Snowdonia · May · UTMB World Series

Ultra-Trail Snowdonia by UTMB (UTS)

The UK's first Alpine-scale ultra — "Beautiful beyond belief. Savage beyond reason." Five distances from 25km to 163km through the rugged mountains of Eryri (Snowdonia) National Park.

5 Distances

25km–163km

May 2026

Race Week

Llanberis

Race Hub

UTMB Series

Running Stones

COACH

Brennan & Kat Townshend — UTMB World Series Athletes

Both Brennan and Kat have competed at the front of UTS events. Brennan won the UTS 50km outright; Kat finished 5th in the UTS 25km in 3:08. Their first-hand race experience shapes every UTS coaching and training plan we deliver.

The Distances

UTS 100M

163km · 9,200m+ · The ultimate grand-tour of Snowdonia. Starting and finishing in Llanberis. 4 Running Stones.

Sold Out 2026

UTS 100K

106km · 5,400m+ · Highlights of northern Eryri. Technical ridges and epic views. 32.5hr cut-off.

3 Running Stones

UTS 80K

80km · Starting in Caernarfon. A mid-distance challenge through stunning mountain terrain.

3 Running Stones

UTS 50K

56km · 3,400m+ · Includes Yr Wyddfa (Snowdon) summit. 14hr cut-off. Perfect Alpine-scale introduction.

2 Running Stones

Eryri 25K

25km · 1,300m+ · Starting in Llanberis. An incredible mountain race in its own right.

1 Running Stone

About UTS

Ultra-Trail Snowdonia is the UK's answer to the big Alpine ultras — a UTMB World Series event that brings genuine Alpine-scale challenge to North Wales. With technical trails, rocky ridges, scrambling sections and elevation that rivals European mountain races, UTS is one of the toughest race series in the world relative to distance.

The UTS 100M covers 163km with 9,200m of elevation — making it one of the most demanding 100-mile races anywhere. Even the 50K with 3,400m of ascent and highly technical terrain is a serious challenge for experienced mountain runners.

Key Facts

All routes start in Llanberis (except UTS 80K from Caernarfon)
UTS 50K includes an ascent of Yr Wyddfa (Snowdon) — highest peak in Wales
Technical scree, rocky paths and ridgelines throughout all distances
Highly competitive international field — this is a proper world-class race
UTMB World Series Final qualifying event
60+ nationalities represented — one of the UK's most international races
May 2026: 15-17 May (UTS 100M on 15th May)

Preparation Tips

Technical Mountain Running

UTS is significantly more technical than most UK ultras. Specific training on scree, rocky ridges and technical descents is essential. Don't underestimate the terrain.

Elevation Specific Training

The elevation density at UTS is extreme — particularly on the 100M. Include regular mountain days with significant vertical gain and loss. Back-to-back days are essential.

Mandatory Kit

UTS has a strict and comprehensive mandatory kit list. Familiarise yourself well in advance and practice racing with full kit weight.

UTMB Index & Qualification

Most UTS distances require a minimum UTMB Index. Build your index through qualifying races before targeting UTS. The 50K is an excellent stepping stone before the longer distances.

Training for Ultra-Trail Snowdonia by UTMB?

We build bespoke training plans and coaching packages for this race. Get in touch to discuss your preparation.

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