IRONMAN Switzerland Thun, Thun, Bernese Oberland, Switzerland

IRONMAN Switzerland Thun 2027

Thun, Bernese Oberland, Switzerland
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4 July 2027 Triathlon Full (iron distance) AlpineStunningHilly

A glacial lake swim under the Bernese Alps, a climbing bike leg on immaculate Swiss roads, and a run along the Aare into Thun.

Terrain
Road
Alpine foothills, immaculate roads
Elevation
Hilly
· Bernese Oberland does not do flat
Swim
Lake
Lake Thun, glacial and clear
Wetsuit
Wetsuit-legal
usually 18-21°C
Region
Switzerland
Thun, Bernese Oberland, Switzerland
Your runway

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 12-week block starts later; what you do now decides how high it can climb.

R
Recover
Fix the nervous system first. Sleep, HRV, and the noise out.
A
Align
Fit the plan to your actual life, not the one you wish you had.
C
Condition
Minimum effective dose. The right sessions, done fresh.
E
Execute
Race-week protocol, pacing, contingency. Nothing new on race day.
Predict your finish time The Ironman training plan

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.

Abraham Spring, founder of Unbroken

“Alpine scenery, perfect tarmac and a course that climbs. Respect the descents as much as the climbs, because tired bike handling at altitude is where days go wrong.”

Abraham Spring: founder, Unbroken

The race

Thun trades speed for scenery and gets a good deal. The swim is clear cold glacial water in Lake Thun with the Eiger, Monch and Jungfrau on the skyline. The bike climbs through the Bernese Oberland foothills on the kind of tarmac that makes British riders emotional. The run follows the Aare into the old town. This is a race you enter for the day itself.

Questions, answered

When is IRONMAN Switzerland Thun 2027?

IRONMAN Switzerland Thun takes place on 4 July 2027.

What distances can I race at IRONMAN Switzerland Thun?

Full (iron distance). Pick the distance that fits your training runway, not your ego: the right distance is the one you can arrive at fresh.

How hard is the course?

Road terrain, hilly profile. Bernese Oberland does not do flat

What is the swim like?

Lake Thun, glacial and clear. Wetsuit-legal, usually 18-21°C. Practise open water before race week, not during it.

How long do I need to train for it?

From today you have 47 weeks. A full 12-week recovery-led block fits comfortably: start it in the app and it anchors to this exact date.

How do I enter?

Entries are handled by the organiser. Use the Register button above: it goes straight to the official site.

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Photograph of Thun, Bernese Oberland, Switzerland: Carsten Steger, CC BY-SA 4.0, via Wikimedia Commons. Not official race photography.

This listing is for information only. Unbroken is not affiliated with, endorsed by, or sponsored by IRONMAN Switzerland Thun 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.

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