Half Ironman (middle distance) in UK
Find half ironman (middle distance) in UK 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 9 May 2026
- £195-£225
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
- 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
- £120-£135
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
- 81 km road cycling + 1674 ft ascent
- 20 km trail running + 340 ft ascent
- Sun 7 Jun 2026
- £155-£175
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 14 Jun 2026
- £135
Weymouth WMD Triathlon | Weymouth Middle Distance Triathlon
The Middle Distance Triathlon will not fail to impress. With stunning views of Weymouth nature reserve and a true test of stamina, you'll be beaming with pride at the finish line.
- Chip timing
- Enter online
- Undulating
- Age 18 & over
- 1900 m sea swimming
- 90 km road cycling + 2501 ft ascent
- 21 km multi terrain running + 259 ft ascent
- Sun 21 Jun 2026
- £196-£245
Cholmondeley Castle | Gauntlet Triathlon
Get active in the beautiful grounds and surrounding area of stunning Cheshire in the epic Gauntlet! Bring your friends and celebrate completing your challenge in the festival village.
- Chip timing
- Enter online
- Age 18 & over
- 1.9 km lake swimming
- 84 km road cycling
- 21 km road running
- Sun 19 Jul 2026
- £196-£245
Belvoir Castle | Gauntlet Triathlon
A jewel in the castle crown! Get active in the beautiful grounds and surrounding area of stunning Leicestershire in the epic Gauntlet Triathlon! Celebrate in the festival village afterwards.
- Chip timing
- Enter online
- Age 18 & over
- 1.9 km lake swimming
- 90 km road cycling + 957 ft ascent
- 21 km road running
- 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
- Sun 19 Jul 2026
On The Edge Middle Distance Triathlon
- 1.9 miles lake swimming
- 56 miles road cycling
- 13.1 miles trail running
- Sun 30 Aug 2026
Wimbleball Triathlon | Middle Distance Triathlon
- 1900 m lake swimming
- 92 km road cycling + 5381 ft ascent
- 21 km road running + 1508 ft ascent