Pop-up City Triathlon
24-27 April 2017

Lough Cutra Castle
27/28 May 2017

Cholmondeley Castle
24/25 June 2017

The Festival of Endurance at Hever Castle
9 July 2017

Castle Howard
22/23 July 2017

Château de Chantilly
26/27 August 2017

Hever Castle
23/24 September 2017


The perfect long distance training ground

Are you interested in going long? These long distance challenges are the perfect training ground to prepare for any upcoming iron-distance races or ultra distance swims.

Going Long at the Bastion

10 July 2016

The perfect training ground

We are offering you the chance to swim the 3.8km iron-distance or swim, bike and run sections of the Bastion course, fully timed and fully supported just like those taking on the iron-distance race along side you.

The perfect training to prepare for any iron-distance challenge or to get an idea of what might await you next year should you return for the ultimate Castle Triathlon Series challenge and take on The Bastion in 2017.

This is a fantastic long distance swim training and long distance race tri training set in a stunning location in mid-summer, perfect for those who are taking on an iron-distance race in the second half of 2016.

The Aquabike Challenge

Sunday 10th July 2016

Entry Price

  • £75 – 1.9k swim: 60k cycle: 4k optional run (Laps 1:1:1)
  • £110 – 3.8k swim: 120k cycle: 4k optional run (Laps 2:2:1)

Arrival and Start times

  • 08:30 – 09:30 Registration /Transition opening times
  • 10:00 Swim start time

There’s a training option for everybody into long distance.  After the unique swim you’ll head out on the fully marshalled and signed bike course with supported feed stations. This circular cycle route will take competitors out of Hever Castle, up through the High Weald of Kent before passing through and over the Ashdown Forest and into the village of Maresfield.  After a quick tour of the village competitors retrace their steps to the top of the forest before returning to Hever via the historic and quintessentially English villages of Groombridge, Fordcombe and Penshurst.  Finishers have the option of finishing with a gentle 4K run that circumnavigates the lake and stunning grounds of the Hever estate.

The Aquathlon Challenge

Sunday 10th July 2016

Entry Price

  • £60 – 1.9k swim : 10k run (Laps 1:1)
  • £90 – 3.8k swim: 21k run (Laps 2:2)

Arrival and Start times

  • 08:30 – 09:30am Registration /Transition opening times
  • 10:00 Swim start time

After the unique swim (1 or 2 loops), competitors will then embark on the 10k/21km run course, which follows largely off road tracks and bridle paths between Hever Castle, through the historic local village of Chiddingstone, before finishing right in front of the Castle.

The Hever Long Distance Swim

Entry Price

  • £35 – for the 1.9k circuit
  • £50 – for the 3.8k circuit

Arrival and Start times

  • 08:30 – 09:30am Registration /Transition opening times
  • 10:00 Swim start time

The swim course leaves from the Italianate loggia taking competitors down the length of the main lake and heading into the scenic river section.This tributary of the River Eden wraps around 16 Acre Island allowing spectators to watch and cheer competitors on from only a few meters away. The Speedo team will be on hand to welcome you at the finish, then it’s time to relax and enjoy a complimentary bacon roll back at the Event Village.

The unique Hever Castle lake and river swim

10 July 2016

With exclusive access to the unique Hever Castle lake and river swim, a fully supported bike course and the option to finish on a gentle run circumnavigating the estate – there’s a training option for everybody into long distance course.

Once you’ve finished, hopefully happy with your times in hand, you can relax with some complimentary hot food and watch the action of The Bastion unfold, cheering on the professionals and age groupers racing for glory, fun or the personal challenge and maybe consider doing it yourself next year!

In addition, competitors can book to stay at the luxurious Hever Castle Bed and Breakfast or book a pitch at the onsite camping.

I am really excited to be racing the 3.8km OW swim at Hever Castle. An opportunity to race in such an iconic location full of history is a chance not to be missed. Well done to Castle Tri for securing these magnificent venues for racing at

Dan Bullock
Speedo Swim Coach
Race distances

Race distances

For the absolute beginners and children to the professional triathletes, the Castle Triathlon Series offers a wealth of race distances to suit all levels.

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Hosted at a selection of stunning and iconic castles across the UK, Ireland and France, the Castle Triathlon Series events all promise an inspirational and memorable race experience.

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Take part

We pride ourselves on offering a bespoke and tailored offering for all those wishing to take part and grateful for all those who want to be involved on the day.

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We would always recommend training in preparation for any event, but how much you do, and the style you take is down to you.

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