Take on a Sprint or Standard distance triathlon and take the opportunity to race around this unique and inspiring Olympic venue!!

This event is draft illegal.

Clear water and flat, scenic grounds lend themselves to a fast swim, bike and run course, the ideal venue for a chip timed personal best or for those who dont like racing on open roads.
We will have plenty of helpers to keep you on track and to encourage you all the way to the finish.

For those who don’t want to take part in the run, there is an Aquabike (swim-bike) option, and for those who would like to compete as a team, there is a relay option, with 2 or 3 individuals sharing the disciplines between them.

The flat course is ideal for a personal best over the marathon distance. A whopping 94% of 2021 participants surveyed got a PB at our Dorney Lake Marathon.
The course has been measured by London Marathon course measurer Hugh Jones. Certified by UKA
The Marathon @ Dorney Lake has a maximum time restriction of 7 hours, after which there may not be marshals and time keepers available

Start times:

07:30am - Sprint Open

07:45am - Sprint Female

08:30am - Standard Open Under 50 only

08:45am - Standard Female and Over 50 Open

09:10am - Marathon

10:00am - Super Sprint

To participate in this event, you are required to become a member of British Triathlon and hold a race licence. You must either become a Core or Ultimate annual member here https://www.britishtriathlon.org/join or purchase a single use Race Pass for your race when purchasing your event ticket.

Need to hire a wetsuit? We are pleased to be able to offer Zone3 wetsuits. More information

Start times- subject to change:

Dorney Triathlon - August no-group

• 09/08/2025, 09:10

  Marathon

  Enter £40.00 - £42.00
• 09/08/2025, 10:00

  Super Sprint

  400m 10km 2.5km Enter £58.00
• 09/08/2025, 07:30

  Sprint

  750m 20km 5km Enter £78.00
  START TIME FROM 07:30am
• 09/08/2025, 07:30

  Sprint Relay

  750m 20km 5km Enter £99.00
  START TIME FROM 07:30am
• 09/08/2025, 07:30

  Sprint Aquabike

  750m 20km Enter £68.00
  START TIME FROM 07:30am
• 09/08/2025, 08:30

  Standard

  1500m 40km 10km Enter £99.00
  START TIME FROM 08:30am
• 09/08/2025, 08:30

  Standard Relay

  1500m 40km 10km Enter £120.00
  START TIME FROM 08:30am
• 09/08/2025, 08:30

  Standard Aquabike

  1500m 40km Enter £89.00
  START TIME FROM 08:30am

Location

Directions

Free parking available.

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