Taking racing to the next level...

Dorney Lake Swim

Dorney Lake Swim

Dorney Lake Triathlon

Set at the spectacular, flat and smooth-surfaced Dorney Lake, near Windsor, the course takes onto the lake and around the perimeter of the water for the cycle and run. With fuel and water stations and chip-timed results we tri and make it as easy as possible to get your pacing right, so that you can focus on your race and get the best possible time.

Super fast course - perfect for beginners or intermediates - Anyone can enter this triathlon.


  • Triathlon: Super Sprint, Sprint & Olympic
  • Duathlon: Super Sprint, Sprint & Olympic
  • Aquabike: Super Sprint, Sprint & Olympic
  • Team Time Trial: Olympic
  • Lake Swim: 750m, 1.5k & 3k

Where: Dorney Lake, Eton College Rowing Centre, off Court Lane, Dorney, Windsor, Berkshire. SL4 6FJ. (Please note that this postcode has recently been updated from SL4 6QP but may not have propogated to any satnav software you may be using. Please navigate to Dorney Lake if unsure).

Entry on the Day: Subject to a £5 surcharge (cash only, subject to availability).

Age Requirements: Participants must be aged 18 or over on the day of the race.

Registration: From 07:30 to 08:30. Participants will need to register no later than 30 minutes prior to their wave start time. Transition will be open from 07:00.

Race Packs: For collection at registration on the day only, nothing will be posted. Race packs will contain;

  • An ankle strap/timing chip and swimming cap displaying your race number, to be worn throughout the swim.
  • Number transfers for application to your upper arm.
  • A race number bib and timing chip, to be worn throughout the run/cycle.
  • A smaller race number card and timing chip, to be attached to your bicycle handlebars.
Preparation: Pre-race preparation;
  • Dress for your swim, to include your swim cap, ankle chip and arm transfers.
  • Attach your race number to the top in which you will be running using the safety pins provided, it should be visible at all times.
  • Attach the smaller race number to your bicycle handlebars using the cable-ties provided and rack your bicycle in the transition area.
  • Take your remaining running/cycling kit to the transition area for your pre-race briefing, 15 minutes prior to your wave start time.
Timing: Chip-timed.


Bag Drop: Whilst we recommend bringing as little as possible (surplus to the kit required to compete), you can leave your belongings with us while you race using the tear-off baggage strip on your race number, collecting after you finish by presenting your race number.

Toilets: Toilets will be available at the start/finish area throughout the event at no charge.

Parking: Parking is free for The Race Organiser Dorney Lake Triathlon participants.

Race Marshals: Marshals will be present throughout the cycle/run and water safety crews present on the lake during the swim.

Distance Markers: The cycle/run route will be clearly indicated with arrows, tape and distance markers where necessary.

Water Stations: There will be a water station at each end of the 2.5K out-and-back run route (every 1.25K) at which water will be provided in recyclable plastic cups.

Goody Bag: All runners will receive refreshments and snacks on finishing the race.

Refreshments: Refreshments will be available in the main building throughout the event.

Changing/Showers: Changing and shower facilities will be available at this event.

Lost Property: 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.


Results: Results will be uploaded live to our website (internet connection permitting) and, where possible/practical, timing print-outs will be available at the event. In all cases, results will be communicated to all pre-registered participants within 24 hours of the event.

Medals: All finishers will receive a medal on completing the race.