Half Ironman (middle distance) in East of England
Find half ironman (middle distance) in East of England in 2025/2026 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.
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- Sat 16 May 2026
- £158-£178
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 24 May 2026
- £117-£137
ATW Box End Centurion 100km Triathlon
Conquer the ATW Centurion 100km Triathlon at Box End Lake — a thrilling endurance challenge featuring pristine open water, fast bike laps, scenic trails and unbeatable support.
- Enter online
- Undulating
- Age 18 & over
- 2250 m lake swimming
- 81 km road cycling + 1674 ft ascent
- 20 km trail running + 340 ft ascent
- Sun 7 Jun 2026
- £160-£180
ATW Grafman Middle Distance Triathlon
Take on a superb middle distance triathlon at the fantastic Grafham Water. Suitable for all abilites, with a challenging, but achievable course, and custom medal at the finish line.
- Chip timing
- Enter online
- Undulating
- Age 18 & over
- 1900 m lake swimming
- 90 km road cycling + 1680 ft ascent
- 21 km multi terrain running + 0 ft ascent
- Sun 5 Jul 2026
- £140-£160
ATW Odyssey At Box End Triathlon | Half Distance Triathlon
Get ready for one of the UK’s most exciting triathlon events of the year!
- Enter online
- PB
- Age 19 & over
- 2250 m lake swimming
- 96 km road cycling + 1732 ft ascent
- 20 km road running + 351 ft ascent
- Sat 8 Aug 2026
- £130-£150
ATW Odyssey Half Distance Triathlon
Complete your own Odyssey on a journey of self-discovery in the Cambridgeshire countryside featuring a swim in the River Ouse, a scenic ride and a run around the beautiful town of St Neots.
- Enter online
- Undulating
- Age 19 & over
- 1900 m river swimming
- 90 km road cycling + 1686 ft ascent
- 21.1 km road running
- Sat 8 Aug 2026
- £140-£160
ATW First To Full Triathlon Festival | Half Distance Triathlon
Be part of a UK first. This isn’t just another triathlon—it’s the first event of its kind where you decide the distance, from sprint to full, and race your way.
- Enter online
- PB
- Age 19 & over
- 1900 m river swimming
- 90 km road cycling + 1686 ft ascent
- 21.1 km road running + 0 ft ascent