Course
A 4.167-mile loop just outside Crickhowell in the Black Mountains, repeated on the hour in last-one-standing format over 12 hours. The loop is roughly half trail and half tarmac, with one gradual climb and a short steep section; the rest is relatively flat and fast.
Key dates
- ★Race daySeptember 2027 · date to be announced
About
The Trails & Tarmac 12 Hour Summer Back Yard Ultra is a last one standing endurance race in the Black Mountains, Wales. Competitors must consecutively run a 4.2 mile lap in less than one hour, every hour, with the final lap being a unique sprint race in reverse direction.
Save Trails & Tarmac 12 Hour Summer Back Yard Ultra to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.