Royal Windsor Triathlon 2027
One of Britain's oldest triathlons. A Thames swim under Windsor Castle, a rolling bike through Berkshire lanes, and a three-lap town-centre run lined with crowds.
43 weeks to race day: base season
Plenty of runway. This far out, the win is a boring, consistent base rhythm: aerobic volume, strength, technique. The structured block starts closer in; what you do now decides how high it can climb.
Building for this one? Olympic distance training plan covers the sessions, the weekly shape and how the block is paced. The R.A.C.E. Framework explains why it is built that way.
Build my complete road.
Commit to the date and the work gets a shape: your countdown starts, the emails arrive in step with your build, and the app anchors a recovery-led block so the final week lands exactly on race day.
One confirmation email, then the road begins. Registering for the race itself stays with the organiser.
“A proper test with thirty years of history. The Thames swim reads scarier than it is: you swim with the current.”
The race
The course
No course maps for this race. The organiser publishes no downloadable route for any leg of this race, so there is nothing to draw a course map from. Everything below comes from the official course page, checked on the date at the foot of this section.
The Thames swim the race is known for, and it is not a straight downstream run: you start with the current, turn, and come back up against it. The upstream section is the hard part and it is at the end. Sprint swims 750m, Olympic 1,500m.
40km for the Olympic, 22km for the Sprint, out into the Berkshire and Buckinghamshire lanes from the town centre.
Three laps for the Olympic and two for the Sprint, taking in the Long Walk directly in front of Windsor Castle. Running on the royal estate is the reason people enter this one.
Not yet confirmed for this edition: swim lap count, bike lap count, elevation gain, cut-off times, water temperature, transition locations. We publish these only once they are on the official course page, so check there before you pace off anything here.
Course details verified against the official Royal Windsor Triathlon course page on 14 August 2026. Courses change; the official page is always the last word.
Questions, answered
When is Royal Windsor Triathlon 2027?
What distances can I race at Royal Windsor Triathlon?
How hard is the course?
What is the swim like?
How long do I need to train for it?
How do I enter?
Read before you race
Your First Triathlon.
IRONMAN Kalmar Swim Preparation for Open Water and Contact
Race Week Is Where People Unravel.
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This listing is for information only. Unbroken is not affiliated with, endorsed by, or sponsored by Royal Windsor Triathlon or its organiser. Details are based on publicly available information; names are used descriptively to identify the event. For accurate, up-to-date information and to enter, always use the official event website.