Triathlon and Multisport Festival 6 – 7 June 2026
Château de Chantilly Multisport Event! Pick your discipline; triathlon, duathlon, run and swim – and choose a distance. Recruit your friends and celebrate completing your challenge in our festival village.
Returning in 2026! The Bastion | Full Iron Distance
On Sunday 7 June 2026 we will host a full iron distance race at the Château de Chantilly Multisport Event. “The Bastion” will be the closest full iron race to Paris and will feature a 3.8km swim, a fast 180km bike and a stunning 42.2km run through the grounds of the beautiful château.
The Bastion 140.6 will be part of a wider festival of multisport at the château over the weekend of 6-7 June, coinciding with 2026 hosting our 16th edition of the event. Each Bastion entrant will receive a finisher t-shirt, rucksack, a post-race meal and massage along with our iconic medal.
Book early to secure the biggest discount
Venue | The finest jewel
The majestic Château de Chantilly, Hauts-de-France region, will host the second event of our 2026 Season. Throughout the weekend, athletes and spectators will be able to enjoy the castle grounds and a festival village atmosphere featuring live music, shopping, food and drink, children’s entertainment, yoga and more.
Whether you into swim, bike, run or all three this stunning venue won’t disappoint. Swimmers can enjoy the serene Grand Canal, a 2.5km long tributary of the Oise. See wetsuit rules here. The cycle routes circumnavigate the arrow straight bridleways of the Foret de Chantilly, with the run sections named after the Maison de Sylvie that it surrounds.
Races | A plethora of race options
This weekend festival of sport will host a huge range of races for all ages and abilities. Regardless if you’re 9 or 90 years old, a first-timer or an elite, we have a race for you! Pick from run ,triathlon, duathlon, and swim races. You can also race with a team of friends in one of our relays options! Scroll down to see the full list of races.
View our in-depth 2025 Event Competitor Guide to get a flavour of what to expect on race day. Those interested in the Half Iron distance can view the 2025 Gauntlet Course Guide. 2026 Editions will be uploaded early next year. Use the buttons below for full list of races and course maps. The 2025 Race Report gives you a flavour of what to expect on race day.
Race Documentation | All Participants
All participants are required to produce –
- licences for triathletes duathletes and swimmers athletes
- runners: PPS health form for swimmers
- FFN licence or medical certificate
Don’t put it off, complete your documentation requirement now and ensure a hassle free arrival on race day!
Château de Chantilly Multisport Event will be endorsed by the Fédération Française de Triathlon.
