

An Open Water Adventure
Suffolk
08/06/2025
An open water adventure at Alton water in Suffolk
SwimAlton is an adventure around Alton Water in Suffolk.
SwimAlton: 08/06/2025
Alton Water: Ipswich, Suffolk
Distances: 1/2 Mile, 1 Mile, 2 Miles, 5km
Includes a 10km
Start time: From 7:00am
Cut Off: 11:00am
Entry fee: From £25.00
Entry includes:
SwimAlton Finisher Medal
Silicone swim hat
Chip timing
Advanced medical support
Comprehensive safety cover
Free event photos
Swim float hire
Course Details
The course is an adventure around the heart of Alton water in Suffolk. A beach start leading to a long exposed reach across the widest section of the reservoir. We incorporate the water tower and the Dam before turning back and heading to a beach finish and a warm welcome.
The course is full of features and points of interest. We welcome swimmers to challenge themselves with pace or distance offering a nice range of options. 1/2 mile, 1 mile, 2 miles or 5km swims are open to athletes.

Early Bird Entry Prices
SwimAlton 1/2 Mile
The perfect place to start - £25
An out and back, keeping things close to the shore. Great for building your confidence in open water.
SwimAlton 1 Mile
An adventure for everyone - £38
A complete loop of the SwimAlton course. With some fantastic landmarks along the way.
SwimAlton 2 Miles
The adventure doubled - £42
Enjoy the course and increase the distance. You get to enjoy the course twice and challenge your endurance.
SwimAlton 5km
Open water Half Marathon - £48
A huge benchmark in open water swimming, considered the Half Marathon. 3hrs to try!
SwimAlton 10km
Open water Marathon - £65
A huge benchmark in open water swimming, 4 hours to complete your 10km swim supported by SwimAlton throughout!

#SwimAlton
Wetsuits
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 2 miles
24c = Advisory Non-wetsuit for 5km
If the water temperature does not reach 16c, 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.
SwimFloats
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 SwimAlton if you would like to use one.
We believe that they offer our swimmers the best possible safety during our event.

How to Find Us
Event parking is located in the overflow car park on the entrance to the site. *Anglian Water parking charges apply
Alton Water Reservoir
Alton
Suffolk
IP9 2RY
Follow event signs from the access road where our team will on site to assist with parking safely.
The swim site is a small walk down the hill from the parking area.
Contact Us
Please note; we might be more difficult to contact during race week.
Mark all urgent enquiries with URGENT SwimAlton in the title and we will get back to you as soon as possible.

Timetable (provisional)
Alton Water site open 5:45am
Registration open 6:00am
Bag drop check in open 6:30am
Registration closed 8:30am
Bag drop check in closed 8:45am
10km swim start 7:00am Pink Hats
5km swim start 8:00am Yellow Hats
2 mile swim start 8:15am White Hats
1 mile swim start 8:30am Blue Hats
½ mile swim start 9:00am Red Hats
Final lap cut off 10:36am
Cut off time – all swimmers 11:00am
Prize giving As soon as possible once podium positions are confirmed in each distance.