- Sun 21 Sep 2025
11:30
Age 15 & over on 31 Dec 2025
£62-£77
- 450 m lake swimming
- 10 km road cycling
- 2.5 km trail running
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
This event is part of Eton Dorney Triathlon & Swims.
Event photos
- All fitness levels
- Dogs allowed
- Event village
- Families
- Free venue entry
- Newcomers
- Spectators
- Swim hat provided
- Teams
- Wetsuit not allowed if too hot
- Wetsuit required if too cold
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.
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.
- First aid
- Flat
- Marshals
- Multiple laps
- No cut off time
- No headphones
- PB
- Toilets
- Traffic free
- Water stations
- Wave start
- GPX available
GPX route
The route is displayed on the map above.
Swim
Super Sprint = x 1/2 lap.
Half a lap of the 750m route, clockwise. Rectangle course with the swim exit into transition. The water is very clean and clear. The lake tends to warm up very quickly after a few days of sunshine. The course is marked by large inflatable buoys. Keep these to your right.
Map
Bike
Super Sprint = X 2 laps.
Clockwise lapped course around the return lake. Each lap is 5km long. Ride on the left-hand side and overtake on the right. No drafting or riding as a group. It is advisable to use a GPS or bike odometer to aid in counting laps.
Map
Run
Super Sprint = X 1/2 lap.
Clockwise, looped course using the lakeside path and returning on the estate road. Drinks stations at the far and close turn points.
Map
Sustainability
- Bring your own cup
- Recycling
- Reusable cups
- Chip timing
- Map
- Medal
Included
- Finishers medal
- Great traffic-free location
- On-site free car parking
- Water safety cover
- Chip timing
- Online results
- Water station in transition and on the run course
- Toilets
- Event medics
- Age 15 & over on 31 Dec 2025
- Entries open
- Enter online
- Event merch available
- Race pack by email
Relay teams
Teams of 3.
Entry fees
Entry fee
£62.00
Team entry fee
£77.00
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
Other races at event
- Sun 21 Sep
- #2 of 0
10:00
Age 15 & over
£72-£87
- 750 m lake swimming
- 20 km road cycling
- 5 km trail running
- Sun 21 Sep
- #3 of 0
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Age 17 & over
£82-£97
- 1.5 km lake swimming
- 40 km road cycling
- 10 km trail running
- Sun 21 Sep
- #4 of 0
14:00
Age 16 & over
£30
- 2.5 km lake swimming
- Sun 21 Sep
- #5 of 0
14:00
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£35
- 3.8 km lake swimming
- Sun 21 Sep
- #6 of 0
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£42
- 5 km lake swimming
- Sun 21 Sep
- #7 of 0
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Age 16 & over
£52
- 10 km lake swimming