IRONMAN Switzerland Thun
The full distance at Thun asks for two different athletes on the same day. The 3.8 km swim is in Lake Thun, glacier-fed and cold, then 180 km climbs into the Bernese Oberland, and finally a 42.2 km run crosses the bridges of the town centre on flat ground in the afternoon heat.
The bike is where the day is decided. Alpine climbing over that distance is a different physiological problem from riding a flat 180 km at threshold, and riders who arrive with only flat-course pacing experience tend to blow the second half of the ride and then walk the marathon.
Early July in the valley can be hot even when the lake is cold, so the temperature swing between the swim and the run is wide.
Switzerland is an expensive race weekend. Thun accommodation books out early, and the trains from Bern and Zurich are the practical alternative to driving.
Who it's for
Built for experienced triathlon athletes.
Good fit if you…
- are experienced in triathlon and want a hard race
- want a well-known, high-status race
Maybe not if you…
- are brand-new to triathlon: start with something shorter
What should you know about IRONMAN Switzerland Thun?
- Date
- Sunday, 4 July 2027
- Format
- Full Distance / 140.6
- Water temp
- 21°C · 70°F
Need to know
When is IRONMAN Switzerland Thun 2027?
IRONMAN Switzerland Thun takes place on Sunday, 4 July 2027. Dates can move year to year, so confirm the exact day on the official race page before you book travel.
How do you register for IRONMAN Switzerland Thun?
Where does IRONMAN Switzerland Thun take place?
Thun, Switzerland
When has IRONMAN Switzerland Thun taken place before?
FAQs
What do athletes ask about IRONMAN Switzerland Thun?
Where is IRONMAN Switzerland Thun held?
IRONMAN Switzerland Thun is held in IRONMAN Switzerland Thun, Switzerland. The race page has the venue location and a map, and links straight through to the official site for the precise start area.
What distances can you race at IRONMAN Switzerland Thun?
IRONMAN Switzerland Thun offers Full Distance / 140.6. The Full Distance / 140.6 is a 3.8 km swim, 180 km bike and 42.2 km run. Pick your distance and enter on the official site. Each format usually has its own start wave and cut-offs.
What's the water temperature at IRONMAN Switzerland Thun?
The swim at IRONMAN Switzerland Thun is around 21°C (70°F), based on the official average for the venue. Water temperature drives wetsuit rules, so check the organiser's current wetsuit policy before race day.
How do I enter IRONMAN Switzerland Thun?
You enter IRONMAN Switzerland Thun through the official organiser. Registration is handled on their site, and FindMyNextRace links you straight there. Places for popular editions can sell out early, so register as soon as entry opens.
Is IRONMAN Switzerland Thun part of a race series?
Yes, IRONMAN Switzerland Thun is part of the IRONMAN series. Series events often share a qualification, points, or championship pathway, so if you're chasing the series, check how this race fits its calendar.
How should I train for IRONMAN Switzerland Thun?
Training for IRONMAN Switzerland Thun depends on your target distance and current fitness. Most athletes follow a structured block of 12–20 weeks for a Full Distance / 140.6 effort. Build a plan tailored to your race date and level with AI Training Plan (https://aitrainingplan.app).
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