Castle To Coast Triathlon

JUL
18
2026
Castle To Coast Triathlon is a scenic point to point sportive from Dorney Lake near Windsor to Brighton seafront, combining a lake swim, a long bike leg and a 14 mile trail run across the South Downs. Solo and team entries enjoy full support and a memorable seaside finish.
Sat 18 Jul 2026
1.2 Mile Lake Swim 14 Mile Run 67 Mile Bike

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Event overview

Castle To Coast Triathlon is a point-to-point sportive triathlon running from Dorney Lake near Windsor to Brighton Sea Front. The standard solo route comprises a 1.2 mile lake swim, a long bike section and a 14 mile trail run across the South Downs to Brighton. Some entry options list the bike section as 67 miles or 66 miles depending on the chosen entry type. The event is organised as a non-competitive sportive and is not governed by British Triathlon competition rules.

Details

Distances for the solo and team options:

  • 1.2 miles swim
  • 66–67 miles bike
  • 14 miles run

The event offers a team option for 2 or 3 members which requires a car to transfer team members between disciplines. Support services include route signage, mechanical assistance, medical teams, and on-course route managers. Organisers handle logistics such as bag transfers at stops and a finish line meal. A return transport option is available to take participants and kit from Brighton back to Windsor. Entry prices range from £265.00 to £293.00 depending on the entry type. Eligibility notes list solo entries open to those aged 18 and over and team entries open to those aged 16 and over. Time cutoffs are published: swim within 1hr20min, bike within 7.5hrs, and run within 11.5hrs. Visit the organization's website for the most recent information.

14 mi
14 Mile Run
1.2 Mile Lake Swim
67 Mile Bike