Allt-fawr
Allt-fawr: The Overlooked Giant of the Moelwynion
Rising above the slate-strewn valleys of Blaenau Ffestiniog, Allt-fawr is a broad, wild summit that offers some of the most underrated views in Snowdonia. Standing at 698 metres, it may not have the fame of neighbouring peaks, but its open ridges and mining-scarred landscape give it a unique and rugged charm.
Slate, Summit & Solitude
Allt-fawr is best known for the surreal contrast it offers, remote, sweeping moorland above, and the industrial history of the Oakeley slate quarries below. From the summit, you’re rewarded with panoramic views over the Moelwynion range, the Rhinogydd, and even as far as Yr Wyddfa on a clear day. It’s a quiet peak that attracts walkers looking to escape the crowds and connect with the raw beauty of Snowdonia’s industrial past and natural present.
Snowdon’s varied routes mean there’s something for everyone, from leisurely walkers to seasoned hikers. Whether you’re taking the popular Llanberis Path or tackling the exhilarating Crib Goch ridge, each ascent is rewarding in its own way. Reaching the summit is not just about the view; it’s about the journey, the effort, and the stories you’ll tell after.
© Brad Carr
Walks & Hikes Around Allt-fawr
Allt-fawr may be one of the quieter peaks in Snowdonia, but it offers a surprisingly wide variety of approaches. Here are some of the best routes to the top:
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Allt-fawr from Blaenau Ffestiniog
- 5 mi
- 3 hrs - 4 hrs
A steep but rewarding climb through slate quarries and old tramway paths, leading to expansive views from the summit.
Allt-fawr & Moel Dyrnogydd Circular
- 6.5 mi
- 4 hrs 5 hrs
A circular route with great views across the Vale of Ffestiniog, passing the quiet neighbouring summit of Moel Dyrnogydd.
Allt-fawr from Llyn Ystradau (Tanygrisiau Reservoir)
- 4.5 mi
- 3 hrs - 4 hrs
A quieter ascent from the reservoir, gradually climbing to the summit with views across the lake and surrounding hills.
Slate Trail Route (Quarry Exploration)
- 6 mi
- 3.5 hrs - 4.5 hrs
This loop focuses on the quarry history of the area, with sections passing Oakeley Quarry and steep paths up Allt-fawr.
Allt-fawr via Rhiwbach Tramway
- 5.5 mi
- 3.5 hrs - 4.5 hrs
An atmospheric route using the old tramway path, offering glimpses of hidden quarry buildings before the final summit climb.
What to Know Before You Go
Though not technical, Allt-fawr’s terrain is often pathless and can be boggy or loose underfoot. Good navigation skills are a must, especially in mist. Bring a map and compass, and prepare for strong winds near the summit. The quarry areas, while fascinating, can be hazardous; stick to established paths and be cautious around steep drops and loose ground.
Why We Love Allt-fawr
Allt-fawr combines the drama of Snowdonia’s mountainous scenery with the fascinating story of its slate heritage. It’s a quieter peak that rewards curiosity, offering solitude, space, and a different perspective on the Moelwynion. Whether you’re here for the views or the history, Allt-fawr delivers an authentic and memorable mountain experience.
How to Get to Allt-fawr
Allt-fawr sits directly above Blaenau Ffestiniog, making the town the best starting point. From the A470, follow signs into Blaenau and park in one of the town centre car parks. The mountain is also easily accessed from Tanygrisiau via Llyn Ystradau. For public transport, Blaenau Ffestiniog has a train station with direct links from Llandudno Junction.
If you’re travelling by public transport, the nearest train station is in Bangor, from where you can catch a bus to Llanberis. Sherpa buses also link the main trailheads, including Pen-y-Pass and Snowdon Ranger.
A Bit of Allt-fawr History
The flanks of Allt-fawr were once a hive of activity, with slate quarrying dominating the area in the 19th and 20th centuries. The nearby Oakeley Quarry was one of the largest underground slate mines in the world. Today, the remnants of that industrial age remain scattered across the hills, blending with the natural landscape to create an eerie, beautiful wilderness.
Keep exploring
Allt-fawr is just one of the many wild summits in the Moelwynion range. After this rugged climb, why not check out nearby peaks like Cnicht or Moelwyn Mawr? More mountain adventures await below.