Royal Windsor Triathlon Celebrates 35th Anniversary With New Standalone 10k Run On 14 June 2026

Windsor, UK – The Royal Windsor Triathlon will celebrate its 35th anniversary on 14 June 2026 with an exciting new addition to race day. Organisers today announced the launch of a standalone 10k run, inviting even more participants to experience one of the UK’s most historic multisport events set around Windsor Castle, the River Thames and the Long Walk.

The Royal Windsor Triathlon is organised and delivered by RunThrough, the UK’s largest and most experienced running event organiser. The team brings deep running expertise, course design knowledge and a community-focused race culture to the event, building on its long-standing reputation as a highlight of the summer calendar. The new 10k distance represents the next step in the evolution of the event, strengthening the running offer within an already iconic triathlon weekend.

The 35th edition of the Royal Windsor Triathlon builds on a proud legacy of more than three decades. Generations of athletes have taken on the swim in the Thames, the open-road bike course, and the run around Windsor’s historic landmarks. The addition of a standalone 10k creates a new gateway for runners who want to soak up the Royal Windsor atmosphere without taking on the full triathlon, while keeping the spirit of the original event at its heart.

Over the years, the Royal Windsor Triathlon has welcomed professional triathletes and Olympians, including Stuart Hayes, Michelle Dillon and Emma Pallant-Browne. The new 10k invites club runners, charity runners and first-time racers to share the same race environment and support, with Windsor’s heritage and riverside setting providing an unforgettable backdrop.

“The Royal Windsor Triathlon has always been a jewel in the crown of British multisport, and we are incredibly proud to now call it a jewel in the crown of RunThrough too,” said Matt Wood, Co-Founder of RunThrough. “Bringing a dedicated 10k to the event allows us to open the gates of Windsor to even more people, whether they are local runners, charity participants or visitors from across the UK and beyond. As a team that lives and breathes running events, we see this as the perfect way to honour 35 years of history while growing the Royal Windsor Triathlon brand for the future.”

RunThrough has already built a strong calendar of events in the area, including the Windsor Trail Run series in January, March, August and November 2026, as well as the Maidenhead Trail Run in July 2026 and the Maidenhead Half Marathon in October 2026. Together with the Royal Windsor Triathlon, these events create a vibrant year-round running and racing scene across Windsor and Maidenhead.

“We are very fortunate to work with a fantastic group of local stakeholders who share our vision for the Royal Windsor Triathlon,” said Race Director, Ross Franks. “The support of the Royal Borough of Windsor and Maidenhead, landowners, local authorities, emergency services, businesses and residents is what makes this event possible each year. Adding a standalone 10k is the result of ongoing collaboration with these partners as we look at safe and sustainable ways to grow the event and welcome even more participants to Windsor.”

Entries for the Royal Windsor Triathlon and the new standalone 10k on 14 June 2026 are now open, and runners and triathletes of all levels are invited to be part of this landmark year in Windsor. Those who want to make the most of racing in the area can also join RunThrough at the Windsor Trail Run events in January, March, August and November 2026, the Maidenhead Trail Run in July 2026, and the Maidenhead Half Marathon in October 2026, building a full year of unforgettable running moments across Windsor and Maidenhead.

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For media entries or more information please contact Jamie Dellimore using the email address below.

Press Contact: 

Jamie Dellimore, RunThrough Head of Content Marketing: [email protected]

About Royal Windsor Triathlon & RunThrough: RunThrough is the proud operator of the Royal Windsor Triathlon, bringing its expertise in mass-participation event delivery to one of the UK’s most iconic multisport races. As the UK’s largest and Europe’s fastest-growing running events company, RunThrough delivers over 300 events annually, welcoming more than 350,000 participants each year.

RunThrough sits under the GW Active parent brand that also encompasses the RT Kit, RunThrough Trails, Swim Bike RunThrough as well as flagship events including Hampton Court Palace Half Marathon, Surrey Half Marathon, Alton Towers Resort 10km and Half Marathon alongside the full calendar of events. RunThrough’s mission is to inspire a more active nation through running and the provision of quality, inclusive event experiences for runners of all ages and abilities and to be a leading voice within the endurance and mass participation industries. The organisation was founded in 2012 by Matt Wood and Ben Green, two former international runners from the north-west of England with a dream to share their passion for running to inspire the nation. 

Follow Royal Windsor Triathlon on Social Media:
Instagram: @RoyalWindsorTri
Facebook: @RoyalWindsorTri