IRONMAN Wales 2027
The most atmospheric IRONMAN on earth. A dawn sea swim off Tenby's North Beach, 180km of brutal Pembrokeshire climbing, and a marathon through streets so loud they carry you.
2027 edition completed
This record covers the 19 September 2027 edition of IRONMAN Wales in Tenby, Pembrokeshire, with a 3.8 km swim, a 180.2 km bike and a 42.2 km run. This date belongs to a completed edition. The course record remains available. Course descriptions and coaching notes are archived context for this edition. Check the organiser for a future edition once its date and entry details are published.
48 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? Ironman 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.
Train locally, personally or in the app.
Choose the level of support that fits your week. Club sessions and coaching are separate services from app membership.
Build my complete road
Three honest inputs. Your first answer appears here; no email wall and no generic plan.
Course risk: The sea swim deserves specific open-water rehearsal.
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.
“The hardest thing on this list and the best crowd in world triathlon. You do not race Tenby off a shortcut. Give it a full, patient build.”
The race
The evidence, translated into a decision.
This is not another difficulty score. It connects verified course evidence to the athlete constraints you have already shared with Unbroken.
Choose this race if you are willing to rehearse open-water confidence and want a course where patient climbing matters.
Think twice if your available week cannot protect bike durability and recovery; the GPX-derived bike profile shows 2260m of gain.
Build durable climbing, low-cadence strength and disciplined descents, then practise running smoothly after variable bike load on hills.
The course
Interactive swim route in the Course Lab above ↑ Drawn from the official GPX file, checked against this leg's distance.
Two laps off North Beach in Tenby, in genuine sea rather than a sheltered bay. Then the zig zag: a long ramp up off the beach into transition that has become the signature image of this race. It is part of the swim, not part of T1, and it should be in your legs before race day.
Interactive bike route in the Course Lab above ↑ Drawn from the official GPX file, checked against this leg's distance.
Two loops through the Pembrokeshire Coast National Park, and the reason this is considered the hardest IRONMAN bike in the calendar. Around 2,400m of climbing on narrow, exposed, relentlessly undulating roads. There is no long climb to pace; there is no flat to recover on either.
Interactive run route in the Course Lab above ↑ Drawn from the official GPX file, checked against this leg's distance.
Four laps through the medieval town walls and along the beachfront, lined the whole way by what is reasonably argued to be the best crowd in world triathlon. It is a hilly marathon on tired legs, and the noise is the only reason anyone runs it as fast as they do.
Not yet confirmed for this edition: water temperature, 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.
Course details verified against the official IRONMAN Wales course page on 13 August 2026. Courses change; the official page is always the last word.
What is measured, observed and still unknown
Questions, answered
When is IRONMAN Wales 2027?
What distances can I race at IRONMAN Wales?
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
Half Ironman Recovery Time: A Practical Return
How to Choose Your First European IRONMAN
European IRONMAN Calendar and Race Comparison Guide
More races like this
Photograph of Tenby, Pembrokeshire: Derek Harper, 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 Wales 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 entry, always use the official event website.