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CADAIR X Half Marathon CADAIR X Half Marathon

CADAIR X Half Marathon

Tywyn, Gwynedd

Ty'n y Cornel Hotel, Tal-y-llyn, Tywyn, UK

Sat 2nd July 2022

Starting at 09:00

Organiser's Description

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.


The Tyn Y Cornel Hotel, Gwynedd LL36 9AJ. ​All participants must have the Hotel number stored - 01654 782 282.

Course Details

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.

the stats

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)


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

08:00 - 09:40 - Registration

10:00 - Race start​

check points

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.

cut off

If you have not reached CP1 within 90 minutes of the event start time you will be asked to turnaround and return to the event start. The summit of Mynydd Moel is around the 6km mark, after 750m of ascent.

This cut-off is in place for the safety of participants and marshals.

compulsory kit

Your usual hill running kit must include:
Waterproof jacket
Insulation layer (eg micro-fleece, down gilet)​
Water bottle/bladder & race-cup
Suitable bag for carrying kit
Fully charged mobile phone
Suitable footwear
Map/GPS + Compass

In the event of severe mountain weather we'll use our Plan B route. It will still be a memorable route of the same distance, but won't go higher than 400m. Participants will be notified in advance.

  • All participants must have the Hotel number stored - 01654 782 282.


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Tywyn, Gwynedd


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