Blenheim Palace Triathlon 2026: Race Preview, Distances and Course Guide
The Blenheim Palace Triathlon returns on 6–7 June 2026, bringing thousands of athletes to the stunning grounds of Blenheim Palace in Woodstock, Oxfordshire. Operated by Supertri, it is widely regarded as the UK’s biggest and most iconic triathlon event. Whether you’re racing, spectating, or planning for next year, here’s everything you need to know.
Race Details
- Dates: Saturday 6 & Sunday 7 June 2026
- Venue: Blenheim Palace, Woodstock, Oxfordshire, OX20 1PP
- Organiser: Supertri
- Swim: Open water lake within the Blenheim Palace grounds
- Bike: Closed-road loop through the estate and surrounding Oxfordshire countryside
- Run: Two-lap course around the iconic palace grounds
Race Distances
Blenheim caters for every ability level, from first-time triathletes to experienced club racers:
- SuperSprint: 400m swim / 13.3km bike / 2.9km run — ideal for beginners and younger athletes
- Sprint: 750m swim / 19.8km bike / 5.4km run — the flagship distance
- Sprint Relay: Teams of 2–3 athletes, each completing a leg of the Sprint course
- Duathlon (Half): Run–bike–run format for non-swimmers
- Duathlon (Full): Longer duathlon on the same stunning course
Key Storylines for 2026
British legend Jonny Brownlee is confirmed to race at Blenheim 2026, adding a star-studded edge to the elite field. With two Olympic gold medals and a career defined by iconic Blenheim performances, his presence guarantees a memorable occasion. Expect a fast elite race on what is already one of the sport’s most spectacular settings.
Course Guide and Tips for Competitors
- Lake temperatures: Expect 14–17°C in early June. Wetsuits are likely mandatory for most categories — check official guidance as race day approaches.
- Transition is compact: Blenheim has a busy, tightly racked transition area. Know your rack number, walk the layout during registration, and practise quick kit changes beforehand.
- Bike course is rolling: The Oxfordshire countryside is gently undulating. Avoid overcooking the early climbs — there’s no dramatic hill, but consistent effort management pays dividends on the run.
- Run finish is iconic: The final straight approaching the palace facade is one of UK triathlon’s great moments. Soak it in.
- Logistics: Arrive early — the site is large but access roads fill up quickly. Check the Supertri athlete guide for designated parking areas and transition bag drop timings.
How to Enter
Entries for Blenheim Palace Triathlon 2026 are available via Supertri at by.supertri.com/blenheim-palace-triathlon. Entries sell fast — if you’re targeting Blenheim as a first race or a benchmark event, secure your place as soon as possible.
