Half Ironman (middle distance) in UK in May 2026
Find half ironman (middle distance) in UK in May 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 9 May 2026
- £250-£270
THE ROC WALES
The totally unique ROC format, from Abersoch Bay to the top of Wales’ highest mountain and back. Swim, Bike, Mountain, Bike, Run; THE ROC WALES is triathlon - tough and redefined.
- Recycling
- Plastic bottle free
- Entertainment
- Music
- Chip timing
- Enter online
- Hilly
- Mountainous
- Event village
- Event expo
- Coast
- Mountains
- Sustainability policy
- Plastic-free event
- Age 18 & over
- 1.5 km sea swimming
- 100 km road cycling
- 13 km multi terrain running + 3330 ft ascent
- Sat 16 - Sun 17 May 2026
- £165-£170
Keswick Mountain Festival | Keswick Conqueror
A lake swim, a trail run and a road ride over the course of the festival weekend. Conquer a triathlon challenge over two days. Includes Full Weekend Festival Ticket in the price!
- Newcomers
- Music
- Chip timing
- Enter online
- Mountainous
- Event village
- Age 18 & over
- 3.6 km lake swimming
- 100 km road cycling + 1625 m ascent
- 25 km trail running + 866 m ascent
- 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 17 May 2026
- £135
Roadford Lake Triathlon | Middle Distance
This triathlon returns for another successful year! It’s a superb swimming venue with quiet rolling roads for the bike course and a cracking run too. Plus there's lakeside camping available too.
- Chip timing
- Enter online
- Undulating
- Age 18 & over
- 1.9 m lake swimming
- 93 km road cycling + 8490 ft ascent
- 20 km road running + 3288 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