Outdoor swimming in the UK has seen a remarkable surge in popularity. What was once the preserve of hardy eccentrics has become a mainstream activity embraced by hundreds of thousands of people. The growth has been accompanied by a flourishing events calendar, from competitive open-water races to social wild swims, winter dipping gatherings, and lido festivals. Here is your guide to the best outdoor swimming events across the country.
Major open-water swimming events
The Dart 10K, Devon
The Dart 10K is one of the UK's most popular open-water swimming events, following the River Dart downstream from Totnes to Dittisham in Devon. The event attracts around 2,500 swimmers each September and the course takes advantage of the river's current, making it achievable for competent swimmers who might not manage 10 kilometres in still water. The scenery along the Dart is spectacular, passing through ancient woodland and past riverside villages. Entries typically open in January and sell out within hours.
The Great North Swim, Windermere
Held in the Lake District's largest lake, the Great North Swim offers distances from half a mile to 10 kilometres, making it accessible to a wide range of abilities. The event takes place each June and attracts thousands of participants. Windermere provides a beautiful but bracing setting, and the event is well organised with safety boats, feed stations, and a festival village on shore. The Great Swim series also includes events at other UK locations.
Henley Classic Swim
Swimming in the same stretch of the Thames used for the famous regatta, the Henley Classic offers distances of 2.1 kilometres and 4.2 kilometres each July. The event has a civilised atmosphere with post-swim refreshments and a riverside setting that is quintessentially English. Water quality in the Thames at Henley is generally good, and the event provides an opportunity to swim in one of the country's most iconic stretches of river.
Sea swimming events
Bantham Swoosh, Devon
The Bantham Swoosh is a unique tidal swim through the estuary of the River Avon in South Devon. Swimmers ride the incoming tide for approximately 6 kilometres, making it one of the fastest swims in the UK. The event takes place once a year on a date determined by the tides and typically sells out immediately. The combination of tidal assistance and stunning coastal scenery makes this a bucket-list event for open-water swimmers.
Pier to Pier Swims
Several UK coastal towns host pier-to-pier swimming events. Brighton hosts an annual sea swimming race, and Bournemouth's pier-to-pier swim has been a popular event for years. These events typically cover distances of 1 to 3 kilometres and are open to swimmers of varying abilities, with some offering wetsuit and non-wetsuit categories. Sea swimming events are weather-dependent, and organisers will postpone or adjust courses based on conditions.
Winter and cold water swimming
The cold water swimming community has grown enormously, with year-round dipping now a major social and wellness trend. Several organised events cater to cold water enthusiasts. The UK Cold Water Swimming Championships, held at Tooting Bec Lido in South London each January, is the country's premier competitive cold water event. Swimmers compete in unheated outdoor water at temperatures that can drop below 5 degrees Celsius.
The Serpentine Swimming Club in London's Hyde Park hosts the Peter Pan Cup on Christmas Day, a tradition dating back to 1864. Members swim a 100-yard handicap race in the Serpentine, regardless of temperature. The Christmas Day swim has become one of London's most enduring seasonal traditions, though participation is limited to club members. For ideas about other seasonal activities, our Christmas events guide covers the full range.
Lido events and festivals
The UK's surviving lidos have enjoyed a revival, with restored outdoor pools becoming hubs for swimming communities and events. Tooting Bec Lido, London Fields Lido, and the recently restored Pells Pool in Lewes all host regular swimming events, from galas and time trials to social swims and community gatherings.
Bristol Lido hosts evening swim sessions with poolside dining, combining exercise with a social evening out. Jubilee Pool in Penzance, a stunning Art Deco seawater lido, hosts events throughout its season. Saltdean Lido near Brighton, painstakingly restored after years of campaigning, runs community events and swimming sessions in its Grade II listed pool.
Charity swims
Open-water charity swims provide a way to combine fitness goals with fundraising. The most famous is the annual Cross-Channel swim, but more accessible options include organised charity swims in lakes, rivers, and the sea across the UK. Macmillan Cancer Support, the RNLI, and numerous local charities host open-water swimming events that welcome swimmers of all abilities. These events typically provide safety cover, feeding support, and a structured environment that makes open-water swimming accessible to those who might not venture out independently.
Finding your local wild swimming community
Beyond organised events, the UK has a thriving network of wild swimming groups that meet regularly at rivers, lakes, and coastal spots. The Outdoor Swimming Society is a good starting point, with a map of recommended swim spots and information about local groups. Many areas have informal communities that organise through social media, meeting weekly for early morning or after-work swims.
Safety is paramount in open-water swimming. Never swim alone, always check conditions and water quality, acclimatise gradually to cold water, and know your limits. Wearing a brightly coloured swim cap and using a tow float makes you visible to other water users. For more on staying safe at outdoor events, our safety guide covers the essentials.
Getting started
If you are new to outdoor swimming, starting with a supervised event or joining a local group is the safest approach. Many events offer novice categories or shorter distances specifically designed for first-timers. Lido swimming is an excellent stepping stone between pool swimming and open water, as the water is still and the environment is controlled. Finding events near you is straightforward through swimming organisations' websites and local event listings.
The outdoor swimming calendar runs year-round in the UK, with summer offering the warmest and most accessible events and winter providing the ultimate test for cold water enthusiasts. Whatever your ability and appetite for adventure, there is an outdoor swimming event that will get you into the water.
