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.
Find out more about common triathlon event distances below to help find your perfect event!
Featured events are listed below - select your region to see all events.
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.
The UK's Number 1 Mountain Festival! Sport, Speakers, Live Music, Activities, Good Times. A full multi-sport and entertainment festival with exciting new changes for 2024!
This popular weekend of multisport welcomes everyone to a wide range of activities, lively event village, grandstand seating, relay options, youth events plus some exciting new additions!
A choice of multi-sports events including triathlon, relay triathlon and aquabike at a stunning watersports venue with immaculate water quality, scenic routes, a custom designed medal and much more.
Triathlon and swim events at Roadford Lake, offering a range of distances to suit all ability levels in a safe environment, with camping options to enjoy the area after your event.
Race through the beautiful grounds and surrounding area of stunning South Galway on an event of your choice from starter to elite then celebrate with friends and family in the festival village.
Taking place across the scenic Thames Valley area. Swim the river, cycle the hilly open roads, or run the flat Thames path – with a selection of activities over grass, tarmac, and trail.
One of the country’s most popular middle distance swim-bike-run events, delivered by triathletes for triathletes, at the beautiful and iconic Grafham Water.
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.
Race through the Grand Canal and the historic forest and town of Chantilly on an event of your choice from starter to elite then celebrate with friends and family in the festival village.
The successful Dartmouth Triathlon returns for its 9th year! Sea swim, stunning coastal bike route, out and back run including Devon's flattest road, plus chance to camp on the beach!
Set at the spectacular, flat, and smooth-surfaced Dorney Lake near Windsor, this multi-sport event is for the ones that enjoy being by the water and offers a selection of activities for all levels.
Located at the Stewartby Sailing Club this venue is perfect for triathlon and aquabike and was host to a sold-out GB team qualifier event in 2023, with probably the fastest bike leg in the country!
Join this exhilarating Endurance Weekend in the stunning Chiltern Hills! Whether you seek a weekend of endurance, picturesque sights or a chance to bond with fellow athletes, this is your opportunity!
Race through the beautiful grounds of the Cholmondeley Castle estate on an event of your choice from starter to elite then celebrate with friends and family in the festival village.
Start with a great sea swim in warm waters then on to the bikes for a closed road and flat bike leg. Finally there's a run with views of the sea. What a venue!
This is the ultimate triathlon. Individuals and teams will conquer the beautiful waters, forests and terrain that give Northumberland and Kielder its unique character.
A superb summer's day of running and triathlon at the stunning Olympic venue which boasts fast, flat courses with closed roads and ideal swimming conditions. A must for your schedule this year.
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 marathon around the beautiful town of St Neots.
Stunning riverside venue! Swim in the beautiful River Ouse, cycle through scenic villages and run around Riverside Park in a triathlon, duathlon or aquabike event of your choice.
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 and children's races too!
Taking place across the scenic Thames Valley area. Swim the river, cycle the hilly open roads, or run the flat Thames path – with a selection of activities over grass, tarmac, and trail.
A fabulous challenging day of triathlon at an accessible location with a range of waves and maximum support for inclusivity all-round, whether complete beginner or seasoned Sprint professional.
Top 21 must-do triathlon challenges! Based at the beautiful, award-winning Putsborough Sands and sold out again last year, this triathlon takes in some of the South West’s most stunning scenery.
Race through the beautiful grounds and surrounding area of stunning Leicestershire on an event of your choice from starter to elite then celebrate with friends and family in the festival village.
A choice of multi-sports events including triathlon, relay triathlon, aquabike, aquathlon and duathlon in magnificent grounds including manicured sports fields, lakes, wildlife and greenery.
A renowned, challenging and unique event where the toughness of the course is only matched by the stunning scenery of the Lake District National Park. Not just another race but highly demanding.
Taking THE ROC into the Lake District, this is an opportunity to test your resolve and focus in one of the most inspiring locations in Europe. Face up to the mountain.
Triathlons at Dawlish Warren, a safe and supported environment for sea swimming, with a range of triathlon distances to offer a great challenge in a scenic location.
Taking place across the scenic Thames Valley area with routes going through Culden Faw Estate. Swim the river, cycle the hilly open roads, run through the trail paths enjoying great views.
Race through the beautiful grounds and surrounding area of Hever Castle on an event of your choice from starter to elite then celebrate with friends and family in the festival village.
Scotland, you are immense. ROC Scotland athletes, you are legends! THE ROC takes on the Highlands, from Kinlochleven to the summit of Ben Nevis, the UK’s highest mountain and back.
A totally traffic free festival of triathlon offering both junior and senior distance options on the English Riviera. Pool swimming along with tarmac cycling and a parkland run, with a great medal.
The flat terrain of the Torbay Velodrome offers a range of Duathlon distances, catering to all ages and abilities in a safe, supported and inclusive manner, with a medal and donut at the finish line!
An Olympic format mixed Team Relay Triathlon using the fantastic facilities at Torbay Velopark, professionally chip timed over a traffic-free course, BTF affiliated with a great finishers medal.
A totally traffic free festival of triathlon offering junior, senior and relay options on the English Riviera. Pool swimming along with tarmac cycling and a parkland run, with a great medal.
Tavistock Triathlon is for all ages and abilities using the amazing Olympic legacy 50m pool at Mount Kelly with quiet rolling roads for the bike and the disused railway line for the run. What a venue!
Guides, tips and advice on triathlon events.
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.
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.
Select your location for triathlons in your area.