- Sun 26 May
- £20-£30
- Sun 26 May
- £20-£30
The One on the River | Marlow | May
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.
- Newcomers
- Event village
- Park
- Sustainability policy
- Age 17 & over
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Super sprint duathlon
- Sprint duathlon
- + 10 more races
- Sun 16 Jun
- £25-£40
- Sun 16 Jun
- £25-£40
The One for the Planet powered by Climategames
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.
- Families
- Wheelchair users
- Newcomers
- Event village
- Sustainability policy
- Age 17 & over
- Super sprint triathlon
- Sprint triathlon
- Olympic triathlon
- Super sprint duathlon
- Sprint duathlon
- + 13 more races
- Fri 21 - Sun 23 Jun
- £8-£125
- Fri 21 - Sun 23 Jun
- £8-£125
ATW Chiltern Endurance Weekend
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!
- Families
- Recycling
- Newcomers
- Event village
- Rural
- Sustainability policy
- All ages
- Lake swim 6
- Ironman
- Half Ironman
- Long sportive 2
- Medium sportive 2
- + 7 more races
- Sun 14 Jul
- £25-£40
- Sun 14 Jul
- £25-£40
The One on the River | Marlow | Jul
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.
- Newcomers
- Event village
- Park
- Sustainability policy
- Age 17 & over
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Sprint duathlon
- Standard duathlon
- + 10 more races
- Sun 22 Sep
- £25-£40
- Sun 22 Sep
- £25-£40
The One on the River | Henley
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.
- Newcomers
- Event village
- Park
- Sustainability policy
- Age 17 & over
- Sprint triathlon
- Olympic triathlon
- Half Ironman
- Sprint aquabike
- Standard aquabike
- + 4 more races
- Sat 28 - Sun 29 Sep
- £36-£65
- Sat 28 - Sun 29 Sep
- £36-£65
Hever Castle Triathlon and Multisport Festival
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.
- Families
- Recycling
- Newcomers
- Event village
- Park
- Rural
- Sustainability policy
- Age 13 & over
- Half Ironman
- Olympic triathlon
- Sprint triathlon 2
- Super sprint triathlon
- Novice triathlon
- + 16 more races
- Wed 5 Jun
Swim the Lake Festival (A)
- Lake swim 3
- Sprint aquathlon
- 5K run
- Fri 28 Jun
JLL Property Triathlon
- Sprint triathlon
- Sprint duathlon
- Lake swim
- 5K run
- Sat 13 - Sun 14 Jul
Outdoor Swimmer Henley Swim Festival
- River swim 5
- Wed 17 Jul
Swim the Lake Festival (B)
- Lake swim 3
- Sprint aquathlon
- 5K run