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Mountainous 100K ultra runs in UK

Find mountainous 100k ultra runs in UK in 2026/2027 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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Yr Wyddfa (Snowdon) is the highest mountain in England and Wales. Your challenge is to ascend and descend as many times as possible in 24 hours - solo or as a relay team.
  • Sat 11 - Sun 12 Jul
  • £129.99-£319.99
Caernarfon, Gwynedd, UK

Black Diamond Yr Wyddfa Snowdon24

Yr Wyddfa (Snowdon) is the highest mountain in England and Wales. Your challenge is to ascend and descend as many times as possible in 24 hours - solo or as a relay team.

  • 24 hrs trail running + 3182 ft ascent
  • Chip timing
  • Enter online
  • Mountainous
  • Traffic free
  • Relay
  • Age 18 & over
A runnable 100km with a Scottish Highland journey at the heart of the race experience with an exciting midnight mass start.
  • Sat 19 - Sun 20 Sep
  • £140-£200
Fort William, Highland, UK

Skyline Scotland | Skyline Scotland 100K

A runnable 100km with a Scottish Highland journey at the heart of the race experience with an exciting midnight mass start.

  • 106 km trail running + 6350 m ascent
  • Enter online
  • GPS tracking
  • Mountainous
  • Age 18 & over
  • Sat 2 May
  • £99
Brecon, Powys, UK

Rasus y Bannau | 100K Ultra

  • 100 km trail running
  • Sat 6 - Sun 7 Jun
  • £39-£199
Kendal, Cumbria, UK

Lake District Ultra Challenge

  • Trail run 2
  • 50K ultra run 2
  • 100K ultra run 2
  • Marathon
  • Mon 7 - Sat 12 Sep
  • £1,699-£2,099
Conwy, Clwyd, UK

Dragon’s Back Race

  • 6 days fell running

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