Triathlons in UK in May 2026
Find triathlons in UK in May 2026 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.
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- Sat 2 May
- £58-£120
Dorney Triathlon | May
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 3 May
- £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
- Sun 3 May
- £57-£119
ATW St Neots Triathlon | Race 1
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
- Sat 9 May
- £25-£60
The All Nations Triathlon, 5K, 10K and Half Marathon Run
Delve into an action-packed day of multisport racing, featuring an inclusive Super Sprint Triathlon, 5K, 10K and Half Marathon distances for all abilities at the stunning Olympic venue!
- 5K run
- 10K run
- Half marathon
- Super sprint triathlon
- Sat 9 May
- £250-£270
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
- Sun 10 May
- £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
- Fri 15 - Sun 17 May
- £30
- Early bird
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
- + 14 more races
- Sat 16 May
- £79-£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
- Sun 17 May
- £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
- Sat 23 May
- £130
ATW Box End Mixed Team Relay
Unleash your team’s speed and strategy in an exhilarating mixed relay, racing through swim–bike–run laps at Box End’s stunning, spectator-friendly lakeside venue.
- 350 m lake swimming
- 7.7 km road cycling + 102 ft ascent
- 1 km road running
- Sun 24 May
- £67-£139
ATW Box End Triathlon
Experience a choice of multi-sport events — triathlon, relay triathlon and aquabike — at a stunning watersports venue with pristine water, scenic routes, a custom medal and more.
- Sprint triathlon
- Sprint aquabike
- Olympic triathlon
- Standard aquabike
- Half Ironman
- + 1 more race
- Sun 24 May
- £45
The Dorchester Sprint Triathlon
Bike past historic landmarks, and run beside the Great Feild at Poundbury. As you finish each leg of the course, you’ll get closer to the crowds of people cheering you on at that final stretch.
- 300 m pool swimming
- 21 km road cycling + 792 ft ascent
- 5 km road running + 147 ft ascent
- Wed 27 May
- £58-£78
Midweek Dorney Triathlon | May
Take on this multi-activity 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 3 May
- £20-£99
Horwich Triathlon, Multisport & Trail Runs
- Sprint triathlon
- Olympic triathlon
- Sprint duathlon
- Standard duathlon
- Sprint aquathlon
- + 5 more races