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Half Ironman (middle distance) in South East

Find half ironman (middle distance) in South East in 2025/2026 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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A one-of-a-kind triathlon adventure from castle to coast – swim, bike, run and soak up the best of the North and South Downs, fully supported all the way, no navigation needed!
  • Sat 18 Jul 2026
  • £260-£290
  • Early bird
Windsor, Buckinghamshire, UK

Castle To Coast Triathlon

A one-of-a-kind triathlon adventure from castle to coast – swim, bike, run and soak up the best of the North and South Downs, fully supported all the way, no navigation needed!

Early bird on now

  • Newcomers
  • Chip timing
  • Enter online
  • Event village
  • Rural
  • Age 18 & over
  • 1.2 miles lake swimming
  • 66 miles road cycling + 3300 ft ascent
  • 14 miles trail running + 1300 ft ascent

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