Gallt Yr Ogof



Gallt Yr Ogof is a 763m mountain in Ogwen Valley near Capel Curig in North Wales, and possibly the best summit in Snowdonia National Park to view Tryfan at sunset.

This post includes two routes:

Route One: a challenging off trail scramble up Green Gulley and a wide open descent back to Capel Curig.

Route Two: in reverse, avoiding the gulleys but including some off trail sections.

Distance Route One: 5.4 miles / Route Two 6.1 miles

Time 2 hours 45 minutes / 3 hours (walking and scrambling)

Total Ascent approx 2,000ft

OS Maps

Route One: click to open the Green Gulley route on the OS Maps website

Route Two: click to open the NO gulley route on the OS Maps website

Summits Gallt Yr Ogof

Views Tryfan, the Glyderau, the Carneddau

Route One

Note Green Gulley ascent on the nose of the mountain.

Gallt Yr Ogof Route One 3D Map

Route Two

Descent adds a dog leg to avoid the gulleys and cross the ferns.

Gallt Yr Ogof Route Two 3D Map



Gallt Yr Ogof buried in cloud from the Capel Curig road side

Gallt Yr Ogof Hiking Loop | thefrozendivide 01



The Glyderau, Tryfan and Pen Yr Ole Wen from Gallt Yr Ogof

Gallt Yr Ogof Hiking Loop | thefrozendivide 02



View out over the Carneddau from the cave on Green Gulley

Gallt Yr Ogof Hiking Loop | thefrozendivide 03




1. Parking for both routes is behind Joe Browns Climbing Shop in Capel Curig. Route One is heading up towards the Ogwen valley on a well kept trail all the way to the road facing side of Gallt Yr Ogof. The valley view is pretty awesome is any weather. The alternative is to take the left hand fork behind the house and begin the mountain path.


2. Ascending Gallt Yr Ogof via Green Gulley (Route One) is not recommended, to make this clear – it’s very steep, wet and boggy and there is no path. We enjoy it because it’s such a bitch, loads of swearing goes on and the calf burn is real here. There’s a little cave to the top left of the gulley, and once Tryfan finally pokes it’s head out on the right hand side there’s a series of irritating false summits before the final peak. It’s horrible really, but some days that’s just what we’re looking for. Route Two continues along the ridgeline, across lots of very wet marshy ground with a final reasonably steep ascent to the top of Gallt Yr Ogof.


3. Watching Tryfan mountain from here is incredible. The light pours across the valley from left to centre through the day, throwing shadows in all directions. Bristly Ridge and the Glyderau to the left look imposing and the Carneddau comes to it’s end with Pen Yr Ole Wen to the right.


4. Descending back to Capel Curig via Route One is a easy case of following the ridge line down – the village is visible on clear days – and we keep Moel Siabod ahead/right as our main marker reference. There’s a long lonely fence on the left and a decent stretch of broken dry stone wall to use as markers in poor visibility. For Route Two we head north from the summit towards Green Gulley, but veer left, using a couple of stiles and a rickety old fence as markers in poor weather. There’s a stretch of wet boggy fern and small boulders before reaching the well marked Capel Curig path and turning right to get back to the car park.



Route One Video Walkthrough


Route Two Video Walkthrough


Tryfan Cloud Inversion Timelapse