- Sat 19 Jul 2025
Castle To Coast Triathlon
08:00
Age 18 & over on 31 Dec 2025
£265-£295
- 1.2 miles lake swimming
- 67 miles road cycling + 3550 ft ascent
- 14 miles trail running + 1512 ft ascent
Event overview
This beautiful course starts with a calm 1.2-mile lake swim, before cycling 67 miles through the rolling Surrey Hills and onto a scenic 14-mile trail run across the South Downs all the way to Brighton seafront.
The route isn't the fastest way from A to B, it's the best way. Taking in the beauty of both the North and South Downs, it merges the beauty of views out over London and Brighton with rural villages and challenging climbs. It's easier to power up a climb knowing it's taking you one step closer to your end destination and leaving you with fantastic views over the top.
This is a course designed to be experienced and enjoyed, alongside friends and clubmates. With relaxed cut-offs and a fantastic supportive atmosphere, thanks to its sportive nature, this event brings something special to the sport that you won't regret taking part in, be this your first or hundredth triathlon.
What is a sportive triathlon?
In short, it means this is a non-competitive event and as such it is not governed by the normal competition rules of British Triathlon.
By focusing on the challenging journey itself and shedding the idea of a race, Castle to Coast opens up a number of otherwise closed possibilities, such as our non standard distances, relaxed starts, less restrictions around equipment, and most importantly the ability to complete the journey the whole way alongside your friends and club mates.
From making sure your bags are available to you at every stop on the journey, to delivering your finish line meal, logistics are all taken care of.
The event is fully supported from the thousands of arrows out on course, to the mechanics and medical teams. There will be a professional team of experienced route managers who make sure you have everything you need on event day.
Event photos
- All fitness levels
- Event village
- Newcomers
- Teams
Team option
Divide and conquer.
The team option is in part self-supported so you’ll need 2 or 3 team members and a car in order to make it happen.
Your swimmer will start the event by completing their 1.2-mile swim. On exiting the water, they will come into the transition village and pass the timing chip to the second team member, who will go out on the bike. Your team will then be responsible for transporting your runner (and swimmer) from Windsor down to Hassock,s ready to start the run.
After your runner has departed, you’ll collect your bike and load it into the car. The swimmer and cyclist will then make their way down to Brighton Seafront, ready to run down the finish chute together, collecting their medals and finish line goodies on the way.
- Rural
Event HQ
Dorney Lake
Off Court Lane, Lake End Road
Windsor
Buckinghamshire
SL4 6FJ
UK
- Cut off time
- Distance markers
- First aid
- Marshals
- Point to point
- Water stations
- GPX available
GPX route
The route is displayed on the map above.
Cut offs
- The Swim will need to be completed within 1hr 20min of the event start
- The Bike will need to be completed within 7.5hrs of the event start
- The Run will need to be completed within 11.5hrs of the event start
Map
What's included
- Chip timing
- Goody bag
- Medal
- Age 18 & over on 31 Dec 2025
- Entries open
- Enter online
Entry fees
Entry fee
£265.00
Entry fee
£295.00
Team entry fee
£295.00
What an awesome experience. Brutal and beautiful in equal measure. I still cannot quite believe I did it, the furthest distance and the most challenging event I have taken part in. Well organised, great pit stops, helpful marshals, well marked course, and lovely finishing area. Brilliant double-sided medal. Would highly recommend for anyone wanting to do something a bit different.
The swim was in an iconic Olympic location and the ride took us through the undulating Surrey Hills through some great scenery and beautiful villages. The run was brutal, however the fantastic countryside and views with minimal tarmac and urban setting, kept you going.