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Triathlon Atlas

Full distance · 4 July 2027

IRONMAN Switzerland Thun

Also known as IRONMAN Thun

Thun, Switzerland

The race at a glance

Official race website
Circuit
IRONMAN
Distance
Full distance
Terrain
Road
Swim
3.8 km
Bike
180 km
Run
42.2 km
Date
4 Jul 2027
Registration
Sold out
Swim venue
Lake
Average water temperature
17 °C
Bike profile
Hilly
Bike elevation gain
1,906 m
Run profile
Flat
Run elevation gain
79 m
High air temperature
27 °C
Low air temperature
12 °C
Overall cut-off
17 h
Entry fee, from
CHF 850
Altitude
560 m
First edition
1997
Swim start
Rolling start

Edition history

20265 Jul 2026Held
202524 Aug 2025Held
20247 Jul 2024Held
20239 Jul 2023Held
202210 Jul 2022Held
20215 Sept 2021Held
2020Cancelled
201921 Jul 2019Held
201829 Jul 2018Held
201730 Jul 2017Held

How the day is laid out

The swim is held in a lake. The wetsuit call is made on race morning, against the temperature measured then.

The organiser publishes 3.8 km of swimming, 180 km on the bike and 42.2 km of running.

The swim uses a rolling start: athletes enter the water a few at a time. The water is usually around 17 °C at this time of year.

The bike course is hilly, with about 1,906 m of climbing.

The run course is flat, with about 79 m of climbing.

Typical temperatures for the month run from 12 to 27 °C. The overall cut-off is 17 hours.

The race was first held in 1997.

A swim cut-off and a single water reading

Besides the overall cut-off, the organiser gives 2 h 20 min for the swim. The course page lists one race-day water reading, 17 °C in 2024; the 2025 and 2026 columns show no data. Air highs reached 25 °C in 2024, 28 °C in 2025 and 29 °C in 2026.

On 30 October 2026 the 2027 race was sold out, with a button to be notified of new places.

Source: ironman.com, read on 30 October 2026.

Against the calendar

Where this race sits among the others

Ranks are computed across every race of the same distance.

  • Average water temperature

    17 °C · median 22 °C

    The 2nd coldest of the 48 full-distance races with a figure, across every circuit.

  • High air temperature

    27 °C · median 25 °C

    The 19th hottest of the 52 full-distance races with a figure, across every circuit.

  • Bike elevation gain

    1906 m · median 1130 m

    The 10th hilliest of the 43 full-distance races with a figure, across every circuit.

4

races of this distance pair a hilly bike with a flat run, out of 55. 14 share the bike profile alone.

37

races across every distance fall in July, out of 354.

160

races are held in Europe. 22 of them in the same month as this one.

Questions about this race

When is IRONMAN Thun 2027?
IRONMAN Thun is held on 4 July 2027 in Thun, Switzerland. The race is sold out.
Is a wetsuit allowed at IRONMAN Thun?
Most likely. The average water temperature is 17 °C, below the 24.5 °C limit up to which wetsuits are allowed for age-group athletes. The official call is made on race morning.
What is the cut-off at IRONMAN Thun?
The course closes 17 h after the start. Intermediate cut-offs after the swim and the bike are in the athlete guide.
How hard is IRONMAN Thun?
The bike course climbs about 1906 m, the 10th hilliest of 43 full-distance races with a figure. The bike is labelled hilly and the run flat. Expect highs of about 27 °C on race day.
How much is the entry fee for IRONMAN Thun?
Entries start at CHF 850 for an individual age-group entry, before service fees. Prices rise by tier as the race fills.

Where to stay

Hotels and rentals around the race venue, for the nights around race day.

Suggested stay: 2 Jul 2027 to 5 Jul 2027

The map is provided by Stay22. Bookings are made with the provider.

Races of the same distance in the same region

Entries are handled by the organiser

Registration and the athlete guide are on the official race page.

Open the official race page