Ultra-Trail Snowdonia by UTMB

Confront one of the UK's most epic and demanding mountain challenges at Ultra-Trail Snowdonia by UTMB, part of the prestigious UTMB® World Series, from May 15-17, 2026. Set in the raw, dramatic landscapes of Snowdonia National Park (Eryri) in North Wales, the event is renowned for its brutally technical terrain and breathtakingly savage beauty, living up to its motto: "Beautiful beyond belief. Savage beyond reason." The flagship race, the UTS 100, is a true mountain ultra featuring over 10,500 meters of ascent and descent, pushing runners to their absolute limits across rugged ridges, scree slopes, and iconic peaks like Tryfan and the Glyderau. With additional distances including a 50-mile, 50km, and a half marathon, the festival offers a formidable challenge for every level of experienced trail and mountain runner, all on meticulously marked courses. As a qualifying event for the UTMB World Series Finals, it attracts a highly competitive international field of over 2,800 runners from more than 60 nationalities, creating a truly global atmosphere at the foot of the Welsh mountains. The organization is world-class, blending the local passion for the trails with the global standards of the UTMB series, ensuring safety, seamless logistics, and an unforgettable finish-line celebration. For runners seeking the ultimate test of mountain endurance, technical skill, and mental fortitude on British soil, Ultra-Trail Snowdonia stands as a definitive, must-do event in the global trail running calendar.