2025 Swim Serpentine

Take the plunge this September by swimming in one of London's most famous lakes in a one-day open water swimming festival - Swim Serpentine!

Location: London

Challenge Level:

Distance: 1 mile or 2 mile

Booking Fee: £20 + booking fee / £25 plus transaction fee

Fundraising Goal: £200/£300

When: 20 September 2025 - 20 September 2025

Register Online

Take on the 2025 Swim Serpentine

Leukaemia Care charity places are available for the 2025 Swim Serpentine challenges.Take the plunge this September by swimming in one of London’s most famous lakes in a one-day open water swimming festival organised by London Marathon Events and staged in the Serpentine, Hyde Park. Choose from the classic 1-mile swim or 2-mile swim.

Swim Serpentine 1 mile event

The details

Date: 20th September 2025
Distance: 1 mile event (Olympic distance)
Booking fee: £20 plus transaction fee
Fundraising goal: £200

Sign up here

Swim Serpentine 2 mile event

The details

Date: 20th September 2025
Distance: 2 mile event (136 lengths)
Booking fee: £25 plus transaction fee
Fundraising goal: £300

Sign up here

The London Classics Medal

Have you already taken on the London Marathon and RideLondon? By completing the Swim Serpentine two mile-swim will allow you to claim a London Classic’s medal. You can join the elite club of people who have run, cycled and swam the capital’s most famous mass participation events!

If you’d like to find out more about this event, simply email events@leukaemiacare.org.uk or call 01905 755 977.

Please ensure you read the event terms and conditions before signing up.

Got your own place?

We will refund you up to £500 towards the cost of your place if you take part and fundraise for Leukaemia Care! Check out our terms and conditions for more information here.

Register Online

Are you interested in organising an event?

After experiencing recurring chest pains, David Nutt visited his GP and had a blood test taken. When the blood test came back with a diagnosis of chronic myeloid leukaemia (CML), David and his family were shocked.

Read More