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100K ultra runs in UK in May 2026

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

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  • Sat 2 - Sun 3 May
  • £39-£199
Ventnor, Isle of Wight, UK

Isle of Wight Ultra Challenge

  • Trail run 3
  • 50K ultra run 3
  • 100K ultra run 2
  • Ultra run
  • Sat 2 May
  • £99
Brecon, Powys, UK

Rasus y Bannau | 100K Ultra

  • 100 km trail running
  • Sun 3 May
  • £77
Shipston-on-Stour, Warwickshire, UK

Tempo Trail Races | 100K Ultra

  • 100 km trail running + 6682 ft ascent
  • Sat 9 May
  • £118-£120
Chesham, Buckinghamshire, UK

Chiltern Hills 100K

  • 100 km trail running
  • Sat 16 - Sun 17 May
  • £39-£199
Wareham, Dorset, UK

Jurassic Coast Ultra Challenge

  • Trail run 2
  • 50K ultra run 2
  • 100K ultra run 2
  • Marathon
  • Ultra run
  • + 1 more race
  • Sat 23 - Sun 24 May
  • £89-£199
Brighton, East Sussex, UK

London 2 Brighton Ultra Challenge

  • Trail run 3
  • Ultra run 2
  • Marathon
  • 100K ultra run 2

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