Hever Castle Triathlon 2026
The world's biggest castle triathlon and the traditional end of the British season. A lake-and-river swim, a genuinely lumpy Kent bike, and a run through the castle grounds.
6 weeks to race day: the sharpening window
A full build no longer fits, but a sharp one does. This close in, the job is specificity and freshness: race-pace touches, open-water or brick rehearsal, and a taper your nervous system actually absorbs. No heroics; arrive fresh.
Building for this one? 70.3 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.
Adapt my training to this course.
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.
“The season closer. Hilly, honest, and beautiful. Race it for the day out, not the PB.”
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 lake in the Hever Castle grounds and a loop of the river. Distances shown are for the Gauntlet; the series also runs Sprint and Olympic starts across the weekend, plus a separate open water swim series on the Saturday over 1 mile, 2.5km and 5km.
Two laps of a 45km Kent circuit. The organiser lists this as the 90K route but the route they link measures 45.2km, so it is a two-lap course. Shorter races ride 20km or 14km versions.
Two laps of the 10.5km estate route, which measures almost exactly 10km on the organiser's own map. Sprint and Olympic fields run 4km and 2.5km loops of the same ground.
Not yet confirmed for this edition: swim 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 Hever Castle Triathlon course page on 14 August 2026. Courses change; the official page is always the last word.
Questions, answered
When is Hever Castle Triathlon 2026?
What distances can I race at Hever Castle 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
IRONMAN 70.3 Tallinn Training Guide
How Much Harder Is a Full IRONMAN Than a 70.3?
Your First Triathlon.
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Photograph of Hever, Kent: Peter Trimming, CC BY-SA 2.0, via Wikimedia Commons. Not official race photography.
This listing is for information only. Unbroken is not affiliated with, endorsed by, or sponsored by Hever Castle 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.