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Dorney Triathlon (plus 5K, 10K, and Half)

Sat 8th Jun 2019
Dorney Lake, Dorney Lake, Windsor SL4, UK
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  • Undulating
  • Finisher’s medal
  • 1000 participants

From the organizer

Organizer's website

We are excited to announce the return of Dorney Triathlon in 2019. Join us at Dorney Lake; home to London 2012s rowing and canoeing events for a sprint or standard distance triathlon. The purpose built lake is perfect for the swim and the flat grounds lend themselves to a totally flat bike and run course, ideal for chasing down a new personal best!

Distances in this event

  1. Olympic Triathlon

    Triathlon: Swim 1.5km, Bike 40km, Run 10km
    7:00am Sat 8th Jun 2019
    Event passed
  2. Sprint Triathlon

    Triathlon: Swim 0.75km, Bike 20km, Run 5km
    7:00am Sat 8th Jun 2019
    Event passed
  3. Half Marathon

    Run 21.1km
    10:00am Sat 8th Jun 2019
    Event passed
  4. 10K

    Run 10km
    10:45am Sat 8th Jun 2019
    Event passed
  5. 5K

    Run 5km
    10:45am Sat 8th Jun 2019
    Event passed
Course Maps

What’s Included
  • Chip timed results
  • Unique themed medal
  • Free official event photos
  • Fruit & Flapjacks
  • Event T-shirt included with both triathlons, available for £10 with the other races
Course Details


The Swim -

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 Bike Ride -

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.

The Run -

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

Raceday Logistics

Start Times

10:00 am - Half Marathon
10:45 am - 5K & 10K


Dorney Lake, Off Court Lane, Windsor, Berks, SL4 6QP

Dorney Lake is ideally placed being within easy reach of London, Heathrow Airport, the M4 corridor and the M3, M25 and M40 motorways. It is well served by the rail network with main stations being Slough, Maidenhead and Windsor. Taplow and Burnham train stations are also nearby.

There will be free parking for all participants next to the event village and start and finish!


  • Exit at Junction 7 follow slip road to roundabout
  • Turn left onto A4 towards Maidenhead
  • After traffic lights turn left at roundabout onto B3026, signposted for Dorney and Eton
  • On sharp left-hand bend, turn right, signposted Dorney Reach
  • After 400m enter Dorney Lake, Eton College Rowing Centre through large white double gates
  • Follow perimeter road to left of lake down to the boathouse


Main stations for Dorney Lake are Slough and Windsor & Eton Riverside.  Burnham, Taplow and Maidenhead stations are also nearby.

Kit List


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


You are free to wander around the lake so you can see where the competitors will be running. It is lapped so you will see them on numerous occasions.


No volunteers needed :)


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!

The Half Marathon course has a strict 3-hour time limit!

View on a map

Reviews (5)

4.7 out of 5 stars

  • Course
  • Organisation
  • Atmosphere
  • Did the Sprint Triathlon in 2018

    Really enjoyable, good venue, easy to get to, close transitions and very flat so PB friendly
  • Did the event in 2013

    Very enjoyable run and everything was organised well. It would be nice if there was another water station possibly 2 more. Otherwise everything was well organised, and staff were very helpful.
  • Did the event in 2018

    The race was managed very well except there could have been another water station at the other end of the lake... it was very hot and there is no shade so an extra drink would of helped.Thanks
  • Did the event in 2018

    Excellent race, really well organised and great atmosphere. Lovely scenic setting and totally flat Course! Also great to go to a race where you then also dont have to pay more to park and there arent annoying rules about using headphones.10/10 and look forward to doing it again :)
  • Did the Olympic Triathlon in 2018

    Really excellent event. This was my first standard distance tri and as a beginner I really appreciated the simple layout. I can also appreciate the more experienced triathlete would like that it's an opportunity to push pace and times.

Questions & answers

Get answers from our team or a member of our dedicated community.

What would you like to know about this event?
  • G

    Greg W14th Mar
    Hi There, is the 8th of June sold out?


    Steph E14th Mar
    Hi there, not sold out yet so you can still book on!
  • G

    Greg W18th Mar
    Think I am not going through to the correct link but it keeps saying 8th September when trying to book 8th of June.


    Steph E18th Mar
    Hi there. Apologies for the confusion - the link has now been updated. Enjoy the event!
  • D

    Debbie C22nd Apr
    Is there a time limit on the Sprint Triathlon? More concerned with how long it will take for the swim rather than cycle or run. Thanks, Debbie


    Steph E24th Apr
    Hey there, just to let you know that there is not specific time limit for this event. All the best!
  • S

    Satyam N4th Jun
    Hi there, I just applied for the half marathon yesterday? Was wondering when I would hear about the race packs? Thanks


    Steph E4th Jun
    Hey there, just to let you know that you need to collect your numbers on the morning of the race. Registration is 8:30am – 9:30am (Half Marathon) and 9:00am – 10:15am (5k & 10k). It will take around 15 minutes to collect your number and drop your bag off. The earlier you get there, the more efficient we will be on the day. All the best!

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