From Briançon, take the D902 towards Col d'Izoard. Drive up to the pass and park after the memorial on the car park on the left-hand side of the road.
(S/E) From the car park, take the path heading north-east towards Col des Portes, marked at its starting point by a wooden sign.
This trail climbs steeply northeast up the hillside and joins the Col Perdu.
(1) Cross over to the other side and descend northwards for about 50 metres.
When you reach a crossroads, take the path on the right that crosses the hillside towards the east, below the Pic Ouest de Côte Belle and then below the Casse des Oules.
Climb gradually, then tackle a slightly steeper ascent before reaching Col des Portes, marked by a cross.
(2) Climb east-northeast, following the cairned path to its end, a distance of 200 metres.
(3) Head east through the scree, following the cairns towards the breach.
There is a tower in the centre of the breach. Go around the tower on the left, follow the cliff and you will come to a knotted rope.
The rope provides access to a ledge about 3 metres above the ground. It is possible to reach this ledge without using the rope by climbing the wall to the right of it.
On the almost horizontal ledge, move right towards the north-east for about 50 metres to the end of the ledge, going around the cliff until you can see the summit and its radio antennas.
Then descend a few metres to reach the corridor on the opposite wall on the left.
(4) Climb up this wall, using the large handholds and occasional small footholds, to reach the summit and the antennas.
Return via the same route in reverse to the Izoard car park (S/E).