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100K ultra runs in UK in August 2025

Find 100k ultra runs near me in UK in August 2025 - search by date or place, display on a map or use the advanced search to find your perfect race.

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Visiting the heartland of the Scottish Borders, runners and walkers will take to the Borders Abbey Way to complete the full waymarked loop as individuals, teams or a relay of four.
  • Sat 23 Aug
  • £90-£108
  • Sat 23 Aug
  • £90-£108
Melrose, Scottish Borders, UK

Run the Borders | Full 109K

Visiting the heartland of the Scottish Borders, runners and walkers will take to the Borders Abbey Way to complete the full waymarked loop as individuals, teams or a relay of four.

  • Chip timing
  • Enter online
  • Hilly
  • Age 18 & over
  • 109 km trail running
  • Sat 9 Aug
Newmarket, Suffolk, UK

Stour Valley Path Ultra Run | 100K

  • 100 km trail running + 912 m ascent
  • Sat 16 - Sun 17 Aug
Northampton, Northamptonshire, UK

Foxton Hound Ultras | 100K

  • 100 km trail running

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