Triathlons in the UK
Triathlon events combine swimming, cycling and running in that order with a huge range of events with total distances from under 15 km to over 300 miles! Select your location to find triathlons in your area, read more about the distances below or scroll down for the UK's biggest events.
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Map viewTriathlon distances
Find out more about common triathlon event distances below to help find your perfect event!
Triathlons in 2026-2027
Featured events are listed below - select a month/region or the map view to see all events.
- Sat 11 - Sun 12 Jul
- £21-£100
Ripon Triathlon Festival
A family-friendly event in partnership with the Brownlee Foundation, for triathletes of all levels including a Sprint, Standard (Olympic), Middle distance tri, Swims, Aquabike, Relay and Juniors.
- Lake swim 2
- Sprint triathlon
- Sprint aquabike
- Standard aquabike
- Olympic triathlon
- + 5 more races
- Sun 12 Jul
- £75-£130
ATW Bristol 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' triathlons.
- Sprint triathlon
- Sprint aquabike
- Olympic triathlon
- Standard aquabike
- 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
- Sat 18 - Sun 19 Jul
- £35-£245
Belvoir Castle Triathlon and Multisport Festival
A jewel in the castle crown! Get active in the beautiful grounds and surrounding area of stunning Leicestershire in the discipline of your choice! Celebrate in the festival village afterwards.
- Kids triathlon 4
- Super sprint triathlon
- Sprint triathlon 2
- Olympic triathlon
- Half Ironman
- + 14 more races
- Sat 18 Jul
- £270-£295
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!
- 1.2 miles lake swimming
- 66 miles road cycling + 3550 ft ascent
- 14 miles trail running + 1512 ft ascent
- Sun 19 Jul
- £38-£89.25
Eton Dorney Family Triathlon
Eton Dorney Family Triathlon sees the return of junior racing to Dorney Lake alongside the one and only sprint triathlon event at the venue.
- Novice triathlon
- Kids triathlon 5
- Super sprint triathlon
- Sprint triathlon
- Sun 19 Jul
- £55
Clevedon Triathlon
An amazing celebration weekend of swim-bike-run using the magnificent Marine Lake with the glorious Victorian Clevedon Pier as the backdrop, sea views, promenade and top reviews!
- 750 m lake swimming
- 20 km road cycling
- 5 km multi terrain running
- 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
- £42.99-£259.99
Snowman Triathlon, Duathlon and Swims
Awarded the Event of the Year (2021) in the Welsh Triathlon Awards, The Snowman is well known as the toughest multi-terrain triathlon and duathlon in the UK. Not for the faint-hearted.
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Sprint duathlon
- Lake swim 2
- Sat 1 Aug
- £60-£90
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.
- Super sprint triathlon
- Sprint triathlon
- Sat 8 Aug
- £165-£350
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.
- Ironman
- Half Ironman
- Sat 8 Aug
- £69-£120
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.
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Sprint aquabike
- 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-£350
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
- Sun 16 Aug
- £59-£99
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.
- Super sprint triathlon
- Sprint triathlon
- Sprint aquabike
- Sun 16 Aug
- £32-£39
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.
- Kids triathlon 5
- Sat 22 Aug
- £250
THE RESTLESS Xtreme Gravel Triathlon
A wild Scottish adventure combining a cold-water loch swim, xtreme gravel ride and brutal mountain run through the haunted drover's roads of the Arrochar Alps.
- 1.8 km lake swimming
- 50 km gravel riding + 2000 m ascent
- 25 km fell running + 1200 m ascent
- Sun 23 Aug
- £52.50-£80
Bishopton Triathlon
Swim a sheltered, shallow open-water lake, race a fast cycle course (used in the British Championship), then finish on a spectator-friendly trail run, all in one brilliant day.
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sprint aquathlon
- + 1 more race
- Wed 26 Aug
- £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.
- Super sprint triathlon
- Sprint triathlon
- Sprint aquabike
- Sun 30 Aug
- £69-£260
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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.
- Olympic triathlon
- Half Ironman
- Ironman
- Standard aquabike
- Standard aquathlon
- Sat 5 Sept
- FREE-£80
Cotswolds Lake 62 End of Season Events
Swim in a private Cotswolds lake, ride scenic country roads and run within an exclusive venue at this family-friendly multisport end-of-season event.
- Olympic triathlon
- Standard duathlon
- Standard aquabike
- Standard aquathlon
- Fun run
- + 1 more race
- Sat 5 Sept
- £250-£260
THE ROC ENGLAND
Face up to the mountain. A spectacular 112km swim, bike and mountain challenge from the shores of Windermere to the summit of Scafell, England's highest peak, via the dramatic Mickleden Valley.
- 1.5 km lake swimming
- 92 km road cycling
- 18.5 km multi terrain running
- Sun 6 Sept
- £80-£120
Helvellyn Triathlon & Aquabike
Take on one of the UK’s toughest triathlons – a legendary Lake District challenge where brutal climbs, wild beauty and sheer determination define every mile.
- Olympic triathlon
- Standard aquabike
- Sun 6 Sept
- £98.99-£259.99
Triathlon Y Bala
Start with a water swim in beautiful Llyn Tegid against a mountain backdrop, then push through scenic bike and run routes on fully closed roads around Bala, North Wales.
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Sat 12 Sept
- £55-£150
Sundowner Triathlon
The Sundowner is back! Race as the sun sets in an unforgettable triathlon event at Allerthorpe Lakeland Park in Yorkshire which is now back on the race calendar.
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Standard aquabike
- Middle aquabike
- + 2 more races
Triathlon guides
Guides, tips and advice on triathlon events.
- 10 mins read
The best triathlons in the UK
From beginner races to ultra challenges, swim-bike-runs are the UK's favourite multi-sport events - these are the triathlons that you need to have on your radar.
- 15 mins read
7 things we learned from a half Ironman
Humbling and exhilarating in equal measures, a half Ironman triathlon is an unforgettable experience - following these hard-learned tips will make sure that's for all the right reasons.
- 10 mins read
Enter your first triathlon
This dynamic multi-sport will test your speed and stamina, providing an incredible experience along the way! We've got everything you need for your first swim-bike-run right here.
Triathlons near you
Select your location for triathlons in your area.