IRONMAN 70.3 Swansea 2027
A sea swim in Swansea Bay, a genuinely hilly bike out onto the Gower peninsula, and a run along the seafront. The tougher of Britain's two IRONMAN 70.3s.
47 weeks to race day: base season
Plenty of runway. This far out, the win is a boring, consistent base rhythm: aerobic volume, strength, technique. The structured block starts closer in; what you do now decides how high it can climb.
Building for this one? 70.3 training plan covers the sessions, the weekly shape and how the block is paced. The R.A.C.E. Framework explains why it is built that way.
Build my complete road.
Commit to the date and the work gets a shape: your countdown starts, the emails arrive in step with your build, and the app anchors a recovery-led block so the final week lands exactly on race day.
One confirmation email, then the road begins. Registering for the race itself stays with the organiser.
“Wales does not do flat, and Swansea is no exception. Treat this as a hill race with a swim in front of it and gear accordingly.”
The race
The course
One loop in the Prince of Wales Dock. Enclosed dock water, so no swell and no current, which makes it one of the more forgiving swims on the calendar for a first half distance.
One and a half loops out through Mumbles on roads hugging the Gower clifftops, into rural Swansea and back along the bay. The half lap is deliberate, so know where you rejoin, and the clifftop roads are exposed enough that wind matters more than the profile suggests.
Two loops from the city centre out past the Swansea Arena towards Mumbles and back to finish at the Marina. Seafront running, which is flat and fast when it is still and a fight when it is not.
Not yet confirmed for this edition: bike elevation gain, cut-off times, aid station spacing, water temperature history. We publish these only once they are on the official course page, so check there before you pace off anything here.
Maps © OpenStreetMap contributors. Routes from the official GPX.
Course details verified against the official IRONMAN 70.3 Swansea course page on 13 August 2026. Courses change; the official page is always the last word.
Questions, answered
When is IRONMAN 70.3 Swansea 2027?
What distances can I race at IRONMAN 70.3 Swansea?
How hard is the course?
What is the swim like?
How long do I need to train for it?
How do I enter?
Read before you race
IRONMAN 70.3 Tallinn Training Guide
How Much Harder Is a Full IRONMAN Than a 70.3?
IRONMAN Kalmar Swim Preparation for Open Water and Contact
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Photograph of Swansea, Wales: Lewis Clarke, CC BY-SA 2.0, via Wikimedia Commons. Not official race photography.
This listing is for information only. Unbroken is not affiliated with, endorsed by, or sponsored by IRONMAN 70.3 Swansea or its organiser. Details are based on publicly available information; names are used descriptively to identify the event. For accurate, up-to-date information and to enter, always use the official event website.