The All Nations Triathlon, 5K, 10K and Half Marathon Run
Sat 9 May 2026 Windsor, Buckinghamshire, UK

The All Nations Triathlon, 5K, 10K and Half Marathon Run

Delve into an action-packed day of multisport racing, featuring an inclusive Super Sprint Triathlon, 5K, 10K and Half Marathon distances for all abilities at the stunning Olympic venue!

4 races

  • Sat 9 May
  • #1 of 4
Dorney Lake, Windsor

5K

08:45

Age 11 & over

£25-£30

  • 5 km road running
  • Sat 9 May
  • #2 of 4
Dorney Lake, Windsor

10K

08:45

Age 15 & over

£25-£30

  • 10 km road running
  • Sat 9 May
  • #3 of 4
Dorney Lake, Windsor

Half Marathon

08:15

Age 17 & over

£30-£35

  • 13.1 miles road running
  • Sat 9 May
  • #4 of 4
Dorney Lake, Windsor

The All Nations Triathlon

10:15

Age 15 & over

£60

  • 400 m pool swimming
  • 20 km road cycling
  • 5 km road running

Event overview

Experience a vibrant day of outdoor racing that brings athletes together across multiple disciplines, from a fast, exciting super sprint triathlon to classic road running distances.

Whether you’re new to multisport or chasing a personal best, choose your challenge with 5K, 10K or half marathon races in an energetic, supportive event atmosphere.

Highlights

  • Multiple race options in one day, from a super sprint triathlon to a half marathon
  • Ideal for first-timers, club athletes and experienced racers alike
  • Well-organised, friendly event with a supportive atmosphere throughout
  • Opportunity to race, spectate or cheer across several disciplines
  • Clearly structured schedule making it easy to plan your race day
  • Finisher medals and race-day rewards across all events
  • A celebration of multisport and running, bringing athletes together at the famous Olympic venue

Event video

Event community

0h 57m
Peter O.

Peter O.

  • Average fitness
  • Beginner-friendly
  • Dogs allowed at venue
  • Event village
  • Families
  • Spectators
  • Venue accessible

Timetable

  • 07:15-07:45 | Recommended arrival time
  • 08:15 | Half Marathon
  • 08:45 | 5K and 10K
  • 09:45 | Bikes must be racked by this time
  • 10:15 | Triathlon events begin

Team entries

Get as many friends, family or colleagues together and take part as a team. You are not required to stay together and each person will receive their own time however it's just fun to participate under a team name.

Wheelchairs

The routes are suitable for wheelchair users.

Dogs

Dogs may run with their owners in the 5K, 10K or Half Marathon running events but not the triathlon events. Please ensure your dog is on a short lead/harness and that you are careful on the course and respect other runners and park users.

  • Cafe
  • Changing facilities
  • Free parking
  • Park
  • Secure bag storage
  • Showers
  • Toilets

Event HQ

Dorney Lake
Off Court Lane, Lake End Road
Windsor
Buckinghamshire
SL4 6FJ
UK

Parking

Parking is the main carparking by the clubhouse. This is to the left when you get to the end of the lake.

By rail

If travelling by train the main stations for Dorney Lake are Slough (Paddington line) and Windsor and Eton Riverside (from Waterloo) but is also near Burnham, Taplow, Maidenhead and Windsor and Eton Central (branch of Paddington line). From these stations you can get a taxi, or if you have a bike, you can ride to the venue. 

Well here it was – the first triathlon race of the season for me. This is now the second time I have taken part in this event and I can see it becoming the first event and a regular thing for me each season. Danny M

Good event in a fantastic location (2012 Olympic site), cold water but perfect TRI courses for beginners as it is flat for the bike and running parts. Had a great day and will probably do it again next year... Patrice B

First time for me in open water. Easy access to water and a good transition zone, but a bit boring with the 4 bike loop, nice and flat run. Brian R

Reviews thanks to RaceCheck

Races at event

  • Sat 9 May
  • #1 of 4
Dorney Lake, Windsor
5K

08:45

Age 11 & over

£25-£30

  • 5 km road running
  • Sat 9 May
  • #2 of 4
Dorney Lake, Windsor
10K

08:45

Age 15 & over

£25-£30

  • 10 km road running
  • Sat 9 May
  • #3 of 4
Dorney Lake, Windsor
Half Marathon

08:15

Age 17 & over

£30-£35

  • 13.1 miles road running
  • Sat 9 May
  • #4 of 4
Dorney Lake, Windsor
The All Nations Triathlon

10:15

Age 15 & over

£60

  • 400 m pool swimming
  • 20 km road cycling
  • 5 km road running

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