Relay triathlons in UK in Summer

• Sat 6 Jun
• £58-£120

Dorney Triathlon | June

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.

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

• Sun 7 Jun
• £166-£187

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.

• 1900 m lake swimming
• 90 km road cycling + 1680 ft ascent
• 21 km multi terrain running

• Sun 7 Jun
• £70-£90

Dartmouth Triathlon | Sprint

Swim in the clear waters of Blackpool Sands, then take a scenic coastal bike route featuring Devon's flattest road, then run by a stream. Plus chance to camp on the beach!

• 750 m sea swimming
• 20 km road cycling + 1067 ft ascent
• 5 km road running + 228 ft ascent

• Sun 14 Jun
• £80-£195

Weymouth WMD Triathlon

Whichever distance you choose, this 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.

• Half Ironman
• Olympic triathlon
• Sprint triathlon

• Sun 14 Jun
• £85.99-£449.99

Slateman Triathlon & Duathlon

The most iconic multi-sport adventure race in Wales, combining a lake swim, brutal mountain climbs and a demanding run through Snowdonia’s dramatic, awe-inspiring landscape.

• Sprint triathlon
• Olympic triathlon
• Half Ironman
• Ironman
• Standard duathlon 2

• Sun 21 Jun
• £66-£119

ATW Stewartby Lake Triathlon & Aquabike

Dive into the ATW Stewartby Lake Triathlon and Aquabike – a flat, fast and friendly race offering stunning lake views, smooth roads, and surefire PB potential.

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

• Sun 21 Jun
• £75-£110

Southend Triathlon

Take on an exciting coastal triathlon in Southend, featuring a sea swim, fast seafront cycle, and scenic run with fantastic crowd support all the way.

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

• Sun 28 Jun
• £94.99-£141.99

Wild Horse Brewing Co. Llandudno Triathlon & Duathlon

Race the North Wales coast in a spectacular multi-sport challenge, combining sea air, closed roads and iconic scenery in a fast, friendly triathlon and duathlon setting.

• Sprint triathlon
• Olympic triathlon
• Standard duathlon

• Sun 28 Jun
• £79-£99

ATW Sprint Triathlon | Mallory Park

Mallory Park Triathlon Extravaganza: A Traffic-Free Triumph! A thrilling and safe circuit nestled in picturesque surroundings, boasting its own self-enclosed swim lake for a Sprint Tri.

• 750 m lake swimming
• 20 km road cycling + 790 ft ascent
• 5 km road running + 80 ft ascent

• Sun 5 Jul
• £69-£175

ATW Odyssey At Box End Triathlon

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

• Sprint triathlon
• Olympic triathlon
• Half Ironman
• Sprint aquabike
• Standard aquabike
• + 1 more race

• Sun 5 Jul
• £70-£74

English Riviera Triathlon | Sprint Triathlon

A fast, exciting, spectator-friendly, draft-legal Sprint Triathlon in Torquay! Swim from the sheltered Torre Abbey Sands beach, ride a fast and flattish closed-road circuit and run by the sea.

• 750 m sea swimming
• 20 km road cycling + 656 ft ascent
• 5 km road running + 135 ft ascent

• Sat 11 - Sun 12 Jul
• £20-£100

Ripon Triathlon Festival

A family-friendly event in partnership with the Brownlee Foundation, for triathletes of all skill levels including a Sprint, Standard, Middle distance tri, Swims, Aquabike, Relay and Juniors.

• Sprint triathlon
• Sprint aquabike
• Lake swim 4
• Standard aquabike
• Olympic triathlon
• + 3 more races

• Sun 12 Jul
• £58-£120

Dorney Triathlon | July

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.

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

• Sun 12 Jul
• £95-£115

ATW Bristol Standard Triathlon

Swim, bike, and run through an iconic city backdrop with a flat, fast course and incredible atmosphere — one of the UK's most-popular 'closed-road' Standard triathlons.

• 1500 m lake swimming
• 42 km road cycling + 144 ft ascent
• 10 km road running + 174 ft ascent

• Sat 18 Jul
• £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

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

• Sun 26 Jul
• £58-£120

Dorney Triathlon | July

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.

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

• Sun 26 Jul
• £115.99-£141.99

Snowman Standard Triathlon

A legendary mountain triathlon in Snowdonia: cold-water swim, brutal climbs, tough trail run and iconic views — a true test for determined, adventure-hungry athletes.

• 1500 m lake swimming
• 69.3 km road cycling + 3753 ft ascent
• 8.7 km multi terrain running + 2276 ft ascent

• Sat 8 Aug
• £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

• Ironman
• Half Ironman

• Sat 8 Aug
• £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.

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

• Sat 8 Aug
• £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.

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

• Sat 8 Aug
• £98-£119

ATW St Neots Standard Triathlon | Race 2

Stunning riverside venue! Swim in the beautiful River Ouse, cycle through scenic villages and run around Riverside Park in a Standard Triathlon.

• 1500 m river swimming
• 45 km road cycling + 712 ft ascent
• 10 km road running

• Sun 16 Aug
• £76-£97

ATW Oundle Sprint Distance Triathlon

The UK's largest triathlon organiser brings you the Oundle Sprint Triathlon! It doesn’t matter if you are an experienced triathlete or this is your very first attempt at swim-bike-run.

• 600 m pool swimming
• 25 km road cycling + 561 ft ascent
• 5 km trail running + 30 ft ascent