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 fell race of 8.7 km with 700 m ascent around Moel Siabod, partially marked and requiring navigation. Entry on the day is £5 and junior races are included as part of the Capel Curig Village Festival.

A coastal trail event from Glan Y Don Beach to Tŷ Newydd Campsite covering around 50 km of beaches, trails, woodlands and fields with about 1,000 m of ascent. Entry includes a T shirt, finisher medal and event support.

Trail races in Llanberis, Eryri Snowdonia offering 10K, half marathon, marathon and a 57 km ultra, with routes via Rhyd Ddu, Beddgelert, Nant Gwynant, Pen y Pass and Yr Wyddfa and chip timing.

A continuous guided route over all 14 Welsh 3000 ft peaks in Snowdonia covering about 50 km and 4,000 m of ascent. Options include a guided 20 hour attempt or a 2 to 3 day itinerary with low ratio guiding and staffed refuelling points.

Add Event
Help us complete the calendar!
  • Distance is at least 5 km
  • Event has a website or Facebook page
Website
Optional: Please provide your e-mail address if we may contact you.
Report a change
We will only update the data if the information is also on the website.