3 races
Event overview
This unique endurance challenge tests your grit, pacing, and determination. With no set finish line, it’s a battle of mind and body — how many loops can you conquer before time runs out?
£250 prize for the winner and free entry to the summer Suffolk Back Yard Ultra for the winner and assist.
Highlights
- Run 4.167 miles every hour on the hour
- No set finish line — the last runner standing wins
- Beautiful Suffolk countryside course
- Festival atmosphere with camping and support areas
- Ideal for runners who love endurance, strategy, and mental challenge
Event photos
Event video
- Average fitness
- Event village
- Families
- Newcomers
- Superfit
Timetable
- Camping
- Paid parking
Event HQ
High Lodge
Brandon
Suffolk
IP27 0AF
UK
Free camping
Runners and crews camp for free but please keep tent/gazebo sizes to the smallest size possible.
There are two camping areas either side of the start area and route in and out of the field for runners. When you arrive you will be shown where to place your tent so we can get everyone camped safely. You will not pick where you are camped, but may move as numbers reduce to a space closer to the start.
There is no facility to pitch tents or camp on Friday night. No pets. No smoking.
There can be no stoves or cooking of any kind in or around the tents under any circumstances, as the forest is subject to strict fire rules.
Flattest backyard. As usual a great event. Super atmosphere, very friendly crowd, whether runners, crews, or organisers. Nicolas G
Brilliant! So happy with my first BYU. This was my first BYU (and a first looped course generally) after a few "regular" ultramarathons under my belt. The course was perfect: very pretty and very easy. I kept thinking how lucky I was that my first ever BYU is in Thetford Forest. It's very tempting to come back sooner rather than later! Lyuba B
Great event, I will be back. Second time running the SBYU, enjoyed pushing the distance on a slightly easier course. Saul W
Large campsite with welcoming volunteers/marshalls. Great course with the "downhill" section at the start, then a small "hill" and many flat sections with a slight slope leading to the finish. Daniel M
Absolutely brilliant, fun, challenging, and well organised. Brilliant race as always, well organised, so much fun day and night. Food van was brilliant. Leon S
Races at event
- Sat 12 Sep 2026
- #1 of 3
12:00
Age 12 & over
£80
- 6 hrs trail running + 93 ft ascent
- Sat 12 Sep 2026
- #2 of 3
12:00
Age 18 & over
£100
- 12 hrs trail running + 93 ft ascent
- Sat 12 Sep 2026
- #3 of 3
12:00
Age 18 & over
£120
- 4.17 miles trail running + 93 ft ascent