Snowdon24

Llanberis, United Kingdom • 11 Jul 2026

Yr Wyddfa | Snowdon24

Yr Wyddfa | Snowdon24 is a 24 hour ultra trail running challenge based at the foot of Yr Wyddfa (Snowdon) in Llanberis. Yr Wyddfa is the highest mountain in Eryri (Snowdonia) and in England and Wales, peaking at 1,085 m (3,560 feet). The event asks participants to ascend and descend the mountain as many times as possible within 24 hours.

Entries are available for solo runners and for teams of up to five running in a relay format. Individual challenge options include:

  • 50k UTMB indexed challenge
  • 100k UTMB indexed challenge
  • 100 mile UTMB indexed challenge

The event village provides toilets, food, shopping, music and commentary during daylight hours. Facilities include rest areas with tent pitches and a chill out zone. On course support includes marshals, route signage and Mountain Leader support. Timing is managed with chip timing, tracking and online results. Finishers receive event mementos designed to reflect the location and local history. The event is bilingual with services available in English and Welsh.

The event lists Cancer Research Wales as its official charity partner and allows fundraising for this and other charities. The public record for laps completed during the 24 hour challenge is noted as eight laps. Visit the organization's website for the most recent information.

Race information

100 mi
100 Miles
100 km
100k
50 km
50k
Visit the organization's website for the most recent information.
Trail runs nearby

A mountain running weekend in Rhyd-Ddu, Eryri / Snowdonia on 15 August 2026 with four skyraces from 16 km to 55 km over high, technical terrain.

A very short but steep mountain race on Tryfan near Bethesda, with exposed rocky terrain and expert navigation required. Minimum age over 18 and a £1 entry fee supports Ogwen Mountain Rescue.

A hill race near Porthmadog covering 7.2 km with 564 m of ascent, partially marked and requiring navigational skills and experience. Entry is day only for £5 and teams may enter free.

A 9 mile fell race with about 2,800 ft of ascent visiting Tal y Fan and Moel Lus, featuring five ordered checkpoints and a cut off at CP2. Entry is limited to 100 and online registration opens 1/6/26.

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