Dorney Lake Christmas Duathlon & Lake Runs

Next Race: 11/12/2021

Dorney Lake, Lake End Road, Eton College, WINDSOR. SL4 6FJ

Set at the spectacular, flat and smooth-surfaced Dorney Lake near Windsor, this event takes you around the perimeter of the iconic water.


The legendary Eton Dorney, as Dorney Lake was called by London 2012, held 30 events throughout the Olympics, with Team GB taking a total of 12 medals. Soak up the atmosphere and invoke their heroics to inspire you to a new PB!


The Dorney Lake course is nestled amongst 450 acres of glorious parkland which includes an Arboretum and Nature Conservation area whilst being just a few miles from Windsor and a short drive from Heathrow airport and west London.



If you’re participating this year, please consider running for Alzheimer’s Research UK to raise vital funds for dementia research. As the UK’s leading dementia research charity, Alzheimer’s Research UK is dedicated to causes, diagnosis, prevention, treatment and cure. Their mission is to bring about the first life-changing treatment for dementia by 2025 and they need your support! Join #TeamARUK



On entering this event, you should receive booking confirmation within 5 minutes. If it does not arrive, please check your spam/junk folder. Further event details will be communicated via email (to the address provided during registration) in the week prior to the event.


Entry on the Day will not be available at this event.


This event will be Licensed with the British Triathlon Federation (BTF) and UK Athletics (UKA).


All of our events are organised following government and governing body COVID-19 guidance. We will continue to ensure that we deliver safe and enjoyable events.

Event Details


The Cycle route is flat, on tarmac (drafting not permitted) and follows a route around the lake.

The Run route is flat and on tarmac. Each distance follows a 5K lap around the lake with a longer first lap for Half Marathon runners.


Bib Numbers (and bike stickers/swimming caps where applicable) will only be available for collection at the event, participants should not expect to receive anything by mail.


To be fastened to the front of your top using safety pins provided, your number should be visible at all times. Your timing chip is attached to the back of your number and should not be removed.


Participants in events containing a Swim or Cycle element will also be provided with an ankle tag and neoprene strap which must be returned on completing the event. Swimming caps need not be returned.


Results will be uploaded live to our website (internet connection permitting) and communicated to all pre-registered participants within 24 hours of the event.


All finishers will receive a Medal on completing the event and, subject to a competitive field of participants, Prizes will be awarded to the top three places overall, and the top place in each of the veteran categories (V40/V50/V60/V70) for both females and males. Winners will be notified via email by the end of the following week where a presentation is not possible on the day.


Marshals will be present on the course throughout the event.


Course Markings, including arrows, tape, buoys and distance markers, will be visible on the course where necessary.




Photography will be provided at this event, a link to which will be communicated to all pre-registered participants within 24 hours of the event.


Suitable Medical Cover will be provided at the event in case of a medical emergency. Participants must provide, during registration, details of any pre-existing medical conditions, disabilities, medication or allergies that may be relevant in the administration of any medical assistance. Participants should also provide the same information on the reverse of their bib number (where applicable) prior to starting the event, marking a large, red X (or other contrasting colour, using the pens provided) to the front of their number to alert the medical provider to any such information.


Bag Drop will not be available at this event. Runners should leave all belongings with their vehicle where possible and arrive ready to run.


Water Stations will be available on the run course only.


Portable Toilets and sanitisation stations will be available around the start/finish/lap point for use throughout the event by both runners and spectators.


Refreshments are expected be available throughout the event from Mr. Brightside, located in the main car park.


There are no dedicated Changing Rooms/Showers at this event.


Lost Property from an event will be kept for one month. If unclaimed, or ownership cannot be determined, lost property items will be donated to charity.


Other Information


As part of our ongoing COVID response, to ensure the opportunities for social distancing are maximised throughout our events, Spectators will not be permitted at this event.


This event is suitable for Wheelchair UsersParticipants wishing to compete with specialised equipment are asked to contact us before entering to ensure we can accommodate any additional requirements.


Noise-cancelling Earphones/Headphones are prohibited and whilst we discourage the use of other earphones/headphones at this event for those competing in running events, participants choosing to use them should ensure they are set to a low enough volume that instructions from marshals and/or other event officials can be clearly understood. We reserve the right to disqualify participants who cannot hear instructions as a result of their use.

The use of Earphones/Headphones is prohibited for all Multisport/Swim participants throughout the event.


Although this event takes place at a private venue, participants should remain vigilant of each other, spectators, marshals and any other persons at all times.


Whilst there is no strict Time-Limit for this event, in order that we adhere to the restrictions imposed by the hire agreement, it may be necessary for us to begin deconstruction of the course and/or start/finish area at approximately 13:30 to facilitate our departure from the premises by the agreed time. Participants will need to be able to complete their event by this time.




For event updates or future promotions, you can find F3 Events on FacebookTwitter and Instagram.


Dorney Lake Christmas Duathlon & Lake Runs Dec 2021

  • 11/12/2021, 08:00

    Duathlon - Super Sprint

    2.5 Kilometres 10 Kilometres 2.5 Kilometres Enter £0.00 - £50.00
  • 11/12/2021, 08:00

    Duathlon - Sprint

    5 Kilometres 20 Kilometres 5 Kilometres Enter £0.00 - £55.00
  • 11/12/2021, 08:00

    Duathlon - Standard

    10 Kilometres 40 Kilometres 5 Kilometres Enter £0.00 - £60.00
  • 11/12/2021, 12:00


    5 Kilometres Enter £0.00 - £20.00
  • 11/12/2021, 12:00


    10 Kilometres Enter £0.00 - £25.00
  • 11/12/2021, 12:00


    15 Kilometres Enter £0.00 - £30.00
  • 11/12/2021, 12:00

    Half Marathon

    13.1 Miles Enter £0.00 - £35.00



For details on planning your journey and available parking facilities, please visit