Castle To Coast Triathlon
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Event
Castle to Coast Triathlon is a point-to-point triathlon from Dorney Lake near Windsor to Brighton seafront. The event date shown is 18/07/2026. It is run as a sportive triathlon and is non-competitive, so it is not governed by the normal competition rules of British Triathlon.
Course and logistics
- 1.2-mile lake swim
- 67-mile cycle through the Surrey Hills
- 14-mile trail run across the South Downs
The organiser provides event support including course signage, mechanics, medical teams, and route managers. Bags are available at stops and a finish line meal is provided. A return transport option is offered to take participants and kit from Brighton seafront back to Windsor.
A team option is available for teams of two or three; this requires some self-support and a car to move team members and equipment between stages. Timing cutoffs are specified: the swim must be completed within 1 hour 20 minutes, the bike within 7.5 hours, and the run within 11.5 hours of the event start. Visit the organization's website for the most recent information.
