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Triathlons in UK in September 2025

Find triathlons near me in UK in September 2025 - search by date or place, display on a map or use the advanced search to find your perfect race.

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

Taking THE ROC into the Lake District, this is an opportunity to test your resolve and focus in one of the most inspiring locations in Europe. Face up to the mountain.
  • Sat 6 Sep 2025
  • £210-£235
  • Sat 6 Sep 2025
  • £210-£235
Ulverston, Cumbria, UK

THE ROC ENGLAND

Taking THE ROC into the Lake District, this is an opportunity to test your resolve and focus in one of the most inspiring locations in Europe. Face up to the mountain.

  • Recycling
  • Plastic bottle free
  • Music
  • Chip timing
  • Enter online
  • Mountainous
  • Event village
  • Rural
  • Mountains
  • Sustainability policy
  • Plastic-free event
  • Age 18 & over
  • 1.5 km lake swimming
  • 92 km road cycling
  • 18.5 km multi terrain running
Get involved in this Grafham Triathlon, brought to you by the largest triathlon organiser in the UK!
  • Sat 13 Sep 2025
  • £73-£115
  • Sat 13 Sep 2025
  • £73-£115
Huntingdon, Cambridgeshire, UK

ATW Grafham Triathlon

Get involved in this Grafham Triathlon, brought to you by the largest triathlon organiser in the UK!

  • Recycling
  • Newcomers
  • Event village
  • Park
  • Sustainability policy
  • Age 15 & over
  • Sprint triathlon
  • Olympic triathlon
  • Standard aquabike
Join Aviemore Triathlon in the beautiful Cairngorms and enjoy an open water swim in the cool, calm waters of Loch Morlich and enjoy mountain biking and running on the trails of Glenmore Forest.
  • Sun 14 Sep 2025
  • £73-£98
  • Sun 14 Sep 2025
  • £73-£98
Aviemore, Highland, UK

Aviemore Triathlon

Join Aviemore Triathlon in the beautiful Cairngorms and enjoy an open water swim in the cool, calm waters of Loch Morlich and enjoy mountain biking and running on the trails of Glenmore Forest.

  • Recycling
  • Newcomers
  • Event village
  • Sustainability policy
  • Age 15 & over
  • Sprint triathlon
  • Olympic triathlon
Triathlons at Dawlish Warren, a safe and supported environment for sea swimming, with a range of triathlon distances to offer a great challenge in a scenic location.
  • Sun 21 Sep 2025
  • £42-£61
  • Sun 21 Sep 2025
  • £42-£61
Dawlish, Devon, UK

Dawlish Triathlon

Triathlons at Dawlish Warren, a safe and supported environment for sea swimming, with a range of triathlon distances to offer a great challenge in a scenic location.

  • Families
  • Trees not tees
  • Newcomers
  • Coast
  • Sustainability policy
  • Plastic-free event
  • Age 15 & over
  • Super sprint triathlon
  • Sprint triathlon
  • Sprint aquathlon
The Big East and Maldon Triathlon is brought to you by the largest triathlon organiser in the UK! A great experience featuring a tidal river swim.
  • Sun 21 Sep 2025
  • £73-£175
  • Sun 21 Sep 2025
  • £73-£175
Maldon, Essex, UK

ATW Big East & Maldon Triathlon

The Big East and Maldon Triathlon is brought to you by the largest triathlon organiser in the UK! A great experience featuring a tidal river swim.

  • Newcomers
  • Event village
  • Park
  • Age 15 & over
  • Sprint triathlon
  • Olympic triathlon
  • Standard aquabike
  • Half Ironman
  • Middle aquabike
  • Sun 14 Sep 2025
Nantwich, Cheshire, UK

North West Triathlon

  • Novice triathlon 2
  • Super sprint triathlon
  • Sprint triathlon
  • Sun 28 Sep 2025
Stratford-upon-Avon, Warwickshire, UK

Warwickshire Triathlon

  • Novice triathlon 2
  • Super sprint triathlon
  • Sprint triathlon

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