Half Ironman (middle distance) in UK in September 2025
Find half ironman (middle distance) 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.
- Sat 6 Sep
- £240-£260
- Sat 6 Sep
- £240-£260
THE ROC ENGLAND
Face up to the mountain in one of Europe's most inspiring locations. From Windermere to Coniston to summit England's highest mountain, if you love a tough and rewarding challenge - you'll thrive.
- 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
- Sun 21 Sep
- £160-£180
- Sun 21 Sep
- £160-£180
Big East Middle Distance 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.
- Enter online
- Undulating
- Age 18 & over
- 1500 m river swimming
- 86 km road cycling
- 20 km trail running
- Sun 28 Sep
- £245-£295
- Sun 28 Sep
- £245-£295
Hever Castle | Gauntlet Triathlon
Not for the faint hearted, this race pushes competitors to their limits whilst visiting every corner of the beautiful castle estate and its surrounding rural area into the High Weald AONB.
- Chip timing
- Enter online
- Age 18 & over
- 1.9 km lake swimming
- 90 km road cycling
- 21 km road running
- Sun 14 Sep
IRONMAN 70.3 Weymouth
- 1.2 miles sea swimming
- 56 miles road cycling
- 13.1 miles road running
- Sat 20 Sep
The Brutal Extreme Triathlon | The Brutal Canol Half
- 1.2 miles lake swimming
- 57.98 miles road cycling
- 14.7 miles trail running