Saturday 2nd July 2022
at 00:00 (UTC +01:00) Europe/London

End: Saturday 2nd July 2022
at 00:00 (UTC +01:00) Europe/London

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About the event

This is one of the toughest "half marathon" routes in the UK, and probably the most awe-inspiring. The route takes you through ancient woodland, past stunning glacial lakes, historic trails, and challenging mountainous terrain, including the summit of one of Snowdonia's most iconic mountains, Cadair Idris.

This is a mountain race.


Distance: 13.1 miles

Height Gain: 1150m

Men's Course Record: 2h 10m 40s​ (Richard Shephard, 2021)

Women's Course Record: 2h 42m 09s (Melanie Funnell, 2021)


Starting from the Tyn-Y-Cornel Hotel the route follows a country track along the north side of the stunning glacial ribbon lake, Tal Y Llyn, before entering the Cadair Idris National Nature Reserve.

​You will run through the tranquil woodland of Dol Idris and then up steeply through the wooded gorge. As you ascend out of the trees you will clasp glimpses of the stunning glacial lake Llyn Cau to your left. You will continue your ascent towards Mynydd Moel before traversing west and ascending to the summit of Cadair Idris, 893m. 

The section between the 4km and 6km mark involves steep ascent. The most challenging underfoot terrain is just after the summit of Cadair Idris. 

Once off the rocky terrain of the summit your descent will follow the established Pony Path before turning south west down towards Tyn Y Fach and Mary Jones' Chapel. You will then follow a beautiful section of the Mary Jones walk before traversing North East through tranquil woodland tracks back to Tal Y Llyn and the Tyn Y Cornel Hotel for some well earned rest.


For 2022 we've set the wheels in motion with a local farmer for field parking and camping! Details to follow asap.


Further details about registration and the start will follow but here are the basics:

08:00 - 09:40 - Registration

10:00 - Race start​


There will be water & nutrition available at CP3, CP4 & CP5

CP1 - Left before Mynydd Moel & Cut-off point (6km)

CP2 - Summit of Cadair Idris (8km)

​CP3 - Turn off from the Pony Path (10km)

CP4 - Mary Jones Chapel (16km)

CP5 - Forest (19km)

It is paramount that no litter is left on the route. If you are using your own nutrition please carry out wrappers. Any participant seen deliberately littering will be disqualified and banned from future events.


Cadair Idris Accommodation, Caban Cadair Idris, Dolgellau, UK, LL40 1TS