Welcome to Leinster Open Sea

We are a not for profit organisation working with swimming clubs to establish a summer season of open sea races in a variety of locations along the Leinster. We cater for all ages and abilities from teenagers to senior citizens and from novice swimmers to former internationals.

If you are new to Leinster Open Sea swimming, please see our information for first time swimmers. Swim races are held every weekend with an average distance of 1 mile. For swim locations and start times see our race calendar.

There are four annual major swims: the Dublin City Liffey Swim, the Dún Laoghaire Harbour Race, the Lough Dan Races and the Island Race (from Ireland’s Eye to Howth). For background information and the history of these swims, click the links above. For up-to-date race information, including race dates, entry fees, closing dates and how to register, click here.

So if you like a challenge, keeping fit and enjoy meeting people of all levels of swimming ability – we’d love to have you join us on one of our many sea swims during the summer months.

Simple Steps to Competing in the Leinster Open Sea Races

To swim in the  Leinster Open Sea Races you must:

I) Join a swimming club (if you live in Leinster) List of Clubs;
II) Read the Leinster Open Sea Rules Download here; and
III) Consent to these rules by completing  Online Rules and Swimmers’ Declaration;

After Completing the Online Rules and Swimmers’ Declaration you will be emailed a Race Number which you will use for the 2017 season. No Race Number No Swim.

If you need assistance with any of the above please email contact us and include your phone number.  We will be more than happy to assist.


For the latest updates, follow us on social media:


For any other inquiries, use our contact form.

Swim safe!