Framed as a sportive-style journey rather than an all-out race, the Castle To Coast Triathlon 2026 leads triathletes from the calm waters of Dorney Lake to the buzz of Brighton beach in a single, unforgettable day. The course opens with a sheltered 1.2-mile swim, then rolls into a c. 67-mile road ride across the Surrey Hills, with steady climbs, sweeping descents and big views over southern England. A final c. 14-mile trail run traverses the South Downs on mixed terrain before dropping to the finish line on the seafront, where athletes reunite with friends, club-mates and supporters. Relaxed cut-offs, fully supported logistics and a non-competitive ethos make it ideal for those who want a serious physical challenge without the pressure of pure racing. It’s a true castle-to-coast odyssey that blends endurance sport with scenery and shared adventure.
Race
On Saturday, 18 July 2026 at 08:00, the Castle To Coast Triathlon takes athletes on a unique point-to-point middle-distance adventure from Dorney Lake near Windsor, Buckinghamshire to Brighton seafront, organised by the Castle to Coast Tri team. Featuring a calm 1.2-mile lake swim, a ~67-mile road ride through the Surrey Hills and a 14-mile trail run across the South Downs to the beach, it’s designed as a supportive, sportive-style challenge that focuses on the journey rather than finish-time pressure.
Weather based on historical averages.
FAQs
What is the Castle To Coast Triathlon?
How long is the Castle To Coast Triathlon?
Where does the Castle To Coast Triathlon take place?
What is the elevation gain of the Castle To Coast Triathlon?
How can I prepare for the Castle To Coast Triathlon?
How do I choose the right training plan for the Castle To Coast Triathlon?
On Saturday, 18 July 2026 at 08:00, the Castle To Coast Triathlon takes athletes on a unique point-to-point middle-distance adventure from Dorney Lake near Windsor, Buckinghamshire to Brighton seafront, organised by the Castle to Coast Tri team. Featuring a calm 1.2-mile lake swim, a ~67-mile road ride through the Surrey Hills and a 14-mile trail run across the South Downs to the beach, it’s designed as a supportive, sportive-style challenge that focuses on the journey rather than finish-time pressure.
The Castle To Coast Triathlon is 22km long.
The Castle To Coast Triathlon takes place in Hassocks, United Kingdom.
The Castle To Coast Triathlon elevation gain is 396 metres, which Runna classifies as a Moderate race.
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Castle To Coast Triathlon?
On Saturday, 18 July 2026 at 08:00, the Castle To Coast Triathlon takes athletes on a unique point-to-point middle-distance adventure from Dorney Lake near Windsor, Buckinghamshire to Brighton seafront, organised by the Castle to Coast Tri team. Featuring a calm 1.2-mile lake swim, a ~67-mile road ride through the Surrey Hills and a 14-mile trail run across the South Downs to the beach, it’s designed as a supportive, sportive-style challenge that focuses on the journey rather than finish-time pressure.
How long is the Castle To Coast Triathlon?
The Castle To Coast Triathlon is 22km long.
Where does the Castle To Coast Triathlon take place?
The Castle To Coast Triathlon takes place in Hassocks, United Kingdom.
What is the elevation gain of the Castle To Coast Triathlon?
The Castle To Coast Triathlon elevation gain is 396 metres, which Runna classifies as a Moderate race.
How can I prepare for the Castle To Coast Triathlon?
The best way to train for the next race is to use a personalised training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Castle To Coast Triathlon?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Castle To Coast Triathlon or Active Training World (ATW). All event details are based on publicly available information and are provided solely to help users discover running events. Runna does not use any official logos, images, or proprietary content from this event or its organiser. Any trademarks or names mentioned are used descriptively to identify the event in a factual manner. For the most accurate and up to date information (including to register or purchase an entry to the event), please visit the Castle To Coast Triathlon website.