Trails & Tarmac 12 Hour Summer Back Yard Ultra
The Trails & Tarmac 12 Hour Summer Back Yard Ultra on 19 September 2026 is a last one standing endurance race in the Black Mountains, Wales.
Competitors must consecutively run a 4.2 mile lap (yard) in less than one hour, every hour. The first 11 yards are the standard BYU format. The 12th and final yard is a sprint race to determine the winner… with a twist – the course direction is reversed.
Based just outside Crickhowell, the course is 50/50 Trail and Tarmac, with only one gradual climb and a short steep section, the rest is relatively flat terrain, which means fast.
Please refer to the event website for further details including associated rules.
Organiser
Distances/Events
1 x 4.2 mile lap per hour for 11 laps – 12th lap is a sprint to finish
Source: https://www.runningcalendar.co.uk/event/trails-tarmac-summer-back-yard-ultra/
Event Website: https://www.limitlesstrails.co.uk/trails-and-tarmac-12hr-byu
Coordinates: 51.8591153, -3.1371454