Dorney Lake : 5km, 10km, 15km, Half Marathon

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Bring out your best marathon by preparing thoroughly for your big race day. Our Marathon Prep offers the perfect race day rehearsal and long run training in one event with options for 16, 20 or 24 mile distances.Scheduled 4 weeks before the Virgin Money London Marathon and conveniently before other major marathon events, both in the UK and internationally, we'll provide the ideal conditions to practice your pacing, fuelling and endurance amongst hundreds of other runners to help you head into your marathon feeling prepared and confident.
20 Miles, 16 Miles, and 24 Miles
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Sat, 5 Sept 2020
View logistics
Dorney, United Kingdom
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(7 Reviews)
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Based on 650 participants


<5m elevation gain per km

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Where and when
Dorney Lake, Court Ln, Dorney, Windsor SL4 6QP, UK
Start times
Sat, 5 Sept 2020
24 Miles:
9:30am |
20 Miles:
9:30am |
16 Miles:
Races summary
Here's what races are available for Dorney Lake : 5km, 10km, 15km, Half Marathon
24 Miles
£23.00 - £25.00
20 Miles
£23.00 - £25.00
16 Miles
£23.00 - £25.00
Route information
This mixed-distance event is set at the stunning Dorney Lake, just outside of Windsor. The course will spans right along the waters edge and loops around the circumference of this iconic Olympic venue.
Given the completely flat nature of the course, this is the perfect opportunity to smash your PB. Take inspiration from Team GB's London 2012 success and sign up for this epic event.
The course will be well marshalled and clearly distance marked throughout, with a number of refreshment stations to keep hydrated.
This event will have pacers for the first 20 miles, running at marathon speeds of between 2hrs 45mins and 5hrs 30 mins.
Details of individual races can be found below:
16 mile - 4 laps
20 mile - 5 laps
24 mile - 6 laps
What's included
  • Chip-timed event
  • Course marshalled
  • Distance markers
  • Refreshment stations
  • Post-race snacks
  • Race pacers
How to get there
Dorney Lake, Court Ln, Dorney, Windsor SL4 6QP, UK
Get full directionsExternalLink
**Address: Dorney Lake, Eton College Rowing Centre, Court Lane, Dorney, Windsor, Berkshire SL4 6QP
Car:** Dorney Lake is easily reachable from London. If you are coming along the M4 then take the exit at Junction 7. There are two Pay & Display carparks available on-site for visitors.
Train: The closest railway stations are Slough and Windsor & Eton Riverside. Both of which are approximately a 20 minute drive away.
Event day logistics
0800 - 0915: Registration process
0930: Race starts
Race packs will be collected on the day. Please arrive at least 45 minutes before the start of the race to allow plenty time for the registration process.
The Race Organiser's logo
The Race Organiser
With an inventory of over 150 events each year, the Race Organiser is one of the most prominent event organisers in the country. Whether it’s running, cycling, or swimming events, TRO have succeeded in creating a community of all abilities, who come together time-and-time again to enjoy their shared passion. Their events are widely renowned for exceptional organisation and great marshals who will ensure that you have a truly amazing experience come race day.
View more The Race Organiser eventsExternalLink
Spectator Info
Spectators are strongly encouraged to come along and attempt to recreate the epic atmosphere of the London 2012 Olympic Games.
The looped nature of the course allows supporters to catch numerous glimpses of the runners in their Olympic backdrop.
Does this event have a time-limit?
The Race Organiser have agreed a cut-off time of 4 hours with Dorney Lake. As such, please select a distance that you can complete in this time, details can be found below: 16 Mile - 15 minute miles, 20 Mile - 12 minute miles, 24 Mile - 10 minute miles
Are there changing/shower facilities?
Dorney Lake will provide both changing and shower facilities on-site.
Can I leave baggage at the start?
Belongings can be left with the Race Organiser. However, in the interest of space, please bring as little extra baggage as possible.
7 reviews
Did the 24 Miles in 2018
I've been to this event several times and for good reason! Its just racing pure and simple. Its a good course, although I did get a puncher half way round which was bum out. So maybe watch your tyres!
Did the 16 Miles in 2018
Its a very long way! I hadn;t trained and I found this quite tough. Lovely support from the fans and the volunteers got me through
Did the 24 Miles in 2019
I LOVE Dorney Lake. Running around here is so nice and flat with such a lovely breeze to keep you cool. One of my fav places to race!
Did the 16 Miles in 2018
Good course, good fun and a good atmosphere, couldnt really tell what was going on with the timings, just needed to be a bit clearer
Did the 16 Miles in 2018
I mean the course is actually great, the problem is that its just a bit dull for my taste. And was quite windy and cold for that time of year
Did the 20 Miles in 2019
Really well organised - great having the marathon target time pacers, which worked very well for me. Didn't hate the laps as much as I thought I would! A great race to prepare for an upcoming marathon - thank you.
Did the 16 Miles in 2017
Remember to breath in through the nose, due to taking in protein from eating too many midges.
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