By using this website you agree to our cookie policy
Need training help? Get a free training plan

Swim Serpentine

Top tags:

Stunning scenery

Friendly atmosphere

Incredible crowds

Get race results and photos

This event has passed. Congratulations to all the participants. Get race results and photos.

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.

Review summary

6 Reviews
  • Course
  • Organisation
  • Atmosphere


Sue P
"Really well organised, buzzing atmosphere! Good selection of after swim snacks..."


dave f
"I loved this event I only starting swimming properly less than 3 yrs ago and..."


Lynda C
"I do this every year and really enjoy it. It is easy to get to, well organised..."
See all reviews

How to enter the Swim Serpentine

  1. Two-Mile

    Swim 2mi
    Event passed
  2. One-Mile

    Swim 1mi
    Event passed
  3. Half-Mile

    Swim 0.5mi
    Event passed

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

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

Possible light rain overnight.

Predicted highs
Predicted lows
IconLight breeze possible, up to 8mph

Meet the organizer

Organizer leaderboard ranking badge


London Marathon Events are ranked #47 in the UK out of 564 organizers

The London Marathon (currently known through sponsorship as the Virgin Money London Marathon) is a long-distance running event held in London, United Kingdom, part of the World Marathon Majors. The event was first run on 29 March 1981 and has been held in the spring of every year since. Since 2010, the race has been sponsored by Virgin Money.

Swim Serpentine reviews (6)

4.8 out of 5 stars

  • Course
  • Organisation
  • Atmosphere

Reasons people recommend this event

Stunning scenery

Friendly atmosphere

Incredible crowds

  • Did the Two-Mile in 2019

    I loved this event I only starting swimming properly less than 3 yrs ago and only really started swimming open water in April 2019
    This was my biggest sporting challenge ever and for me my scariest but once at the event my nerves began to ease a little seeing all the other competitors and once in the water it was great. My only small criticism would be that there was no where to fill my water bottle other than that a brilliant event
  • Did the One-Mile in 2019

    I do this every year and really enjoy it. It is easy to get to, well organised and has great changing facilities. Really enjoyed the staggered start this year that avoids the start bun fight. Will do it again next year and encourage others to do it also.
  • Did the Two-Mile in 2019

    Only disappointment for me was on second lap next wave started and I was caught in group of aggressive swimmers, who gave little thought towards the safety of other swimmers.
    To me I accept that everyone swims at a different pace but any slower swimmers I approached, I always tried to ensure that I gave them sufficient space when swimming past them, not over the top of them.
  • Did the Two-Mile in 2019

    Brilliant. Well organised. Great swim. good flow of competitors. Nice touch with the hot tubs. Thoroughly enjoyed it!
  • Did the Two-Mile in 2019

    This was a well organised event, great setting in Hyde Park, weather was beautiful and overall a fun, and Friendly bucket list event.
  • Did the One-Mile in 2019

    Really well organised, buzzing atmosphere! Good selection of after swim snacks and lovely warm changing room :-)