From Monêtier-les-Bains, take the Route des Grandes Alpes towards the Col du Lautaret, then towards the Col du Galibier. Park in the small car park on the right-hand side of the road at an altitude of 2,434 metres, a good kilometre before the Henri Desgranges memorial. This car park is not shown on the IGN map.
(S/E) From the car park at the orientation table, cross the road and walk back up a few metres to the cemented water drainage block.
Go through the electric fence and take the path on the left that climbs up the embankment.
This well-marked path, which is not visible from the road, follows the ski touring route indicated on the IGN map by blue dots.
It climbs gradually and continuously to the north-west in the mountain pasture on the heights of the Vallon de Roche Noire, skirting the scree slopes that descend from the peaks (2826 and 2816) on the right.
On the way up, you will come to a fork and take the right-hand path to keep alongside the scree slopes of the aforementioned peaks. The trail climbs steeply, crossing a series of grassy mounds.
Leave the ski touring route indicated on the IGN map by blue dotted lines.
Rejoin the ridge line and follow it to the left towards the base of the summit bastion (north-west then west).
(1) Gain a foothold on the wide ridge of the peak and follow the dirt trail up a series of switchbacks to reach the summit area.
(2) To return, follow the same route back to the car park (S/E).