United Kingdom · 53.1190°N, 4.1290°W · summit 1,085 m (3,560 ft)
Eryri Crucible
Sun · 21 Feb 2027
Llanberis · lakeside basecamp
3 races, one long winter day
Choose your race. The numbers below change with it.
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25K
technical grade 3 / 5True distance
25.6 km
15.9 miles
Vertical gain
+1,150 m
+3,773 ft
Vertical loss
−1,150 m
−3,773 ft
Highest point
726 m
2,382 ft
Technicality
Slate quarry inclines, then Moel Eilio and its three grassy tops. Steep, runnable and very exposed to a westerly.
Elevation profile · 25.6 km (15.9 miles)
Route file & maps
The quarry levels all look alike. Follow the flags through them and the GPX after.
Mandatory kit · checked at start
→
50K
technical grade 4 / 5True distance
50.9 km
31.6 miles
Vertical gain
+2,700 m
+8,858 ft
Vertical loss
−2,700 m
−8,858 ft
Highest point
1,085 m
3,560 ft
Technicality
Over Moel Eilio to Yr Wyddfa by the Ranger Path, down the Llanberis Path. Snow above 800m (2,625ft) most Februaries.
Elevation profile · 50.9 km (31.6 miles)
Route file & maps
A cut-off sits at the foot of the Ranger Path, 22km (13.7 miles) in. Miss it and you take the valley route home.
Mandatory kit · checked at start
→
80K
technical grade 5 / 5True distance
81.3 km
50.5 miles
Vertical gain
+3,600 m
+11,811 ft
Vertical loss
−3,600 m
−11,811 ft
Highest point
1,085 m
3,560 ft
Technicality
The 50K plus the Glyderau: boulder fields, a scramble and a second night for most. For people who have done this sort of thing before.
Elevation profile · 81.3 km (50.5 miles)
Route file & maps
The boulder field on Glyder Fach has no line. Pick your way, keep the cairns in sight, and do not hurry it.
Mandatory kit · checked at start
Runner info pack
Start times, the numbers, the kit lists and the course on a few pages. Print it or save it as a PDF.
Llanberis · lakeside basecamp
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Entry covers your race, the GPX, lakeside camping on Saturday night and soup at the finish. Capped at 300 per race.
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