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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Triathlon distances
Find out more about common triathlon event distances below to help find your perfect event!
Triathlons in 2025
Featured events are listed below - select a month/region or the map view to see all events.
- Sat 5 Jul
- £155-£295
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
- Sun 6 Jul
- £58-£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.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Sprint aquabike
- Sun 6 Jul
- £75-£125
- Entries close soon
ATW Bristol Triathlon
ATW presents the Bristol Triathlon, one of the UK's most-popular 'closed-road' triathlon events, in a vibrant city known for its culture, creativity and green spaces.
- Sprint triathlon
- Sprint aquabike
- Olympic triathlon
- Standard aquabike
- Sat 12 - Sun 13 Jul
- £20-£95
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.
- Lake swim 4
- Sprint triathlon
- Sprint aquabike
- Standard aquabike
- Olympic triathlon
- + 5 more races
- Sun 13 Jul
- £58-£120
Dorney Triathlon | July
Take on a multi-activity or distance event and take the opportunity to race around this unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sat 19 - Sun 20 Jul
- £35-£295
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 19 Jul
- £265-£295
Castle To Coast Triathlon
Swim, bike, run your way from Windsor Castle to Brighton on this unique, non-competitive, point-to-point adventure through the North & South Downs. Fully way-marked (no navigation) and full support.
- 1.2 miles lake swimming
- 67 miles road cycling + 3550 ft ascent
- 14 miles trail running + 1512 ft ascent
- Sun 20 Jul
- £55
- Entries close soon
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 + 246 m ascent
- 5 km multi terrain running + 111 m ascent
- Sun 27 Jul
- FREE-£120
Dorney Triathlon | July
Take on a multi-activity or distance event and take the opportunity to race around this unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sat 2 - Sun 3 Aug
- £31.99-£249.99
Craft Snowman Triathlon & Duathlon, Snowman Swim & Ogwen Yr Helgi Du Trail Runs
Awarded the Event of the Year (2021) in the Welsh Triathlon Awards, The Craft Snowman is well known as the toughest multi-terrain triathlon and duathlon in the UK. Plus swims and trail running events.
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Sprint duathlon
- 10K run
- + 5 more races
- Sun 3 Aug
- £45-£80
Bishopton Triathlon
Start your triathlon journey with Bishopton Lake, home of the North East Wake Park. This venue offers a great opportunity for beginners to test their grit...
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sprint aquathlon
- + 1 more race
- Sat 9 Aug
- £40-£120
Dorney Triathlon | August
Take on a multi-activity or distance event and take the opportunity to race around this unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- + 1 more race
- Sun 10 Aug
- £58-£120
ATW St Neots Triathlon | Race 3
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.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Sprint aquabike
- Sun 17 Aug
- £58-£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 17 Aug
- £21-£29
ATW Oundle Children’s Triathlon
ATW is the largest triathlon organiser in the UK and is bringing you the Oundle Childrens Triathlon! Ideal for all levels including very first attempts at triathlon.
- Kids triathlon 5
- Wed 27 Aug
- £58-£78
Midweek Dorney Triathlon | August
Take on a multi-activity or distance event and take the opportunity to race around this unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Sprint aquabike
- Sun 31 Aug
- £68-£250
Roadford Lake Triathlon Autumn
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.
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Ironman
- Sun 31 Aug
- £44-£49
HSV Sprint Triathlon & Aquabike
This is a great race for all standards, from the absolute beginner right through to the seasoned triathlete. The course is fast, flat and has great PB potential.
- Sprint triathlon
- Sprint aquabike
- Sat 6 Sep
- £240-£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.
- 1.5 km lake swimming
- 92 km road cycling
- 18.5 km multi terrain running
- Sun 7 Sep
- £80-£120
Helvellyn Triathlon & Aquabike
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.
- Olympic triathlon
- Standard aquabike
- Sat 13 Sep
- £78-£120
ATW Grafham Triathlon
Sprint or Standard Tri or Aquabike, in and around the beautiful, clean reservoir, on a flat course for all abilities with custom-designed medal, free photos and finish line goodies.
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Sat 13 Sep
- £45-£130
Sundowner Triathlon
Bringing back the Sundowner! An unforgettable triathlon event at Allerthorpe Lakeland Park in Yorkshire is now back on the race calendar and 100% going ahead!
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Standard aquabike
- Middle aquabike
- + 2 more races
- Sun 14 Sep
- £73-£98
Aviemore Triathlon
Escape to the Cairngorms for an adventure triathlon in the scenic waters of Loch Morlich, then mountain biking and trail running in Glenmore Forest. Go Short Fast Durty or Long Hard Durty.
