Half Ironman (middle distance) in UK

• 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 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

• 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 14 Jun 2026
• £155-£195

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 14 Jun 2026
• £130

Plymouth Middle Distance Triathlon

Dive into the Plymouth Middle Distance Triathlon! A stunning sea swim, scenic coastal bike ride, and flat waterfront run offering an unforgettable multisport challenge for athletes of all abilities.

• Chip timing
• Enter online
• Age 18 & over

• 1900 m sea swimming
• 90 km road cycling + 4545 ft ascent
• 20 km trail running + 1620 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 5 Jul 2026
• £140-£160

ATW Odyssey At Box End Triathlon | Half Distance Triathlon

Get ready for one of the UK’s most exciting Half Iron triathlons of the year! Dive into crystal-clear lake waters, then ride a smooth, rolling bike course and follow scenic on-site run paths.

• Enter online
• Undulating
• PB
• Age 19 & over

• 2250 m lake swimming
• 96 km road cycling + 1732 ft ascent
• 20 km road running + 351 ft ascent

• Sat 18 Jul 2026
• £265-£293
• Early bird

Castle To Coast Triathlon

A one-of-a-kind triathlon adventure from castle to coast – swim, bike, run and soak up the best of the North and South Downs, fully supported all the way, no navigation needed!

Early bird on now

• Newcomers
• Chip timing
• Enter online
• Event village
• Rural
• Age 18 & over

• 1.2 miles lake swimming
• 66 miles road cycling + 3550 ft ascent
• 14 miles trail running + 1512 ft ascent

• 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
• £145-£165

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.

• Chip timing
• Enter online
• Undulating
• Age 19 & over

• 1900 m river swimming
• 90 km road cycling + 1680 ft ascent
• 21.1 km road running + 0 ft ascent

• Sat 8 Aug 2026
• £145-£165

ATW First To Full Triathlon Festival | Half Distance Triathlon

Be part of a UK first. This isn’t just a Half Iron triathlon - it’s the first event of its kind where you decide the distance, from sprint to full, and race your way.

• Chip timing
• 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

• Sat 22 Aug 2026
• £250

THE RESTLESS Gravel XTRI

Take on a wild Scottish adventure combining a cold-water loch swim, epic gravel ride and tough mountain run through the breathtaking landscape of the Arrochar Alps.

• Chip timing
• Enter online
• GPS tracking
• Hilly
• Mountainous
• Traffic free
• Event village
• Event expo
• Rural
• Mountains
• Age 18-100

• 1.8 km lake swimming
• 50 km gravel riding + 2000 m ascent
• 25 km fell running + 1200 m ascent

• Sun 30 Aug 2026
• £130

Wimbleball Middle Distance Triathlon

A superb triathlon venue which hosted Ironman 70.3 for ten years! Experience dramatic hills, pristine open water and wild Exmoor scenery in a tough, rewarding Middle Distance Triathlon.

• Chip timing
• Enter online
• Age 18 & over

• 1900 m lake swimming
• 92 km road cycling + 5381 ft ascent
• 21 km road running + 1508 ft ascent

• Sat 5 Sep 2026
• £215-£260

THE ROC ENGLAND

Face up to the mountain in one of Europe's most inspiring locations. From Windermere to Coniston to summit England's highest mountain, if you love a tough and rewarding challenge - you'll thrive.

• Recycling
• Plastic bottle free
• Music
• Chip timing
• Enter online
• Mountainous
• Event village
• Rural
• Mountains
• Sustainability policy
• Plastic-free event
• Age 18 & over

• 1.5 km lake swimming
• 92 km road cycling
• 18.5 km multi terrain running

• Sat 3 Oct 2026
• £215-£260

THE ROC SCOTLAND

THE ROC takes in the Highlands. Kinlochleven to the summit of Ben Nevis and back, including a Loch swim, stunning mountain/gravel bike sections and the UK's highest mountain!

• Recycling
• Plastic bottle free
• Music
• Chip timing
• Enter online
• Hilly
• Mountainous
• Event village
• Rural
• Mountains
• Sustainability policy
• Plastic-free event
• Age 18 & over

• 1 km lake swimming
• 52 km mountain biking
• 18 km multi terrain running