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Eryri by UTMB

14 May 2027 to 16 May 2027 · Llanberis, United Kingdom

Enter on the race website
100 miles163 km · 101.3 mi, also 108K, 78K, 56K, 25K
Trailterrain
9,712 m31,864 ft climbing
13°C55°F, typical on the day

Most of the races start in Llanberis at the foot of Yr Wyddfa, and the 78K starts in Caernarfon. The 100 miles loops through Eryri National Park with 9,200 metres of climbing, over technical trails, exposed ridges, rock scree and boggy moorland, and passes through Capel Curig, Dolwyddelan, Blaenau Ffestiniog, Beddgelert and Rhyd Ddu. Aid stations serve food and drink and have toilets and shelter, and larger ones add hot food. Time limits run from 48 hours for the 100 miles down to 5 hours 30 minutes for the 25K.

Route from Eryri by UTMB.

Map © Mapbox © OpenStreetMap.

The Running Algorithm isn't affiliated with this race's organiser. Check the official site for the latest details.

Elevation

0 km20 km40 km60 km80 km100 km120 km140 km161.2 km / 100.2 mi

Typical weather

13°C55°F average
40%chance of rain
15 km/h9 mph wind

Historical averages for this place and date.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.

What could you run here?

Get a predicted time for this course from a recent race result.

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