- Sprint triathlon
- Olympic triathlon
- Sun 14 Sep
- £20-£74.50
Woking Autumn Triathlon & Junior Aquathlon
Book Your Spot for the Woking Triathlon! Join one of the most popular triathlons, where athletes return year after year!
- Super sprint triathlon
- Sprint triathlon
- Kids aquathlon 5
- Sprint aquathlon
- Sun 21 Sep
- £45-£56
Dawlish Triathlon
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.
- Super sprint triathlon
- Sprint triathlon
- Sun 21 Sep
- £30-£97
Eton Dorney Triathlon & Swims
The Olympic venue, Eton Dorney, offers pan-flat, traffic-free roads and a beautiful clear lake for all levels of triathletes and swimmers to enjoy in an exclusive setting.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Lake swim 4
- Sun 21 Sep
- £78-£180
ATW Big East & Maldon 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.
- Sprint triathlon
- Olympic triathlon
- Standard aquabike
- Half Ironman
- Middle aquabike
- Sat 27 - Sun 28 Sep
- £35-£295
Hever Castle Triathlon and Multisport Festival
Get active in the award-winning grounds and surrounding Kent countryside in the discipline of your choice! Recruit your friends and celebrate completing your challenge in the festival village.
- Half Ironman
- Olympic triathlon
- Sprint triathlon 2
- Super sprint triathlon
- Novice triathlon
- + 17 more races
- Sat 27 - Sun 28 Sep
- £73-£98
Craggy Island Triathlon
An award-winning triathlon on the incredible, unspoilt Hebridean Island of Kerrera, off Scotland's stunning west coast with the accessible marina and its facilities as the main hub.
- Sprint triathlon 2
- Sat 27 Sep
- £58-£120
Dorney Triathlon | September
Take on a multi-activity or distance event and take the opportunity to race around this unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Standard aquabike
- Sun 28 Sep
- £65
Salcombe Brewery Co Sprint Triathlon
Taking place from the wonderful North Sands, put your endurance to the test with a sociable and challenging seaside triathlon, to finish with a Salcombe Sprint Triathlon medal!
- 700 m sea swimming
- 19 km road cycling + 400 m ascent
- 3 km trail running + 90 m ascent
- Sat 4 Oct
- £240-£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!
- 1.5 km lake swimming
- 53 km mountain biking
- 18.5 km multi terrain running
- Sun 5 Oct
- £22-£51
Torbay Triathlon Autumn
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.
- Sprint triathlon
- Super sprint triathlon
- Kids triathlon 7
- Novice triathlon
- Sun 12 Oct
- £55
Minehead Triathlon
An award-winning coastal triathlon set among the safety of the sandy bay, featuring a fast bike route with Exmoor as the backdrop and a promenade run with beach finale!
- 750 m sea swimming
- 20 km road cycling
- 5 km multi terrain running
- Mon 4 May 2026
- £20-£63
Tavistock Triathlon
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!
- Olympic triathlon
- Sprint triathlon
- Super sprint triathlon
- Kids triathlon 5
- Sat 9 May 2026
- £195-£225
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.
- 1.5 km sea swimming
- 100 km road cycling
- 13 km multi terrain running + 3330 ft ascent
- Fri 15 - Sun 17 May 2026
- £30
Keswick Mountain Festival
The UK's top outdoor sports festival! Incredible entertainment, sports events, speakers, live music, activities, brand expo, bars, food, drink and much more.
- 5K run 2
- 10K run
- Half marathon
- 50K ultra run
- Fell run
- + 12 more races
- Sun 17 May 2026
- £68-£135
Roadford Lake Triathlon
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.
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Sun 24 May 2026
- £63-£135
ATW Box End Triathlon
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.
- Sprint triathlon
- Sprint aquabike
- Olympic triathlon
- Standard aquabike
- Half Ironman
- + 1 more race
- Sun 7 Jun 2026
- £135-£175
ATW Grafman Middle Distance Triathlon & Aquabike
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.
- Half Ironman
- Middle aquabike
- Sun 7 Jun 2026
- £2.50-£30
Pendle Pool Triathlon powered by Fort Vale
Come join the Pendle Triathlon for this annual event! Set at West Craven Sports Centre in the beautiful Lancashire countryside.
- Super sprint triathlon
- Sprint triathlon
- Super sprint duathlon
- Sprint duathlon
- Super sprint aquabike
- + 3 more races
- Sun 6 Jul
- £70-£129
Croyde Ocean Triathlon
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.
- Sprint triathlon
- Olympic triathlon
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.