Our Black Friday deals go live on November 19th with our lowest prices this season! 

Grab the lowest prices of the season on every race, every event, every castle! From the UK to Ireland and France, our biggest discounts drop November 19th for a limited time only. Don’t miss your next triathlon, duathlon, aquabike, swim or run – once they’re gone, they’re gone!  

Not sure what event you want to tackle?

The wait is over – the 2026 Castle Race Series calendar is here! Whether you’re gearing up for your first-ever triathlon or chasing a new personal best, we’ve got the perfect event for you. 

From stunning castle backdrops to unforgettable race-day atmospheres, it’s time to start planning your next big adventure.

We’re thrilled to announce that our brand-new, shiny booking platform is launching very soon — and we can’t wait to share it with you! 

Get ready for a smoother, faster, and more intuitive experience. Booking your next Castle Race will be easier than ever — with quicker checkout, streamlined navigation, and all the event details you need right at your fingertips. 

Experience the best open water swimming in the world on a SwimTrek holiday. Choose from over 50 outstanding swimming locations around the globe, in the Mediterranean, Caribbean, Southeast Asia and more. Enjoy small group swimming adventures with professional guides and safety cover, and experiences to suit all levels of swimmer.  

Triathlon clubs: this is your chance to win £500 of custom kit for your team. Gear up with premium, club-branded apparel designed to perform on swim, bike and run, and look sharp on race day. 

Don’t miss out: entries take less than a minute. Enter now and put your team at the front of the pack. 

Join our coaching partners, Tri Training Harder, on their top-rated training camps in the Algarve, Portugal, in February or April this year. Castle Race Series athletes receive 10% off their camp price, and there are special rates for (non-training) partners and kids (non-training) go free! 

Discount code: CASTLE10