Dorney Triathlon

29th August 2021

Starting from 07:00am

This event is organised by Active Training World & RunThrough Events

Dorney Triathlon


Take on a Sprint or Standard distance and take the opportunity to race around this unique and inspiring Olympic venue!! This event is non-draft legal.

The flat and scenic grounds lend themselves to a totally flat bike and run course, the ideal venue for a chip timed personal best. We will have plenty of helpers to keep you on track and to encourage you all the way to the finish.

The Sprint triathlon will begin at 07:00am and will take the style of a time trial with athletes started at 20 second intervals with the fastest athletes starting the swim first. This is based on the estimated finish time given during registration.

The Standard triathlon will start at 08:30pm in the same format.

Many people are understandably nervous regarding entering events again and we want to assure you that we take every measure we can to organise a safe, socially distanced event. To see this in action watch our video Covid-19 Safety at ActiveTrainingWorld Running and Triathlon Events

We want you to book with confidence so, if this event can no longer go ahead, and an alternative date isn’t found, you will be offered a virtual run or a refund of your entry fee. (Booking fees are non-refundable)

Sunday 29th August 2021
Start Times: 

07:00am – Sprint Triathlon
08.30pm – Standard Triathlon

LOCATION: Dorney Lake, Court Lane, off Lake End Road, Windsor SL4 6FJ

Online entries: Pay by major credit/debit cards


Race numbers will be collected at the the event venue on the morning of the race.

Registration opens at: 06:00am for the Sprint Duathlon and 07:30am for the Standard Duathlon
The day license for Non-BTF members is included in the entry price.

There will be an online race briefing made available before the event, it is mandatory to have watched this as there will be no pre-race briefing on the day.

Please arrive in sufficient time to collect your race number.

Book your place

  • If you are booking more than 1 place, please ensure that you complete the individual details for each attendee accurately answering all the questions on their behalf.
  • Relay entries should be completed with lead entrant’s details only. Additional team members’ details will be taken at Registration on the day
  • The BTF Day License for the event is included in the price of a Non BTF Entry


Details Price Qty
Dorney Triathlon Standard Entry Non BTF Member £76.00 (GBP)  
Dorney Triathlon Standard Entry BTF Member £70.00 (GBP)  
Dorney Triathlon Standard Relay Entry Non BTF Member £76.00 (GBP)  / bundle 
Dorney Triathlon Standard Relay Entry BTF Member £70.00 (GBP)  / bundle 
Dorney Triathlon Standard Aquabike Entry BTF Member £60.00 (GBP)  / bundle 
Dorney Triathlon Standard Aquabike Entry Non BTF Member £66.00 (GBP)  / bundle 
Dorney Triathlon Sprint Entry Non BTF Member £66.00 (GBP)  
Dorney Triathlon Sprint Entry BTF Member £60.00 (GBP)  
Dorney Triathlon Sprint Relay Entry Non BTF Member £66.00 (GBP)  / bundle 
Dorney Triathlon Sprint Relay Entry BTF Member £60.00 (GBP)  / bundle 
Dorney Triathlon Sprint Aquabike Entry Non BTF Member £56.00 (GBP)  / bundle 
Dorney Triathlon Sprint Aquabike Entry BTF Member £50.00 (GBP)  / bundle 




We actively welcome support and involvement from local communities, businesses and individuals. If you would like to find out more about marshalling, sponsorship or group bookings please contact us at the address below.

Spectators are currently not allowed at Dorney Lake. If this situation should change we will update this page.

If you would like more info on this event please use the email address below:


Custom designed medal for all finishers! 

There will be no prizegiving on the day but you will be able to collect your medals.

There will be full results on the chip timing website both overall and by category.

Course Information

The run course uses a traffic-free, flat 5km lap. The bike course uses a traffic free, flat 4.8km lap.

Dorney Lake Swim Course

The route is clockwise. The course will be well marked with swim buoys after completing your lap, you will head for the swim exit marked by flags.

Dorney Lake Bike Course

The 5km bike loop will be completed 4 times for sprint distance athletes and 8 times for standard distance athletes. It is your responsibility to count your own laps. We find the best way of doing this is with the aid of a bike computer or watch.

Dorney Lake Run Course

Starting from the transition area, triathletes will run either 1 or two out and back loops, alongside the lake. The run course uses a traffic-free, flat 5km lap.

Training Plans

Need help with your running? Whether this is your first triathlon and you want to know how to prepare, or you are looking to smash your personal best – following a training plan will increase your chances of achieving your goals.

Visit the ATW Shop to submit your requirements for a fully customised run training plan.


Other Race Information

It is important that you are fit to run and have not experienced any Covid-19 symptoms in the 14 days leading up to the event.

Race Numbers
Please wear your number pinned to the front of your vest.

Free parking available

Changing Facilities
We will not be providing a changing area, therefore please come changed and ready to race.

Baggage Drop
There will be an informal baggage drop area for you to leave any belongings within the transition area.

There will be toilets a short distance from the transition area.

If you are unable to attend due to illness, injury, family bereavement, jury service you will only be eligible for a refund on production of official evidence: Positive Covid-19 test result, Doctor’s note, Death Certificate etc.

Event Cancellation
If the event should have to be cancelled due to reasons beyond ATW’s control (for example, severe weather, local or national lockdown) entrants will be given a range of options to choose from, which will include a refund of their entry fee.


By entering this event you agree to the below terms and conditions:

Your details will kept in accordance with the Active Training World Privacy Policy

Your name, date of birth and email details will be onto the chip timing company. Personal details will be deleted 1 week after the event.

Where specified on the booking form any medical information will be passed onto the medical team present at the event. 


1) I am over the age of 17 (Standard Duathlon) /15 (Sprint Duathlon) as at 31/12/2021. 

2)  I declare that I am medically fit to compete & understand that I do so entirely at my own risk.

3) I understand that I enter the race at my own risk and that no person(s) or organisation(s) will be held responsible for any accident, injury or loss to myself, prior to, during or after the event.

4) I understand the organisers reserve the right to alter the arrangements and conditions, should circumstances require.

5)  By entering this event, I accept BTF rules.