Marathon Eryri

25 October 2025

Start Time : 10:30 a.m.
Number of Places : 2,700

The Marathon Eryri, previously known as the Snowdonia Marathon, is a much-loved race, having been voted best marathon in the UK by Runners World Magazine in 2007 and 2011. At the same time it is also widely regarded as one of the most difficult marathons.

Marathon Eryri Route
The race takes place in some of north Wales's most spectacular scenery while encircling Snowdon. Runners are advised to consider the cold they may experience during the race and carry body cover with them.

The race, starting just outside of the village of Llanberis, is challenging from the very start. Runners turn onto the hilly A4086 after a traffic-free 3 mile stretch on the the ancient Nant Gwynant road, towards Pen-y-Gwryd.

Runners then have a spell of respite. The routes takes them along the A498 to Beddgelert (200ft) from where they continue along the A4085 to Waunfawr. It is then a rapid climb up to Bwlch y Groesa at about 1,200ft before heading downhill to the finish line in Llanberis.

Marathon Eryri Entry
* Unaffiliated Runners : £50
* UK Affiliated Runners : £48
* Registration Deadline : A ballot will run, presumably in early December. Results will be revealed on January 1st.
* Charities : The race supports Tenovus Cancer Care.

Contact Information
Contact : Jayne Lloyd
Address : Tyddyn Cae, Pontrug, Caernarfon, Gwynedd, LL55 2SW, Wales / Cymru
Tel. : +44 (0)7881 578105
Email : info@marathoneryri.com
Website : https://www.marathoneryri.com/