Trail running course near Fieberbrunn, Tyrol, AT
KAT100 by UTMB

KAT100 by UTMB 51K

51K·Fieberbrunn, Austria
ultra50kmountainforesthigh altitudetechnicaltrailqualifier

AI-generated image

Distance51K
Date6 Aug 2026
Difficulty3/5

About This Race

The KAT100 by UTMB 51K serves as the gateway distance in this prestigious Austrian mountain series, offering runners a substantial yet approachable introduction to Alpine ultra racing. Based in the resort town of Fieberbrunn in the Kitzbühel Alps, this course delivers the full character of Tyrolean mountain running—technical terrain, sustained climbs, and high-altitude passages—without the extreme commitment required by the 100-kilometer and 100-mile distances. The 51K distance positions itself thoughtfully for runners making the leap from road marathons to mountain ultras, or for experienced trail runners seeking a challenging day in iconic Alpine terrain. The mixed terrain demands mountain-specific fitness and technical competence, while the distance remains within reach for well-prepared runners who may not be ready for the multi-day training blocks required by longer UTMB distances. As part of the UTMB World Series, the race attracts an international field and offers the polished event infrastructure the series is known for—well-stocked aid stations, professional timing, and the celebratory atmosphere that defines UTMB events worldwide. Fieberbrunn provides convenient access from Innsbruck and Munich, making travel logistics straightforward for both European and international runners.

The course traverses mixed terrain characteristic of the Kitzbühel Alps, combining forested singletrack, Alpine meadows, and exposed ridgeline sections. Runners navigate through classic Tyrolean landscapes, with the route likely featuring both sustained climbs and technical descents that require confident footing and mountain running experience. The August timing typically means dry, runnable conditions, though Alpine weather remains variable and runners should prepare for temperature fluctuations at higher elevations.

Location

Practical Info

Weather

August in the Tyrolean Alps typically brings warm valley temperatures (18-25°C) with cooler conditions at elevation; afternoon thunderstorms possible, requiring layers and weather awareness.

Nearest Airport

SZG

Accommodation

Fieberbrunn offers a range of mountain lodging from traditional guesthouses to hotels; book early as this is peak summer season in a popular Alpine resort region. Innsbruck (90km) provides additional accommodation options with good transport connections.

Best For

mountain runnersultra runnerstrail running enthusiastsUTMB qualifiers

Notable Features

Part of the prestigious UTMB World Series, this race provides access to world-class mountain running in the Kitzbühel Alps with the organizational excellence and international atmosphere that defines UTMB events. The location in Austria's renowned Tyrol region offers stunning Alpine scenery and a strong mountain culture, while Fieberbrunn serves as an ideal base with genuine mountain town character rather than mass-market resort feel.

Other Distances at This Event

8K

250m gain

Perfect for families and trail running newcomers, this short course explores the beautiful valley terrain around Fieberbrunn. The gentle route offers stunning alpine views without demanding technical skills.

24K

The KAT100 by UTMB 24K runs through the Kitzbühel Alps in Austria's Tyrol region, based from the mountain village of Fieberbrunn. As part of the UTMB World Series, this race maintains the organization and course marking standards expected from the circuit while offering a distance that suits runners new to Alpine terrain. The August timing places the event in the heart of the Alpine summer season, when the high pastures are accessible and the mountain weather is most stable. The 24-kilometer distance fits between a long trail race and a short ultra, requiring more than quick legs but less than full ultra endurance. Runners moving up from road marathons or standard trail distances will find enough challenge to test their mountain skills without committing to 12-plus hours on course. The mixed terrain typical of the Kitzbühel Alps includes forest paths, alpine pastures, and rocky sections that demand attention to foot placement. Fieberbrunn sits in the PillerseeTal valley, a quieter alternative to nearby Kitzbühel that retains its working village character outside of ski season. The KAT100 weekend draws an international field through its UTMB affiliation, creating a focused trail running atmosphere without the overwhelming scale of larger circuit stops.

81K

Runners cover 81 kilometers through the Kitzbühel Alps on terrain that varies from groomed mountain paths to technical alpine sections requiring careful navigation. The course profile and specific elevation gain remain unconfirmed, though the region's geography suggests significant vertical challenge. Extended sections above treeline expose runners to alpine weather conditions and require self-sufficiency between aid stations.

173K

The 173K route traverses the Kitzbühel Alps from Fieberbrunn, moving through a series of mountain passes and valleys that characterize this region of Tyrol. The terrain alternates between technical singletrack, wider alpine trails, and occasional jeep roads connecting high mountain huts. Sections of the course reach exposed ridgelines where runners encounter rocky, uneven surfaces requiring careful footing. The route shares many segments with the longer 200K course, providing a comprehensive tour of the region's geography. Runners pass through small mountain communities and alongside traditional alpine farming operations before returning to Fieberbrunn. The mixed terrain includes rooted forest trails at lower elevations and scree sections at higher points, with sustained transitions between altitude zones throughout the distance.