IRONMAN Switzerland Thun takes place on Sun, Jul 4, 2027 in Thun, Switzerland. The main route is 226.3 km.
- Date
- Sun, Jul 4, 2027
- Start
- Thun 🇨🇭
- Distance
- 226.3 km
- Level
- Open to all
Your 39-week plan to IRONMAN Switzerland Thun
The Base phase starts this week. Built around your fitness and adjusted every day as your form changes; attach the course and it prepares for the climbs too.
Build my planFree to start · No credit card
Experience IRONMAN Switzerland: a 3.8 km swim in Lake Thun, a 180 km challenging bike ride through the Swiss Alps, and a 42.2 km run across scenic bridges.
What this race demands
IRONMAN Switzerland Thun demands sustained physical and mental endurance across a 3.8 km swim, a 180 km alpine bike course, and a full 42.2 km marathon. Athletes must manage their energy systems carefully to complete the full-distance triathlon format.
Open Water Swimming
The 3.8 km swim in Lake Thun requires efficient sighting and pacing from the start to preserve energy for the long day ahead.
Alpine Cycling Strength
The 180 km bike ride through the Swiss Alps demands robust climbing capability and muscular endurance to handle extended elevation profiles over a multi-hour effort.
Marathon Durability
The final 42.2 km run across scenic bridges tests structural durability and the ability to maintain a steady running stride under profound cumulative fatigue.
A continuous carbohydrate intake of 60 to 90 grams per hour is required to sustain energy output across the long duration of this full-distance event.
Estimated finish times
Estimates by level, not promises. Your own number depends on your fitness on the day.
Your road to race day
Race day at IRONMAN Switzerland Thun is 39 weeks away. This is how a coach divides that time. The first phase starts now.
01Base27 weeks · Oct 5, 2026 – Apr 11, 2027
Aerobic foundation: mostly steady endurance work that grows the aerobic engine and the durability the later phases stand on.
02Build6 weeks · Apr 12, 2027 – May 23, 2027
Progressive overload: training load climbs in waves, with harder weeks stacked on the base and planned recovery weeks that let the gains land.
03Peak3 weeks · May 24, 2027 – Jun 13, 2027
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
04Taper2 weeks · Jun 14, 2027 – Jun 27, 2027
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
05Race week1 week · Jun 28, 2027 – Jul 4, 2027
Openers, rest and logistics. The work is done; the job now is arriving fresh.
Frequently asked questions
When is IRONMAN Switzerland Thun?
IRONMAN Switzerland Thun takes place on Sun, Jul 4, 2027 in Thun, Switzerland.
How long is IRONMAN Switzerland Thun?
The main route is 226.3 km.
What does IRONMAN Switzerland Thun demand?
IRONMAN Switzerland Thun demands sustained physical and mental endurance across a 3.8 km swim, a 180 km alpine bike course, and a full 42.2 km marathon. Athletes must manage their energy systems carefully to complete the full-distance triathlon format.
Who is IRONMAN Switzerland Thun for?
IRONMAN Switzerland Thun is open to all participants.
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