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 9 May
- £30-£70
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
- £225-£650
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
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-£185
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
- £67-£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
- FREE-£63
Cotswolds Lake 62 Spring Events
Swim in a private Cotswolds lake, ride scenic country roads and run within an exclusive venue at this family-friendly multisport spring event.
- Sprint triathlon
- Sprint duathlon
- Sprint aquabike
- Sprint aquathlon
- Fun run
- + 1 more race
- Sat 23 - Sun 24 May
- £10-£55
Skipton Multisport Festival
Swim, bike and run in the Gateway to the Dales at this family-friendly multisport festival, featuring triathlon, trail running and scenic sportives over May Bank Holiday.
- Fun run 4
- Trail run
- Short sportive
- Long sportive
- Sportive
- + 7 more races
- Sat 23 May
- £140
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
- £69-£145
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
- Sat 9 - Sun 10 May
- £20-£40
Galashiels Triathlon
- Novice triathlon
- Kids triathlon 5
- Sprint triathlon
- Sprint aquabike
- Sprint aquathlon
- Sat 16 May
- £38-£67
Essex Triathlons - Hanningfield Reservoir
- Sprint triathlon
- Olympic triathlon
- Lake swim 2
- Sprint aquabike
- Standard aquabike
- Sun 17 May
- £70-£125
51fiver Cotswold Standard Triathlon
- Olympic triathlon
- Standard aquabike
- Sun 24 May
- £30-£100
Bewl Water Triathlon
- Sprint triathlon 2
- Olympic triathlon 2
- Super sprint triathlon
- Sprint aquabike
- Standard aquabike
- Sun 24 May
- £84.99-£100
Swansea Triathlon
- 750 m dock swimming
- 20 km road cycling
- 5 km road running
- Mon 25 May
- £60-£85
Westonbirt Sprint Triathlon
- 400 m pool swimming
- 23 km road cycling
- 5 km road running
- Sat 30 - Sun 31 May
- £35-£95
Northumberland Festival of Sport
- Lake swim 3
- Kids triathlon 4
- Sprint triathlon
- Olympic triathlon
- Sprint aquabike
- Sun 31 May
- £45-£58
Uppingham Pool Triathlon
- Sprint triathlon
- Sprint aquabike
- Sprint aquathlon