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Triathlons in Wales in Summer

Find triathlons in Wales in Summer - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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The most iconic multi-sport adventure race in Wales, combining a lake swim, brutal mountain climbs and a demanding run through Snowdonia’s dramatic, awe-inspiring landscape.
  • Sun 14 Jun 2026
  • £85.99-£449.99
Caernarfon, Gwynedd, UK

Slateman Triathlon & Duathlon

The most iconic multi-sport adventure race in Wales, combining a lake swim, brutal mountain climbs and a demanding run through Snowdonia’s dramatic, awe-inspiring landscape.

  • Carbon offset
  • Recycling
  • Beginner-friendly
  • Plastic bottle free
  • Dogs allowed at venue
  • Music
  • Event village
  • Rural
  • Mountains
  • Free venue entry
  • Sustainability policy
  • Public transport links
  • Age 17 & over
  • Sprint triathlon
  • Olympic triathlon
  • Half Ironman
  • Ironman
  • Standard duathlon

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