Triathlons in UK in August 2026

• Sat 1 Aug 2026
• £60-£85

ATW Mallory Park Triathlon - Incorporating the 2027 European Age Group Championship Sprint Triathlon Qualifier

Mallory Park delivers a fast, unforgettable triathlon experience with smooth tarmac, a traffic-free circuit and a clean enclosed lake — an exhilarating, athlete-friendly venue.

• Newcomers
• Event village
• Age 15 & over

• Super sprint triathlon
• Sprint triathlon

• Sat 8 Aug 2026
• £145-£285
• Early bird

ATW Odyssey 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.

Early bird on now

• Families
• Recycling
• Entertainment
• Music
• Event village
• Park
• Rural
• Sustainability policy
• Age 19 & over

• Ironman
• Half Ironman

• Sat 8 Aug 2026
• £65-£117

ATW St Neots Triathlon | Race 2

Stunning riverside venue! Swim in the beautiful River Ouse, cycle through scenic villages and run around Riverside Park in a triathlon or aquabike event of your choice.

• Newcomers
• Event village
• Park
• Sustainability policy
• Age 15 & over

• Sprint triathlon
• Olympic triathlon
• Standard aquabike
• Sprint aquabike

• Sat 8 Aug 2026
• £58-£120

Dorney Triathlon | August

Take on this multi-activity event as an individual or as a relay, and enjoy the opportunity to race around the unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.

• Recycling
• Newcomers
• Event village
• Sustainability policy
• Public transport links
• Age 15 & over

• Super sprint triathlon
• Sprint triathlon
• Olympic triathlon
• Sprint aquabike
• Standard aquabike

• Sat 8 Aug 2026
• £56-£285

ATW First To Full Triathlon Festival

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.

• Newcomers
• Entertainment
• Event village
• Park
• Age 15 & over

• Sprint triathlon
• Olympic triathlon
• Half Ironman
• Ironman
• Sprint aquabike
• + 4 more races

• Sun 16 Aug 2026
• £56-£97

ATW Oundle Triathlon

ATW is the largest triathlon organiser in the UK and is bringing you the Oundle Triathlon! It doesn’t matter if you are an experienced triathlete or this is your very first attempt at swim-bike-run.

• Newcomers
• Event village
• Age 15 & over

• Super sprint triathlon
• Sprint triathlon
• Sprint aquabike

• Sun 16 Aug 2026
• £22-£31

ATW Oundle Children’s Triathlon

A fun, friendly and fully supported triathlon for children of all abilities — perfect for first-timers looking to experience the thrill of swim, bike and run in Oundle.

• Families
• Newcomers
• Event village
• Age 8-16

• Kids triathlon 5

• 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

• Wed 26 Aug 2026
• £58-£78

Midweek Dorney Triathlon | August

Take on this multi-activity event as an individual or as a relay, and enjoy the opportunity to race around the unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.

• Recycling
• Newcomers
• Event village
• Sustainability policy
• Age 15 & over

• Super sprint triathlon
• Sprint triathlon
• Sprint aquabike

• Sun 30 Aug 2026
• £69-£220

Wimbleball 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 multisport challenge of your choice.

• Newcomers
• Event village
• Rural
• Age 17 & over

• Olympic triathlon
• Half Ironman
• Ironman
• Standard aquabike
• Standard aquathlon