Half Ironman (middle distance) in East of England
Find half ironman (middle distance) near me in East of England for 2025/2026 - 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.

- Sun 18 May
- £120-£140
- Sun 18 May
- £120-£140
ATW Box End Centurion 100km Triathlon
Challenge yourself to tackle a 100km Centurion this year, a distance made popular by the PTO race series. Ideal if you're training for a 70.3 Half-Iron or taking a step up from Standard Distance Tri.
- Enter online
- Undulating
- Age 18 & over
- 2250 m lake swimming
- 80 km road cycling
- 20 km trail running

- Sun 1 Jun
- £165-£186
- Sun 1 Jun
- £165-£186
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 + 1844 ft ascent
- 21 km multi terrain running + 253 ft ascent

- Sat 5 Jul
- £155-£175
- Sat 5 Jul
- £155-£175
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 18 & over
- 1900 m river swimming
- 90 km road cycling
- 21.1 km road running

- Sun 21 Sep
- £155-£175
- Sun 21 Sep
- £155-£175
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 6 Jul
Outlaw Half Holkham Weekend | Outlaw Half Holkham
- 1.2 miles lake swimming
- 56 miles road cycling
- 13.1 miles road running