Ultra-Trail Snowdonia by Utmb

Llanberis, United Kingdom • 15-17 May 2026

Ultra-Trail Snowdonia by UTMB® : May 2026

Ultra-Trail Snowdonia by UTMB® is scheduled for 15 to 17 May 2026 in Llanberis, North Wales. The event is part of the UTMB World Series and takes place on technical mountain trails in the Eryri Snowdonia area. The 2025 edition featured more than 60 nationalities and over 2,800 finishers across the four distances.

Races and entries

  • UTS 100M - 164 km, 9,500 m+ elevation gain, Running Stones 4
  • UTS 100K - 104 km, 6,500 m+ elevation gain, Running Stones 3
  • UTS 50K - 56 km, 3,400 m+ elevation gain, Running Stones 2
  • ERYRI 25K - 25 km, 1,400 m+ elevation gain, Running Stones 1

Registration notes in the source: the UTS 100K and UTS 50K are marked as full. Registrations are open for the UTS 100M and ERYRI 25K. Listed entry fees (exclusive of an 8% booking fee) are £299 for UTS 100M, £239 for UTS 100K, £189 for UTS 50K, and £139 for ERYRI 25K. Visit the organization's website for the most recent information.

Race information

UTMB 20K UTMB 50K UTMB 100K UTMB 100M
164 km
Uts 100m
104 km
Uts 100k
56 km
Uts 50k
25 km
Eryri 25k
Visit the organization's website for the most recent information.
Trail runs nearby

On 24 January 2026 take on a stunning but tough mountain loop around Yr Wyddfa from Llanberis, organised by Eryri Harriers. Choose whole, half, relay or pair formats and be ready for winter conditions and mandatory kit.

Join a scenic half marathon from Cwt Tatws to Aberdaron along coastal and quiet inland trails for stunning views and a friendly vibe. Finishers get a Celtic medal and event tee while supporting The DPJ Foundation and Neuroendocrine Cancer U..

Tackle a scenic but testing 6.8 km fell course around Dolgarrog with 417 m of climb, hosted at Canolfan Porthlwyd. Entry on the day; minimum age 16 makes it perfect for adventurous runners.

Take on the Beast of the Blacks in the Black Mountains of Wales with 11, 20 or 40 mile routes across mountain tops, forests and rivers. Fully marked courses with GPX files and onsite support welcome runners and canicross teams.