Inferno Triathlon 2026: from Thun to the Schilthorn
Friday 14 to Sunday 16 August 2026, one of the toughest triathlons in the world races through the Bernese Oberland.
The Inferno Triathlon climbs 5,500 metres across four disciplines, starting in Lake Thun and finishing on the Schilthorn. Just 333 athletes line up each year, and the race is known for its alpine setting, the small race village in Mürren and the unbroken view of Eiger, Mönch and Jungfrau on the closing stages. Victoria Lauberhorn, a Faern collection resort, sits on the Wengen side of the Lauterbrunnen valley, a short train and cableway hop across to Mürren for spectators and crews.
The four disciplines
- 3 km swim starting at the Lido in Thun
- 97 km road bike to Grindelwald
- 30 km mountain bike to Stechelberg
- 25 km mountain run from Stechelberg to the Schilthorn
Race weekend at a glance
Friday 14 August. Check-in at the transition zones in Oberhofen, Grindelwald and Stechelberg from 12:00 to 17:00. Athlete briefing in Mürren at 18:00.
Saturday 15 August. Swim start at the Thun Lido at 06:30. Strict finish on the Schilthorn at 20:30. Cut-off passage times apply at each transition zone.
Sunday 16 August. Kids, Family and Trail Runs from 09:15. The event closes at 14:00.
Practical information
Dates: 14 to 16 August 2026.
Race village: Mürren, finishing on the Schilthorn.
Athlete cap: 333. Entry fees scale from CHF 530 in January to CHF 630 in August. Includes two Schilthorn cable car rides and Friday and Saturday pasta parties.
More information: inferno.ch
Stay: Victoria Lauberhorn, a Faern collection resort, in Wengen. From Wengen, Mürren is reached by train to Lauterbrunnen and the Mürren cableway.
The Inferno is unmissable for spectators. Stake out a viewing point on Allmendhubel or the Schilthorn finish line, with quiet recovery evenings at Victoria Lauberhorn.
Frequently Asked Questions
What is the Inferno Triathlon?
The Inferno is one of the toughest triathlons in the world, climbing 5,500 metres across four disciplines from Lake Thun to a finish on the Schilthorn. The legs are a 3 km swim starting at the Lido in Thun, a 97 km road bike to Grindelwald, a 30 km mountain bike to Stechelberg and a 25 km mountain run from Stechelberg to the Schilthorn. Just 333 athletes line up each year, with a small race village in Mürren.
When is the Inferno Triathlon 2026, and how does the weekend run?
The race weekend runs from Friday 14 to Sunday 16 August 2026. The swim starts at the Thun Lido at 06:30 on Saturday 15 August, with a strict finish on the Schilthorn at 20:30 and cut-off passage times at each transition zone. Kids, Family and Trail Runs follow on Sunday from 09:15, and the event closes at 14:00.
How much does entry cost, and what is included?
Entry fees scale from CHF 530 in January to CHF 630 in August, and the field is capped at 333 athletes. The fee includes two Schilthorn cable car rides and the pasta parties on Friday and Saturday. Athlete check-in runs on Friday from 12:00 to 17:00 at the transition zones in Oberhofen, Grindelwald and Stechelberg, with the briefing in Mürren at 18:00; more information is on inferno.ch.
Where can spectators watch the race from Wengen?
The race village is in Mürren, across the Lauterbrunnen valley from Wengen: take the train to Lauterbrunnen, then the Mürren cableway. Good viewing points are Allmendhubel and the finish line on the Schilthorn. The closing stages carry an unbroken view of the Eiger, Mönch and Jungfrau.
Why base myself at Victoria Lauberhorn for the Inferno?
Victoria Lauberhorn sits on the Wengen side of the Lauterbrunnen valley, a short train and cableway hop across to Mürren for spectators and supporting crews. Wengen stays quiet while race weekend fills the other side of the valley. Evenings back at the hotel bring recovery in Wengen's largest wellness area.