100 Mile Ultra Marathons
Welcome to the GB Ultras 100 Mile Ultramarathon Race Series! Supported 100 Mile Ultramarathons taking you to fantastic trails in England, Scotland & Wales with incredible GB Ultras® Support at checkpoints and live online tracking from GB Race Tracker. Take on any of the races on their own, or take them all on for the Grand Slam!
All our 100 Mile events attain ITRA and UTMB Mountain Points on completion…
Up Next is Chester Ultra 100 Mile
Chester Ultra 100
18/04/2026
8th Edition | 100 Miles | 32 Hours | 1509m Elevation | 400 Places
£209
Ultra Scotland 100
06/06/2026
6th Edition | 104 Miles | 38 Hours | 4611m Elevation | 200 Places
£209
Beacons Way Ultra 100
25/07/2026
7th Edition | 100 Miles | 40 Hours | 6143m Elevation | 200 Places
£209
Yr Wyddfa Snowdon Ultra 100
05/09/2026
8th Edition | 102 Miles | 40 Hours | 5788m Elevation
£209
Cheshire Ring Ultra 100
26/09/2026
2nd Edition | 102 Miles | 30 Hours | 340m Approx Elevation | Limited Places
£209
Part Of The 100 Mile Grand Slam
Take on all 5 of our 100 Mile Ultra Marathons for the Grand Slam Buckle & get in to the Hall of Fame.
