In 2021, we will host 12 industry-leading event weeks with races for all ages and abilities across the UK, Ireland and France.

These are fun, inclusive, festival weekends where athletes, their supporters and local communities come together to celebrate the physical and mental benefits of an active lifestyle. Everyone is welcome to come along to compete, volunteer or cheer!

Athletes will compete across multiple disciplines - triathlon, multisport, swimming, running, cycling, colour and obstacle - and a variety of distances from starter to ultra.

As a community, we are raising as much money as possible for our National Charity Partner, Macmillan Cancer Support, so that they can provide the practical, emotional and financial support for people affected by cancer.

Click here for more information about The Castle Series and Macmillan's partnership.

Please note: this page is only for direct donations to the Castle Series partnership. If you are taking on a Castle Series event for Macmillan, you will need to set up your own JustGiving page by choosing "Start Fundraising" above.

If you have any questions about this just contact triathlon@macmillan.org.uk