Eton Dorney Triathlons
Sunday 21st September 2025
Introduction:
The Olympic venue, Eton Dorney, offers pan flat, traffic-free roads, and a beautiful clear lake. The venue is private and specifically hired for the purpose of a traffic-free triathlon event.
Date:
Sunday 21st September 2025
Distances and prices:
Individual - Super sprint - 450m/10km/2.5km - £62.00
Individual - Sprint - 750m/20km/5km - £72.00
Individual - Standard - 1.5km/40km/10km - £82.00
Team - Super sprint - 450m/10km/2.5km - £77.00
Team - Sprint - 750m/20km/5km - £87.00
Team - Standard - 1.5km/40km/10km - £97.00
Schedule:
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)
Company corporate group bookings are welcome, please contact pete@votwo.co.uk for information
Location:
Dorney Lake, Eton College Rowing Centre, off Court Lane, Dorney, Windsor, Berkshire, SL4 6FJ
Course:
Flat and very, very fast! Dorney Lake is renowned for its traffic-free, smooth tarmac course. The perfect setting for first-time racers and more experienced athletes alike. See the course maps at the bottom of this page.
Swim Course:
Super Sprint = x 1/2 lap. Sprint = 1 lap. Standard = 2 laps
750m 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 marked by large inflatable buoys. Keep these to your right.
Bike Course:
Super Sprint = X 2 laps. Sprint = X 4 laps. Standard = X 8 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.
Run Course:
Super Sprint = X 1/2 lap. Sprint = X 1 lap. Standard = X 2 laps.
Clockwise, looped course using the lakeside path and returning on the estate road. Drinks stations at the far and close turn points.
Transition:
The transition area is in front of the shower/toilet block and event registration.
What’s 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
Pre-Event Information Pack: (2024 details now online!)
It is a condition of entry to this event that you participate according to the instructions in the event information.
Team/Relay:
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.
Finishers Medals:
Your medal will be issued to you just after the finish line.
“I absolutely love this event and venue. The Votwo staff could not have been more helpful for my first ever Triathlon!”
— Julie Kettler
Please note that all merchandise is to be collected at the event. No items are posted.
Event Rules:
As part of the entry system to the event all participants agree to the following:
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
All cyclists will wear a correctly fitted BS-EN cycle helmet
Cycles must have working front and rear brakes and all equipment must be in good serviceable order
Drafting and riding in groups is not permitted
Rules continued:
Cyclists must ride on the left-hand side of the track and overtake on the right
Runners must run on the left-hand side of the path and overtake on the right
All cyclists will adhere to the rules and regulations of the highway code. Details can be found here
Full event rules and instructions can be found in the participant information pack published on this page nearer the time of the event
Spectators:
Eton Dorney is the perfect venue for spectators with a large viewing balcony and cafe at the boathouse.
Refunds / Transfers:
Please ensure you read and agree to the Votwo Events terms and conditions when you enter the event. In brief, the refund policy is as follows:
Any event entry cancellation received by email to events@votwo.co.uk more than 14 days prior to the event date will receive a 50% refund or transfer of entry fee towards another votwo event (£5 transfer fee applies). Only emailed cancellations are acceptable. Cancellations made in the 14 days prior to the event start date will not be eligible for any refund or transfer.
For full Votwo T&C's please click here.
Course Maps
Swim. X2 Laps for the Standard, 1 lap for the Sprint, and x 1/2 lap for the Super Sprint.
Bike. X 8 laps for the Standard, X 4 laps for the Sprint and x 2 laps for the Super Sprint.
Run. X 2 Laps for the Standard, X1 lap for the Sprint and x 1/2 lap for the Super Sprint.
