Marathon Eryri
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Oct 30, 2027
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Marathon Eryri, long known in English as the Snowdonia Marathon, is a road marathon around Yr Wyddfa (Snowdon) in Eryri National Park, North Wales, held on a Saturday in late October. It starts just outside Llanberis and finishes on Llanberis High Street. The route climbs the A4086 through the Llanberis Pass to Pen y Pass, which the organiser puts at about 1,100 feet, then drops towards Pen-y-Gwryd and Beddgelert on a course that includes an old road and a farm-track section. It loops back through Waunfawr to the steepest climb of the day, up to the high point of about 1,233 feet, before a steep descent into Llanberis. The race was first held in 1982, the idea of local man Ken Jones, who worked with John Disley and Chris Brasher, the co-founders of the London Marathon. The National Trust ran it from 1984 until 2007, when a community non-profit company, Snowdonia Marathon Cyf, took it over, and in 2023 it became known as Marathon Eryri. The 2026 edition was cancelled because of storm conditions on the course, and entrants' places were deferred to the following edition.
Typical climate for the race month — an estimate, not a forecast or a race-day record
October in the Snowdonia hills is cool and wet: average highs are around 13°C and lows around 7°C, with rain of 1 mm or more on about 19 days of the month (figures from the Capel Curig station, a few miles east of Llanberis).
Llanberis
Local man Ken Jones believed that a race like the first London Marathon, held the year before, could work in Eryri. He worked with John Disley and Chris Brasher, the co-founders of the London Marathon, and staged the first Snowdonia Marathon in 1982. He organised it again in 1983 before handing it to the National Trust in 1984.
The 2026 edition was called off the evening before the race. The organisers said the forecast had worsened considerably after a week of difficult weather and that they had to put safety first, including that of marshals who can be out on the course for over eight hours. They said they intended to defer all runners' places to the 2027 race.
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