Ironman 70.3 Dun Laoghaire

Dun Laoghaire (pronounced 'Dun Leery') is a seaside town on the southern shore of Dublin Bay — a Victorian harbour with granite piers, sailing clubs, and the particular brand of Irish coastal charm that involves excellent pubs, unreliable weather, and water cold enough to make you question every decision that led you here.

The Irish Sea swim is the headline act: 14°C in August. Let that temperature sit with you for a moment. Fourteen degrees. That's genuinely cold — cold enough that some editions have been modified due to water temperature concerns. Wetsuits are mandatory and welcome, but even with neoprene, the first minutes in the Irish Sea are a full-body protest. Your hands go numb. Your face aches. Your breathing accelerates involuntarily as your body fights the cold-water shock response. And then, gradually, your body acclimatises. The gasping subsides. The numbness becomes background noise. And you realise you're swimming in Dublin Bay, with the Howth peninsula on one side, the Wicklow Mountains on the other, and the Victorian pier stretching out beside you like a granite guardian. The water is clear — surprisingly so — and the Irish Sea has a weight and wildness that makes every other open-water swim feel domesticated.

The bike heads south into the Dublin and Wicklow hills — rolling terrain through the green countryside that inspired a thousand Irish poems and at least one Braveheart-adjacent film location. Seven hundred metres of climbing through hedgerow-lined lanes, past the Sugar Loaf mountain's distinctive cone, and through villages where the pubs outnumber the houses. The Wicklow hills are not Alpine — they're not high enough to intimidate — but they're relentless in the way Irish terrain always is: rolling, undulating, never flat for long, and always with another rise waiting around the corner. The road surfaces are good by Irish standards, the route well-marshalled, and the views of the Wicklow hills — green and brown and impossibly textured — are the kind of landscape that makes you understand why the Irish are so attached to their countryside.

The run follows the Dun Laoghaire coastal path, with Dublin Bay on one side and the Victorian architecture on the other. The seafront promenade gives you views across to Howth, and the August light — when it cooperates — catches the bay in shades of grey and blue that photographers spend careers chasing. The Irish crowd brings what Irish crowds always bring: warmth that has nothing to do with the temperature. The craic — that untranslatable Irish concept of fun, conversation, and communal enjoyment — transforms the finish area into something between a race celebration and a session at the local.

Eighty-two nations on the start list in a town of 27,000 people tells you something about the pull of Irish triathlon. The race draws heavily from Britain and mainland Europe, but the international contingent comes for something specific: the combination of cold-water swimming, green-hill cycling, and the social atmosphere that only an Irish event can deliver. The post-race pint of Guinness in a Dun Laoghaire pub — still in your tri-suit, salt in your hair, legs protesting every step to the bar — is not an optional part of the experience. It's the recovery protocol.

Dun Laoghaire 70.3 is Irish triathlon: cold water, green hills, warm people, and the quiet certainty that the weather will test you and the craic will reward you.