Eton Dorney Triathlon & Swims
Sun 21 Sep 2025 Windsor, Buckinghamshire, UK

Eton Dorney Triathlon & Swims

The Olympic venue, Eton Dorney, offers pan-flat, traffic-free roads and a beautiful clear lake for all levels of triathletes and swimmers to enjoy in an exclusive setting.

7 races

  • Sun 21 Sep
  • #1 of 7
Dorney Lake, Windsor

Super Sprint

11:30

Age 15 & over

£62-£77

  • 450 m lake swimming
  • 10 km road cycling
  • 2.5 km trail running
  • Sun 21 Sep
  • #2 of 7
Dorney Lake, Windsor

Sprint

10:00

Age 15 & over

£72-£87

  • 750 m lake swimming
  • 20 km road cycling
  • 5 km trail running
  • Sun 21 Sep
  • #3 of 7
Dorney Lake, Windsor

Standard

08:00

Age 17 & over

£82-£97

  • 1.5 km lake swimming
  • 40 km road cycling
  • 10 km trail running
  • Sun 21 Sep
  • #4 of 7
Dorney Lake, Windsor

Swim Long | 2.5K Swim

14:00

Age 16 & over

£30

  • 2.5 km lake swimming
  • Sun 21 Sep
  • #5 of 7
Dorney Lake, Windsor

Swim Long | 3.8K Swim

14:00

Age 16 & over

£35

  • 3.8 km lake swimming
  • Sun 21 Sep
  • #6 of 7
Dorney Lake, Windsor

Swim Long | 5K Swim

13:30

Age 16 & over

£42

  • 5 km lake swimming
  • Sun 21 Sep
  • #7 of 7
Dorney Lake, Windsor

Swim Long | 10K Swim

12:30

Age 16 & over

£52

  • 10 km lake swimming

Event overview

The venue is private and specifically hired for the purpose of a traffic-free triathlon and swimming events.

Flat and very, very fast! Dorney Lake is renowned for its traffic-free, smooth tarmac course. It is the perfect setting for first-time racers and more experienced athletes alike.

I absolutely love this event and venue. The staff could not have been more helpful for my first ever triathlon! 

Julie K

Highlights

  • Great traffic-free location
  • Beautiful clear lake
  • Smooth, flat tarmac course
  • Experience the Olympic venue
  • Super friendly event crew
  • Water safety cover
  • Chip timing and online results
  • Finishers medal
  • Brand new design merch
  • Free onsite parking

Event community

Charlie D.

Charlie D.

  • All fitness levels
  • Dogs allowed
  • Event village
  • Families
  • Free venue entry
  • Newcomers
  • Spectators
  • Teams

Timetable

Triathlon briefings will be held 10 minutes before the start in the swim in area. You must attend the briefing ready to start your triathlon.

  • 08:00 | Wave 1 | Standard (Males 16 - 39)
  • 08:30 | Wave 2 | Standard (Males 40+ and Teams)
  • 09:15 | Wave 3 | Standard (Females)
  • 10:00 | Wave 4 | Sprint (Males 16 - 39)
  • 10:30 | Wave 5 | Sprint (Males 40+ and Teams)
  • 11:00 | Wave 6 | Sprint (Females)
  • 11:30 | Wave 7 | Super Sprint (Mixed and all ages)
  • 11:30 | Venue open to swimmers for registration
  • 12:30 | 10km Swim starts
  • 13:30 | 5km Swim starts
  • 14:00 | 3.8km and 2.5km Swims start

Teams

All the distances are open to teams of 3.

Each team member completes a discipline in succession. You must inform the staff at registration that you are a team entry as you will have specific instructions for handing the chip between team members.

Spectators

Eton Dorney is the perfect venue for spectators with a large viewing balcony and cafe at the boathouse.

  • Bag storage
  • Cafe
  • Changing facilities
  • Free parking
  • Park
  • Rural
  • Showers
  • Toilets
  • Urban

Event HQ

Dorney Lake
Off Court Lane, Lake End Road
Windsor
Buckinghamshire
SL4 6FJ
UK

Transition

The transition area is in front of the shower/toilet block and event registration.

Sustainability

  • Bring your own cup
  • Recycling
  • Reusable cups

I absolutely love this event and venue. The staff could not have been more helpful for my first ever triathlon! 

Julie K

Everything about the event was fantastic. I was a first timer, completed it with my daughter although we had different start times and loved every minute of it. Lovely atmosphere and good to be a part of. David P

I cannot fault this race. My family love it too as they can bring a picnic and see me on all three disciplines without moving. Perfect spectator event - not one for the locals though. Hayley M

Excellent organisation. Very flat and safe course so can easily do a PB. SD

A nice swim in the 2012 Olympic rowing course, an almost flat bike and run course means this is a place you could easily set a new PB (providing the wind isn't like a wall hitting you as you come round for the second half of the bike, like it did last weekend!). Friendly and efficient registration, transition and marshalling - and good natured support from a fairly sparse crowd - made this an enjoyable race. Bonus was being able to park near the start and easy access to T1 and T2. Definitely want to do more at this venue...something that many fellow competitors agreed with! Colin M

Reviews thanks to RaceCheck

Races at event

  • Sun 21 Sep
  • #1 of 7
Dorney Lake, Windsor

Super Sprint

11:30

Age 15 & over

£62-£77

  • 450 m lake swimming
  • 10 km road cycling
  • 2.5 km trail running
  • Sun 21 Sep
  • #2 of 7
Dorney Lake, Windsor

Sprint

10:00

Age 15 & over

£72-£87

  • 750 m lake swimming
  • 20 km road cycling
  • 5 km trail running
  • Sun 21 Sep
  • #3 of 7
Dorney Lake, Windsor

Standard

08:00

Age 17 & over

£82-£97

  • 1.5 km lake swimming
  • 40 km road cycling
  • 10 km trail running
  • Sun 21 Sep
  • #4 of 7
Dorney Lake, Windsor

Swim Long | 2.5K Swim

14:00

Age 16 & over

£30

  • 2.5 km lake swimming
  • Sun 21 Sep
  • #5 of 7
Dorney Lake, Windsor

Swim Long | 3.8K Swim

14:00

Age 16 & over

£35

  • 3.8 km lake swimming
  • Sun 21 Sep
  • #6 of 7
Dorney Lake, Windsor

Swim Long | 5K Swim

13:30

Age 16 & over

£42

  • 5 km lake swimming
  • Sun 21 Sep
  • #7 of 7
Dorney Lake, Windsor

Swim Long | 10K Swim

12:30

Age 16 & over

£52

  • 10 km lake swimming