date information. If you see an error, please let us know

Dahlgren Heritage Rail Trail 50K

  • Aug 6, 2022
  • King George, VA
50 KM