Dorney Lake Triathlon
Always double-check with the organizer's website! This page may contain affiliate links.
Dorney Lake Triathlon : 26 September 2026
The Dorney Lake Triathlon takes place at Dorney Lake, Windsor, United Kingdom, and supports Macmillan Cancer Support. The organiser lists RunThrough as the event partner and notes Macmillan as a triathlon partner for 2026.
The event offers multiple race formats and alternatives:
- Super Sprint: 400m swim, 9.5km bike (2 laps), 2.5km run
- Sprint: 750m swim, 19km bike (4 laps), 5km run
- Standard: 1500m swim, 38km bike (8 laps), 10km run
There is an Aquabike option for swim and bike only, and relay entries that allow two or three people to share the disciplines. The swim uses the purpose built lake and the bike and run courses are on road across largely flat grounds. Elevation is listed per distance and courses are marked with distance flags.
Entries include a themed medal, free race photos, chip timed results, and post race goodies. The event provides marshals to guide participants, a serviced event village with food and drink options, and freebies from partners at the finish. The organiser states a focus on sustainability. RunThrough memberships can be used for entry but member bibs and a member desk will not be available at this event, and no additional places will be offered after the event sells out. Visit the organization's website for the most recent information.
