15 Triathlons in Gwynedd

Find triathlons in and around Gwynedd for 2024/2025 - search by date or place, display on a map or use the advanced search to find your perfect race.

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Events calendar

Click an event for full event details, location, route, sustainability, what's included and how to enter.

The totally unique ROC format, from Abersoch Bay to the top of Wales’ highest mountain and back. Swim, Bike, Mountain, Bike, Run; THE ROC WALES is triathlon - tough and redefined.
  • Sat 11 May
  • £230-£240
Pwllheli, Gwynedd, UK

THE ROC WALES

The totally unique ROC format, from Abersoch Bay to the top of Wales’ highest mountain and back. Swim, Bike, Mountain, Bike, Run; THE ROC WALES is triathlon - tough and redefined.

  • 1.5 km sea swimming
  • 100 km road cycling
  • 13 km multi terrain running + 3330 ft ascent
  • Sun 9 Jun
  • £89.99-£249.99
Caernarfon, Gwynedd, UK

Slateman Triathlon and Duathlon

The most iconic adventure triathlon and duathlon in Wales. Starting in Llanberis, the heart of Snowdonia’s industrial heritage this unparalleled race combines stunning scenery with epic challenges.

  • Sprint triathlon
  • Olympic triathlon
  • Half Ironman
  • Standard duathlon
  • Sat 22 Jun
  • £85
Pwllheli, Gwynedd, UK

Menai Holiday Cottages Abersoch Triathlon

The Abersoch Triathlon offers a fantastic challenge in a stunning location, loved by all levels of triathletes, finishing on Abersoch Beach.

  • Sprint triathlon
  • Olympic triathlon
  • Sat 7 Sep
  • £185-£560
Caernarfon, Gwynedd, UK

The Brutal Extreme Triathlon

Take on one of the World’s Toughest Triathlons…

  • Half Ironman
  • Ironman 2
  • Sat 14 - Sun 15 Sep
  • £89.99-£249.99
Llanfairpwllgwyngyll, Isle of Anglesey, UK

Superfeet Sandman Triathlon and Duathlon

The final part of the Adventure Championships and a fitting close to the most epic multi-terrain, adventure triathlon and duathlon series in the calendar.

  • Sprint triathlon 2
  • Olympic triathlon 2
  • Half Ironman
  • Sprint duathlon
  • Standard duathlon
  • Sun 14 Apr
  • £66.99-£81.99
Harlech, Gwynedd, UK

Harlech Triathlon

Set under the castle's watchful eye, the Harlech Sprint Triathlon is one of the best loved races on the calendar.

  • 400 m pool swimming
  • 21.5 km road cycling
  • 5 km multi terrain running

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