Trail running course near Grindelwald, Bern, CH
Eiger Ultra Trail by UTMB

Eiger Ultra Trail by UTMB 101K

101K·Grindelwald, Switzerland
ultra100kmountainhigh altitudetechnicaltrailqualifier

AI-generated image

Distance101K
Date15 Jul 2026
Difficulty4/5

Registration is closed for Eiger Ultra Trail by UTMB 101K

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About This Race

The Eiger Ultra Trail 101K serves as the flagship middle-distance race in the UTMB World Series event held in Switzerland's Bernese Oberland. Set against the iconic North Face of the Eiger, this course threads through the high alpine terrain surrounding Grindelwald, moving through terrain that ranges from forested valleys to exposed mountain passages. The route typically draws runners with solid ultra experience who want a significant mountain challenge without the multi-day commitment of longer UTMB distances. As part of the UTMB World Series, the race follows the organization's established standards for course marking, aid station support, and live tracking. Runners navigate the technical demands of alpine trails while managing elevation changes that test both climbing efficiency and descent control. The July timing places the race during the height of summer in the Swiss Alps, when trails are generally clear of snow but alpine weather remains variable. The 101K distance sits in a practical middle ground for mountain ultra runners—long enough to require thoughtful pacing and nutritional planning, but manageable within a typical training cycle for those with previous 50K or 100K experience. The Eiger region provides sustained immersion in high mountain terrain without requiring the overnight running that defines the event's longer distances.

The route explores the trail network surrounding Grindelwald, moving through multiple valleys and alpine zones in the Jungfrau region. Runners encounter the characteristic features of Swiss mountain trails: well-maintained but steep switchbacks, occasional technical sections across scree or root systems, and passages through high alpine meadows. The course typically includes sections with views of the Eiger, Mönch, and Jungfrau peaks, though weather conditions in the mountains can limit visibility.

Aid stations follow UTMB standards, positioned at strategic intervals with both nutrition and staffing designed for mountain ultra distances. The mixed terrain requires versatile mountain running skills—comfortable descending on technical surfaces, efficient climbing on sustained grades, and the ability to adjust pacing across varied footing throughout the distance.

Location

Practical Info

Weather

July brings summer conditions to the Swiss Alps, with daytime temperatures ranging from cool at higher elevations to warm in valleys. Mountain weather can change rapidly, with afternoon thunderstorms possible. Runners should prepare for both sun exposure and sudden temperature drops.

Nearest Airport

ZUR - Zurich Airport

Accommodation

Grindelwald offers extensive lodging options ranging from hotels to mountain hostels, given its status as a major alpine tourism center. The village is accessible by train from Interlaken and provides good infrastructure for race week logistics. Book accommodations well in advance, as the UTMB event draws international participants and coincides with peak summer tourism season.

Best For

mountain runnersultra runnersinternational travelersexperienced trail runners

Notable Features

The Eiger Ultra Trail benefits from its position within the UTMB World Series, bringing the organization's operational standards and international field to one of Switzerland's most recognizable mountain settings. The race takes place in terrain that has defined alpine mountaineering history, with the event's infrastructure built around Grindelwald's established trail network and mountain tourism resources. The July date allows the event to showcase the Bernese Oberland during peak summer conditions, when the high alpine zones are most accessible to trail runners.

Other Distances at This Event

15K

800m gain

This 15K surprise course offers 800 meters of elevation gain, providing participants with an element of discovery in their Alpine adventure. The shorter distance allows runners to focus on enjoying the spectacular mountain environment and Swiss trail running culture.

16K

The route begins in Grindelwald and climbs into the network of trails that connect the valley's mountain stations and alpine huts. Expect a combination of wide mountain paths used by hikers and narrower singletrack sections that require technical footwork. The course design emphasizes the vertical nature of this landscape, with climbs that gain altitude steadily rather than gradually, and descents that demand controlled technique on uneven surfaces.

35K

The course departs Grindelwald and climbs through mixed forest before emerging into alpine pasture with views across the Lauterbrunnen valley. Runners traverse high trails beneath the Eiger's north wall, passing through terrain where rock, grass, and snow meet. Technical sections alternate with runnable alpine track, demanding both climbing fitness and descent control. The route returns to Grindelwald through different valleys than the ascent, completing a loop that showcases the region's varied alpine environments.

51K

The course explores the terrain surrounding Grindelwald, moving through a landscape shaped by glacial valleys and limestone ridges. Runners encounter the mixed surfaces typical of Swiss mountain trails: maintained hiking paths, rocky sections requiring careful foot placement, and alpine pasture crossings. The route profile reflects the vertical nature of the Bernese Oberland, though specific elevation details are not currently published. Grindelwald sits at approximately 1,034 meters elevation, and the surrounding trail network extends both higher into the peaks and lower into adjacent valleys. The mid-July timing means runners face full summer conditions at altitude, with potential afternoon weather changes common in the Alps.

250K

The 250K course loops through the Bernese Oberland, connecting Grindelwald with surrounding valleys and alpine passes in a route that showcases the full character of Swiss mountain running. Runners move through diverse ecosystems, from flower-filled meadows and larch forests to exposed ridgelines and glacier-carved terrain. The route includes multiple significant climbs and descents, with technical sections demanding careful foot placement and sustained concentration. Aid stations are spaced according to UTMB standards, but runners should expect longer stretches of self-sufficiency than in shorter formats. Navigation skills are essential, particularly if weather deteriorates or if running through the night. The course passes through traditional Swiss villages where local support adds energy to difficult moments, though much of the route unfolds in wild, remote terrain where runners must rely entirely on their own preparation and resolve.