5
Half Ironman (middle distance) in UK in September 2025
Find half ironman (middle distance) near me in UK in September 2025 - filter by date or location, display on a map or use the advanced search to find your perfect race.
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- Sun 21 Sep
- £160-£180
Maldon, Essex, UK
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 + 1112 ft ascent
- 20 km trail running + 172 ft ascent
- Sun 28 Sep
- £245-£295
Edenbridge, Kent, UK
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 + 2392 ft ascent
- 21 km road running
- Sat 20 Sep
Caernarfon, Gwynedd, UK
The Brutal Extreme Triathlon | The Brutal Canol Half
- 1.2 miles lake swimming
- 57.98 miles road cycling
- 14.7 miles trail running
- Sun 21 Sep
Henley-on-Thames, Buckinghamshire, UK
The One on the River | Henley | Middle Distance Triathlon
- 1900 m river swimming
- 78.5 km road cycling
- 20 km trail running
- Sun 21 Sep
Llanfairpwllgwyngyll, Isle of Anglesey, UK
Superfeet Sandman Triathlon and Duathlon | Legend (70.3) Triathlon
- 1900 m sea swimming
- 93 km road cycling + 3175 ft ascent
- 19.8 km multi terrain running + 570 ft ascent