OSS swims aren't quite like other swims; we're all about the people, and the journey

Jess Rose

Start the season in July with a weekend at the beach and a sandy bottomed swim with a Swoosh to finish, build up over summer for a Dart 10k marathon through the green hills of Devon, and then welcome in autumn with the Hurly Burly, possibly the world’s fastest 10k, with winds, weather and fire pits in North Wales.


3rd July 2020

Bantham, Devon

How far can you swim before the tide turns? The Bantham Boomerang swim is a new swim for 2020: a 7-10km swim on the Avon Estuary in Devon, taking place on a Friday afternoon with a BBQ afterwards. The distance swum will depend on how fast you swim, but all swim speeds are welcome. Swimmers will be set off according to their speed, which you are asked to know by the day. Some swimmers will make it all the way to the turnaround pontoon around 6km upstream before the tide turns, others will have a shorter journey. Our fantastic safety team will be there to support you every step of the way.



4th July 2020

Tim Bridges

Bantham, Devon

The Sunrise Swoosh is a gentle 6km swim down the Avon Estuary, with a “swoosh” at the end. Swimmers are invited to join us in 2020 for an early morning dip, making their way to Bantham Beach as the sun rises. Once again, we will have pasties and pints, and the perfect beach location for a weekend with friends or family. A great swim to start the season: water is typically 14-17°C, and swimmers usually take between 90 minutes and 2 hours to complete the swim.

Sunrise Swoosh standard swim entries and charity entries are now sold out. MiniSwoosh tickets are now available through the Sunrise Swoosh event page (link below).



5th – 6th September 2020 

Graham Wynne

Totnes and Dittisham, Devon

A spectacular swim starting in Totnes in Devon and winding its way around the Sharpham Bends to the sailing village of Dittisham (dit-sum to locals). It has it all: adventure, joy and challenge. At the end there’s a festival field with hot tubs, wood fired pizza, deck chairs, local beers, a playground, and lots of other lovely treats to celebrate our biggest event. Wherever you are on the swim spectrum right now, put enough determination, lessons and training into picking up strength, style and stamina, and you can probably do it.



19th September 2020

Jess Rose

Barmouth/Abermaw, North Wales

Tidal assistance at its finest (fast enough it’s almost into the bore category). Hot chocolate, wood fired hot tubs and fire pits greet all swimmers, runners and run-swimmers as they coalesce at the finish to celebrate a morning of exploring the Mawddach Estuary.

The swim and run routes weave between mountains, not hills. Waves, geese, camaraderie and our superb safety crew line the swim route, whilst runners will explore the breath taking Mawddach Trail, crossing the iconic Barmouth Bridge and watching the tide come in along the estuary as you make progress towards the historic Penmaenpool Toll Bridge. One of the The Outdoor Swimming Society team’s favourite swims, you’re in for a treat if you join us.

We ask that swimmers are able to swim 1 mile in 35 minutes or under to guarantee reaching the finish with tidal assistance and swimming, rather than safety crew leapfrogging.

Jess Rose
Jess Rose
Tim Bridges



Our new look golden ticket, the Seasonaire ticket is all about creating a community. Swimmers that join us for a whole year of swimming are a special kind of people, and we really want to show how much we value the support of the people that take on this challenge! 

As well as confirmed entry to the Sunrise Swoosh, one day of the Dart 10k and the Hurly Burly, ‘Seasonaires’ will also receive the following benefits:

  • A special Seasonaire Tee and swimming hat to wear at all three events, so we and you can recognise each other.
  • Early bird access to 2021 tickets. 
  • Organised opportunities for Seasonaires to socialise with each other and the OSS Team throughout the year.

Seasonaire tickets can also be upgraded to include a Bantham Boomerang ticket rather than the Sunrise Swoosh, a Dart 10k Double Dipper ticket and/or a Hurly Burly Run-swim ticket. All of this can be done on the Seasonaire ticket page. 

Jess Rose


The OSS team of volunteers are the lifeblood of events. Marshalling the events and caring for the swimmers are great ways to support the OSS, and there are plenty of perks too, including free meals, merchandise, and VIP status with early bird access to next year’s events. If you or your supporters would like to be involved, please read the Bantham Boomerang and Sunrise Swoosh volunteering factsheet, Dart 10k volunteering factsheet or Hurly Burly volunteer factsheet

If you’d like to sign up as a member of the OSS Team, please read the factsheets above, then either join us through signing up for #OSSteam tickets for your chosen event(s) or emailing our events team

Jess Rose


Event terms and conditions explained in detail on each event page, but the most frequently asked questions are: 

  • After the statutory 14 day cooling off period, tickets cannot be refunded or deferred. 
  • We realise that situations change and you might get injured, change jobs, or get invited to your best friend’s wedding. As your entry is NON refundable we suggest you consider taking out insurance to cover any costs you incur if you are not able to attend the event. Please check the conditions of your policy carefully to make sure it provides the cover you require.
  • You may be able to transfer your ticket to another swimmer. The transfer window will open once tickets sell out. If tickets do not sell out, transfers will not be offered. Specific transfer deadlines for each event can be found on the event specific information pages.
  • No refunds are given if we have to cancel or curtail the event due to adverse weather, pollution, or other factors outside of our control.
  • If you are not happy with this small risk then we recommend that you consider a travel insurance policy that provides cover for your entry and any expenses you will have incurred. Please check the conditions of your policy carefully to make sure it covers this scenario.
  • Please see our full Event Terms and Conditions for more information.


Contacting the event team: We provide information to help with all general swimmer enquiries via the Event FAQs, and on the Facebook pages for each event. We are not able to provide help by phone, and only offer support by email for enquiries specific to your personal booking.

Tim Bridges