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SwimGrafham 5km finisher
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An Open Water Adventure


An Open Water Adventure


An incredible open water adventure back for 2024

Swim across Grafham Water in Cambridgeshire

Entries now open for Summer 2024

SwimGrafham: 28/07/2024

Grafham Water: Cambridgeshire

Distances: 1km, 2km, 3km or 5km

Start time: 7:00am

Off the water: 10:00am 

Entry fee: £32.00 - £55.00

Entry includes:

Silicone swim hat

Finisher Medal

Chip timing

Advanced medical support 

Comprehensive safety cover

Free event photos

Free swim float hire


An epic course

 It will be a stunning achievement to swim these routes.

We wanted this to be an adventure.

2km out and back, north shore to south shore (dark green)

3km triangular course taking you on an adventure to the Dam and water tower (light green)

The course is big, exposed and extremely exciting. We're here with the team to keep you safe and ensure you have a great experience.

Conquer Grafham Water with us.

SwimGrafham Map

Swim Distance Options

1km - The perfect starter swim challenge. £32

Experience the thrill of this open water swim course in a manageable distance, 

All welcome, no experience necessary, age 14 and above. 

2km - Swim across the heart of the lake. £42

The 2km course goes from the north shore, to the south shore of the lake and back.

You really get to experience the full size and scale of Grafham water from this amazing perspective.

3km - Explore the reservoir. £47

The 3km swimmers get to swim the triangular course which takes in the water tower, dam, south shore and north shore. It's an epic adventure. 

5km - Both courses combined. £55

Considered the half marathon distance for open water swimmers.

A monster swim with a full passage of the triangle course followed by the north to south shore route. 

Cut off times

1km - 1 hour to complete your swim.

2km - 2 hours to complete your swim

3km - 2 hours to complete your swim

5km - 3 hours to complete your swim

*3km and 5km athletes have a rolling cut off for the first 2km due to safety provision. You must keep pace.

3km = 4:00mins/100m average pace = 40 mins per km. You must reach the 2km point within 1hr 20 mins. 

5km athletes must average 36 mins per km to complete the full 5km distance in 3 hours. Those in the 5km missing the 3 hr cut off will be ranked in the 3km competition.

SwimGrafham open water swimmers



Please note the temperature ranges before entering the event. 

15.9c and under = wetsuit compulsory
16c and above = wetsuit optional in all distances
23c = Advisory Non-wetsuit for 3km
24c = Advisory Non-wetsuit for 5km


If the water temperature does not reach 16.1c, this will be a wetsuit compulsory event. Please consider this when entering. There will be no transfers or refunds made because of the wetsuit policy. 


The upper limit is discretional. We advise that you don't wear a wetsuit above these temperatures but acknowledge not everyone is here to swim as fast as possible and might require the extra warmth.

The policy has been agreed with the lake owners using industry best practice and our collective knowledge of the venue. Temperatures will be adhered to; no exceptions will be made. Unfortunately, we cannot make additional allowances for experience or preference. We appreciate your continued understanding.


Swim floats are compulsory for this event 

They are designed to make you visible without impeding your natural swimming stroke.

We loan our swim floats for free to all competitors. No need to book, no need to make any arrangements.

They will be ready to collect on the morning of SwimGrafham if you would like to use one. 

We believe that they offer our swimmers the best possible safety during our event.  

swim floats

How to Find Us

Grafham Water Visitor Centre

Buckden road

Marlow Park



PE28 0BH

Please follow event signs from the main road.

Contact Us

Please note; we might be more difficult to contact during race week.

Mark all urgent enquiries with URGENT SwimGrafham in the title and we will get back to you as soon as possible. 

Pacesetter Swim events map.jpg

Proudly recommending local experts

Swim Cube logo

Swim Cube is an independent business but we're very happy to recommend their services. 

They host a weekly training swim throughout the summer at Grafham and Pitsford Water which is the perfect environment to get used to open water swimming and train for SwimGrafham (or any other swim you might be taking part in).

Please follow the links for more details.

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