Starting point: Planina Kuk (1150 m)
Starting point Lat/Lon: 46.2112°N 13.7872°E 
Time of walking: 2 h 45 min
Difficulty: easy unmarked way
Difficulty of skiing: no data
Altitude difference: 420 m
Altitude difference (by path): 450 m
Map: TNP 1:50.000
Access to starting point:
Between Most na Soči and Tolmin we notice signs for the village Poljubinj, which direct us to a side road, along which we soon arrive at the mentioned village. We continue driving on an ascending road, which a little higher brings us to the village Ljubinj, where we continue left in the direction of the Koča na planini Razor mountain hut and Stador mountain pasture. Further we ascend a narrow, steep and asphalted road, which higher brings us to the spot where the road towards the Koča na planini Stador mountain hut and Kobala take-off site branches off sharply to the right. Here we continue straight, further to the Lom mountain pasture we drive without major changes in altitude. Behind the Lom mountain pasture we follow the signs for the Koča na planini Razor mountain hut, we however drive on the road which mostly ascends transversely towards the right to the marked parking lot located before the Kuk mountain pasture. Further driving is forbidden.
Path description:
From the parking lot we continue on the road closed to public traffic, on which we quickly arrive at the mountain dairy on the mountain pasture Kuk (also Podkuk). Behind the mountain dairy the path starts to ascend moderately towards the right, at the left bend (serpentine), the geological trail (also the path from Kneške Ravne) joins us from the right.
We continue left and quickly arrive at the junction, where the path to Žabiški Kuk (also Žabijski Kuk) - path past Gradič (old military path) branches off to the right.
We continue in the direction of the Razor mountain pasture and continue on the easy macadam road which crosses the western slopes of Žabiški Kuk. On the road, from which we occasionally get a nice view towards the northwest, where we see Rdeči rob, Vrh nad Peski, Grušnica, Tolminski Migovec and other surrounding mountains, and after approximately 25 minutes of further walking we arrive at the place where the signs for the mountain hut direct us right onto the path which ascends transversely above the road. Only a few minutes of walking follow and the path brings us to the Koča na planini Razor.
We bypass the hut on the right side, then continue in the direction of Tolmin and Krn. A gentle descent follows on the partly concrete road, when the road turns left towards the nearby cheese cottage, we go slightly right onto the marked footpath in the direction of the Planina na Kalu mountain pasture and Krn. An easy walk follows on the expansive and scenic Razor mountain pasture, the path also turns somewhat to the left, so the path leads us towards the west. The easy path first leads us with nice views on Grušnica and Tolminski Migovec, when we reach the edge of the mountain pasture, a nice view also opens towards Tolmin. From the edge of the mountain pasture the path turns right and enters the forest, through which it occasionally descends gently. A little further the path brings us to the lower edge of the cliffs of the Kopecko peak, followed by crossing an alpine hollow. On the other side of the hollow the path returns to the forest, from the left the less trodden path from Tolminske Ravne joins (the path which from Tolminske Ravne leads directly towards Škrbina), a little further we arrive at the well-marked junction.
We continue right in the direction of the Planina na Kalu mountain pasture and Krn (straight Tolminske Ravne and Spodnji Kal mountain pasture) and begin to ascend more steeply, mostly through the forest. After 15 minutes of ascent we arrive at the next junction, where we choose the left path (right Škrbina and Vrh nad Škrbino). The path ahead levels out and gradually brings us out of the forest. A gentle transverse ascent towards the left follows, increasingly beautiful views open from the path. When the belt of dwarf pines ends, we arrive at the Planina na Kalu mountain pasture, we walk to the nearby huts.
From the saddle, from where a nice view opens towards the Tolminka valley, Vrh nad Peski, nice is also the view on the peaks above Tolminske Ravne, which we have occasionally seen already during the ascent, we continue slightly left of the Grušnica ridge, on the nicely traceable path. After a shorter transverse ascent we reach the eastern ridge of Grušnica, from where a nice view opens towards the south. Here the path turns somewhat to the right, then brings us in a few minutes of increasingly scenic walking to the scenic summit, from which a nice view opens on the surrounding mountains.
Starting point - Koča na planini Razor 1:00, Koča na planini Razor - Planina na Kalu 1:30, Planina na Kalu - Grušnica 0:15.
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