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Join us for the Dorney Triathlon!

Take on a Sprint or Standard Distance Triathlon around Dorney Lake, and take the opportunity to race around this unique and inspiring Olympic venue!

Come and enjoy the day with us. We hope to see you there!

Review summary

6 Reviews
  • Course
  • Organisation
  • Atmosphere


Andrew O
"Everything was perfect apart from the wind! Very well organised, fantastic..."


geoff n
"Been to several events at Dorney...this probably amongst the..."


Matt M
"A great day with a fun course. Excellent for getting a PB and very well..."
See all reviews

How to enter the Dorney Triathlon

  1. Sprint Triathlon

    Triathlon: Swim 0.75km, Bike 20km, Run 5km
    Event passed
  2. Olympic Triathlon

    Triathlon: Swim 1.5km, Bike 40km, Run 10km
    Event passed

Dorney Triathlon routes

The purpose-built lake is perfect for the swim and the flat grounds lend themselves to a totally flat bike and run course, the ideal venue for a chip-timed PB. Each discipline will be accurately marked out with distance flags and we will have plenty of helpers to keep you on track and encourage you all the way to the finish.


The route is clockwise. The course will be well marked with swim buoys and you will complete 1 lap for the sprint distance and 2 laps for the standard distance. After completing your correct number of laps, you will head for the swim exit marked by flags.


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.


Starting from the transition area, triathletes will run either 1 or 2 out and back loops, alongside the lake. The course is on pavements and is completely flat.

Event Details

What’s Included
Chip-timed results

Unique themed medal

Free official event photos

Fruit & flapjacks
Raceday Logistics



You will be guided to the side of the lake at the swim start, straight after the race briefing.

You will be asked to enter the water and line up at or behind the start line. The swim will start in the water.

The start will be prompt, to provide the most accurate times for you.

The temperature of the lake is taken on the morning of the event, and if it is over 14 degrees then wetsuits will be optional. If the temperature is over 22 degrees then wetsuits will not be allowed. Please don’t email us if wetsuits will be allowed at the race, as we can’t tell you this information until the temperature is taken on race day.

If you have any recent exposed cuts or feel unwell, you are advised not to take part.

If you get into any sort of difficulty, roll onto your back and raise one arm directly upwards out of the water. This will prompt a lifeguard in a kayak to either rescue or attend to you out in the open water.


After securing your cycle helmet in the transition area (this must be done before un-racking your bike), proceed on foot to the mount point, where you must wait until it is clear to start the bike course.

You must ensure you mount and dismount correctly (i.e. after the mount line and before the dismount line), and failure to do so will result in a time penalty!


There will be 1 drinks station on the course, manned by marshals serving water in plastic cups. This is the only drinks station and you will pass it on each lap.


After the race, no bikes can be removed from transition until the last cyclist has returned in your wave. Your number must be presented to remove your bike. There will be no exception to this!


More information about race day and your race pack will be made available closer to the event.

Race Rules:

Normal BTF (British Triathlon Federation) rules apply. All these rules are important but the most important of these is that all competitors must secure their cycle helmet (on their heads!) before removing their bike from the rack and must not undo or remove it before racking their bike at the end of the cycle section.

You must also fully comply with and follow all rules of the Highway Code. Our primary consideration is your safety, make it yours as well!


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


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


Event Chip Timing will record your times, and results will be live at throughout and after the race.

Prizes/Presentation :

The presentation of prizes will take place throughout the morning and we’ll make announcements prior to the presentation. There are lots of prizes on offer!


We will have a photographer taking a few snaps of the race and they will be on our Facebook page afterwards, so be sure to check it out and see if you can spot yourself.

Kit List

Swim hats are compulsory and will be provided.

As mentioned, the temperature of the lake is taken on the morning of the event, and if it is over 14 degrees then wetsuits will be optional. If the temperature is over 22 degrees then wetsuits will not be allowed.

Helmets are compulsory for the bike section.

Spectators are free to wander around the lake, so you can see where the competitors will be running. The course is lapped so you will see them on numerous occasions!

Can I take part for charity?

We are working in partnership with Run for Charity. Whether you have a charity in mind, or would like our help, you can have a look around and find the charity you’d like to support. Run for Charity will support you every step of the way and give you that bit extra to make sure you become a hero on race day!

If you haven’t found a charity that you're looking for, don’t worry! We work with over 450 charities in the UK, and will do our best to match you with a cause that is close to your heart. Please email [email protected] for more information.

Dorney Triathlon weather forecast

Windy in the morning and afternoon.

Predicted highs
Predicted lows
Icon70% chance of rain
IconModerate wind possible, up to 21mph

Meet the organiser

RunThrough are a running community-based in London, inspired & led by a small passionate group of running geeks. We organize events all over the UK’s capital and the North West of England.



Dorney Triathlon reviews (6)

4.7 out of 5 stars

  • Course
  • Organisation
  • Atmosphere
  • G

    Geoff n

    Did the Sprint Triathlon in 2019

    Been to several events at Dorney...this probably amongst the "friendliest"...all abilities made to feel very welcome...nice to bike on a traffic-free course.
  • M

    Matt M

    Did the Olympic Triathlon in 2019

    A great day with a fun course. Excellent for getting a PB and very well organized with good timing. Very friendly competitors and staff. My favourite place to race.
  • A

    Andrew O

    Did the Olympic Triathlon in 2019

    Everything was perfect apart from the wind! Very well organised, fantastic course and event area and not too many competitors. Made for a 10yr PB so chuffed to bits! Great job to all involved, see you next year!
  • K


    Did the Olympic Triathlon in 2019

    Well organised team. Friendly atmosphere. Good for family to attend and support. I will race at venue with organiser again.
  • P

    Pam S

    Did the Olympic Triathlon in 2019

    Very enjoyable, despite an evil cross-wind. The course is quite exposed, but in favourable conditions, ideal for a PB. Very friendly.
  • D


    Did the Sprint Triathlon in 2019

    I've done this race a few years in a row now and always enjoy it. It has a friendly laid back atmosphere, which you might not expect from a very fast course which I'm sure a lot of people use to try and set PBs. It caters well for all levels, with a wide swim start, a bike course where overtaking is easy, and a nice there and back run. All the volunteers were exceptionally smiley and friendly. The early start was good this year as it meant the worst of the wind was avoided, but if you're not a morning person this might not be the best event, as you have to arrive around 6am.
    Overall, a really great event!
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