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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- Sat 13 Sep
- £120-£130
Sundowner 70.3 Triathlon
Bringing back the Sundowner 70.3 Triathlon! An unforgettable triathlon event at Allerthorpe Lakeland Park in Yorkshire is now back on the race calendar and 100% going ahead!
- Chip timing
- Enter online
- Flat
- Age 18 & over
- 1900 m lake swimming
- 90 km road cycling + 287 ft ascent
- 21 km trail running + 17 ft ascent
- 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 + 1112 ft ascent
- 20 km trail running + 172 ft ascent
- 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 + 2392 ft ascent
- 21 km road running
- Sun 7 Sep
The 1066 Triathlon | Middle Distance Triathlon
- 1900 m sea swimming
- 80 km road cycling + 1910 ft ascent
- 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
- Sun 21 Sep
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
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