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Tickets £25–£42

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Distances in this event

  1. Two-Mile

    Swim 2mi
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  2. One-Mile

    Swim 1mi
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  3. Half-Mile

    Swim 0.5mi
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Swim Serpentine routes


Half-Mile Swim: This is a half lap of the Serpentine. Perfect for those after a fast and furious race, as well as those looking for a shorter, more manageable (but still tough!) swim.

One-Mile Swim: The classic distance. This is easily the most popular race of the festival, consisting of one lap around the lake.

Two-Mile Swim: A more challenging swim for those who want one, this is two laps around the lake. Aimed at those with previous One Mile swim expereince who want to really test themselves.

Event details

  • Finisher’s medal
  • 6000 participants

From the organizer

Organizer leaderboard ranking badge


London Marathon Events are ranked #53 in the UK out of 505 organizers

Children with Cancer UK Swim Serpentine is a one-day open water swimming festival staged in the heart of London. Organised by London Marathon Events, the festival is held in and around the beautiful Serpentine in Hyde Park, the venue for the open water swimming competition at the London 2012 Olympic Games. Children with Cancer UK Swim Serpentine is already a must-do event in the open water swimming calendar.

The event offers a safe, inclusive environment for swimmers of all abilities, who we look forward to welcoming to the Serpentine in September.

What’s Included
  • Medal for all finishers
  • Swim Pack with coloured swim cap and more
  • Heated changing rooms
  • Dunk zone
  • Pontoon start and finish
  • Full water safety crew
  • Hot tubs
  • Exhibition area.
Raceday Logistics


All participants will receive a Swim Pack before the event.


Half Mile - 08:30

One Mile (Women Only) - 09:00

Two Mile - 09:35

Two Mile - 10:30

One Mile - 11:25

Two Mile - 11:55

Two Mile - 12:50

One Mile - 13:45

Two Mile - 14:15

Two Mile - 15:10

One Mile - 16:05

One Mile - 16:35


We welcome para swimmers and swimmers with a disability at Children with Cancer UK Swim Serpentine. There is not a dedicated para swimmers wave so you will be able to choose which wave you enter when you sign up. If you require help or support on event day, please contact [email protected]
Kit List

Wearing a wetsuit or using a tow-float

Everyone who takes part in Children with Cancer UK Swim Serpentine events must either wear a full length wetsuit or use a tow-float for safety reasons.

If the temperature of the water in the Serpentine is 15°C or above, wetsuits are optional at Children with Cancer UK Swim Serpentine. If you choose not to wear a wetsuit, you must use a tow-float.

If the water temperature is under 15°C, wetsuits are compulsory.

Swim Cap

Swim Cap (which displays your start wave colour)

There will be a real festival atmosphere in Hyde Park throughout the weekend, so spectators are encourage to come along and watch. The event area will feature grandstands for even better viewing, while there will be plenty of additional entertainment for the whole family.

Frequently Asked Questions

Can you sign up for the Swim Serpentine on the day?
No. Signups are ending on September 5th!
Is the Swim Serpentine family-friendly?
Yes! The minimum age for the half mile swim is 12 years old and the minimum age for the one mile swim is 16.
What so cool about this race?
The one mile swim follows the same course as the London 2012 Marathon Swimming Olympic Event.
Have a question? Get answers from our team.

Swim Serpentine weather forecast

Mostly cloudy throughout the day.

Predicted highs
Predicted lows
IconLight breeze possible, up to 9mph

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