woman walking on green grass field

Ultra-Trail Snowdonia by UTMB 25K

25K·1,400m gain·Llanberis, United Kingdom
ultra100 mile100k50kmountaintechnicaltrailqualifier

Photo by Massimo Sartirana on Unsplash

Distance25K
Gain1,400m
Date15 May 2026
Difficulty2/5

About This Race

The 25K serves as the perfect introduction to Snowdonia's demanding terrain, offering runners a substantial mountain challenge without the ultra-distance commitment of the longer races. This distance strikes an ideal balance for those seeking to experience the technical rocky trails and elevation changes that define the event, while maintaining a pace that allows for appreciation of the dramatic Welsh landscape. Strong trail runners new to mountain ultras will find this distance provides serious preparation for future UTMB World Series events, while experienced mountain runners can use it as a intense training run or recovery race between bigger objectives.

The 25-kilometer introduction to Ultra-Trail Snowdonia features 1,400 meters of elevation gain. This Running Stones 1 category race offers newcomers a taste of Welsh mountain running without ultra-distance commitment.

Elevation

1,400m(4,593 ft)

Elevation gain

Map showing Ultra-Trail Snowdonia by UTMB 25K location

Detailed elevation profile coming soon

Practical Info

Weather

Variable mountain conditions typical of North Wales in May, with potential for rain, wind, and temperature changes with elevation

Nearest Airport

MAN - Manchester Airport

Accommodation

Llanberis offers various accommodation options from B&Bs to hotels, with additional lodging available in nearby Snowdonia villages

Best For

experienced trail runnersultra runnersmountain runners

Notable Features

As part of the UTMB World Series, this race maintains the highest standards of organization and course design. The event showcases the dramatic landscapes of Snowdonia National Park through technical single track that demands both fitness and technical skill. The multi-day format creates a festival atmosphere in the historic mountain town of Llanberis, complete with family activities including the ERYRI MINI kids' race.