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Car Trail:Bwlch y Groes Mountain Pass at Dinas Mawddwy

Car Trail, free entry

Bwlch Y Groes Mountain Pass

Bwlch Y Groes Mountain Pass

COVID-19 Coronavirus: You are advised to check opening times, special requirements and pre-booking options before you travel


Bwlch y Groes (Pass of the Cross) is one of the highest public road mountain passes in Wales. The route lies on minor roads linking Dinas Mawddwy, Llanuwchllyn and Lake Vyrnw with views across the Dyfi valley and Cadair Idris

The route was part of the pilgrim's ropute from North West Wales to St David's in South Wales. A cross, which can be found just below the summit at the junction of the roads from Vyrnwy and from Dinas Mawddwy, was placed on the route as a symbol of faith and strength comforting travellers since medieval times.

Bwlch y Groes was used between and after the wars by the Austin Motor Company and the Standard Triumph Motor Company to test prototype cars and their performance during hillclimbing.

The British Motorcycle industry which was world beating before the wars also used the pass for testing. In 1926 BSA undertook a continual test resulting in the company being awarded by the Auto-Cycle Union the Maudes Trophy for 60 ascents of the pass. BSA won the award again in 1938 in relation to rides that took place including the Bwlch y Groes.

Cycling the route is definitely not for the faint hearted! The southern ascent of the Bwlch y Groes is approximately 1.7 miles (2.7 km) long with severe gradients throughout (steepest 1 in 4). In the 1970s and 80s this was the most challenging climb used in the Milk Race round-Britain cycle race. The ascent is included among the hundred greatest cycling climbs in Britain, being a remorseless ascent of 350 metres over a distance of just over 2 miles.

Drive Route: Dinas mawddy - Llanuchllyn - Lake Vyrnwy


Free entry


Marketing - Towns & Railways


LL49 9LP



Plan route to Dinas Mawddwy using Google mapsPlan route using Google maps

Map reference: SH 858147  Lat: 52.71870 Long: -3.69102

A458 from Welshpool; right at Mallwyd onto the A470 Dolgellau road.

Parking: free

Accessible by Public Transport: 13 miles from Machynlleth station