TRAIL- & FAMILY-RUN

Discover our new runs on Sunday August 17, 2025 and register now!

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15. - 17. August 2025

Inferno Triathlon

Welcome to one of the most beautiful and spectacular endurance competitions in the Swiss mountains. INFERNO - The ultimate experience!

Races

Choose your discipline and challenge yourself!

Discover all disciplines and get more information. Whether you are a single athlete, a half marathon, couple or team trophy participant or a family or trail runner - INFERNO is for all exercise and sports enthusiasts.

Inferno Showcase

Triathlon

Experience 5,500 meters of altitude in a breathtaking setting. One of the toughest triathlons in the world.

Inferno Showcase

Team Trophy & Couples

Whether as a team or as a couple - take on the challenge of the Inferno Triathlon! Share the disciplines, master breathtaking routes and experience unforgettable moments in the Swiss Alps.

Inferno Showcase

Half marathon & relay

Experience the “devilish mountain run” at the Inferno Half Marathon & Relay Race - with over 2,000 meters of altitude, this mountain run is a must for anyone looking for a real challenge.

Inferno Showcase

Trail- & Family-Run

The program on Sunday for young and old. For children, families and beginners! The running routes offer views of a breathtaking panorama as well as exciting (running) trails in and around Mürren.

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INFERNO Competition news

This news page is constantly updated by us and supplemented with information.

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Everyone is welcome

Instead of the Fun Triathlon on Friday, this year's Inferno Triathlon will feature trail and family runs on Sunday. Find out more about the new format.

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Blessed by fortune

On February 14, OK Inferno gave away two Couple starting places for the triathlon to celebrate Valentine's Day. Find out more about our winning couple.

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Christine Brosi: Our winner of the half marathon starting place on the occasion of international women's day.

A somewhat different “ride from hell” awaits the mother of three - the Inferno Half Marathon.

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Ralf and Betti Fey: The race for love.

Read more about our Valentine's competition couple.