Snowdon24

JUL
11
2026
A 24 hours ultra trail event from Llanberis that challenges solo runners or relay teams to ascend Yr Wyddfa as many times as possible. UTMB indexed distances and on course support are provided, with an official charity partner.
Sat 11 Jul 2026
UTMB 50K/100K/100M 100 miles 100 kilometers 50 kilometers

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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.

100 mi
100 Miles
100 km
100k
50 km
50k

Events nearby

A fully waymarked, supported Sea to Summit ultramarathon from Caernarfon Castle to Yr Wyddfa covering 29 miles and 5600 ft ascent.
A guided 13 km loop around Llyn Trawsfynydd in Southern Snowdonia on runnable trails with limited ascent and regular regrouping stops.
Trail races at Newborough Forest and Llanddwyn Island, offering 10k and half marathon distances, chip timing, on course support and bilingual services.
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