Join us on Saturday 3rd May 2025 for the Mapledurham Backyard Ultra!

This last man standing event is perfect for seasoned ultra runners and those wanting to dip their toes into the world of endurance running.

The 4.167mi/6.706km loop will have you running from Mapledurham house up and through Chazey Woods and back on the hour every hour, until one person remains. This makes everyone else a DNF!

We’ve spent hours in these woods making sure it’s as enjoyable to run on as possible, and hope that you take as much value from this course and the surroundings as we do.

Venue opens: 07:00

Registration from: 07:15 – 10:15

Race briefing: 10:30

Race start: 11:00

Aside from the running, you’ll find a busy race village, stocked with hot and cold water and snacks where you can refuel between each lap. We highly recommend bringing your own food.

There will be plenty of space to set up support tents and a camping area for those who wish to stay the night. There is an easily accessible car park with enough room for camper/caravans.

Make sure to follow us on Instagram (@cgtrails) for race updates and keep reading for more information about the Backyard format!

  • Paved section of the Backyard Ultra course
  • Run through the woods at Mapledurham Backyard Ultra
  • Run through fields at Mapledurham Backyard Ultra
  • Sunset in the woods at Mapledurham Backyard Ultra
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Mapledurham House, Reading, RG4 7TR

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What is a Backyard Ultra?

The event was created by Gary ‘Lazarus Lake’ Cantrell. It is a form of ultramarathon race where runners must consecutively run the distance of 6.7056km (4.167 miles) in less than one hour. Runners who are not back at the start line for the next lap are disqualified. There can only be one winner and all other runners will receive a DNF.

What are the specific rules?

  • The course must be at least 4 miles 880 feet in length (6.7056km).

  • The starting corral will stay the same size throughout the event. All participants must be inside the starting corral at the sound of the bell or you are disqualified.

  • Each loop will start exactly 1 hour after the last. There will be a warning of 3, 2 and 1 minutes prior to start.

  • With the exception of restrooms, all competitors must not leave the course until each loop has been completed.

  • Non-competitors may not be on the course (this includes any eliminated runners) and includes no personal aid during a loop.

  • Each loop must be competed within an hour.

  • No artificial aids, e.g. trekking poles.

  • Slower runners must allow faster runners to pass.

  • There can only be one winner! The winner is the last person to complete a loop. If no runner can complete one more loop than anyone else, there is no winner.

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