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From Briançon, take the D902 towards Col de l'Izoard to Cervières. Turn left onto the D89T or Route des Fonts (signposted, pass in front of the church). This old track is now passable and tarmaced but remains closed to motorhomes. After passing the old farms of La Chau and after a left-hand bend, park about 300 metres from the start of the long straight stretch of the Bourget plain on one of the parking spaces on the right-hand side of the road. The Combe du Lasseron forms a pass that is clearly visible from the road, bordered on the left by the Turge de Peyron and on the right by the Lasseron. Position yourself so that you are in line with the right-hand edge of the combe.
(S/E) From your parking spot, head towards La Cerveyrette and wade across the river (unless it is dry, in which case you will need to wade barefoot, so bring a towel). Follow the river and the base of the scree slope to the east-southeast until you see the uphill path and the first cairns. This path is in line with the left edge of the pass that you can see above you.
(1) Set off along this well-marked path and stay on it. To do this, locate the blue ski touring route on the IGN map. Climb steeply up the south-south-west scree slope before reaching the mountain pastures. At the entrance to the valley (where the slope flattens out), continue in the same direction towards the Col du Lasseron until you are directly below the Crête de la Charvie.
(2) Start turning to the right (leaving the blue route on the IGN map here) about 200m before the latter (at an altitude of about 2418m) and head west-southwest to reach the southern ridge of the peak. Climb up the ridge and, after passing a gap at an altitude of 2,478m, you will see the first cairn, which marks the start of the summit trail.
(3) Head north-northwest across the eastern flank, staying below the southern ridge of Lasseron. Follow it to the summit bastion adorned with a cross (Croix de Sainte-Rose).
(4) Return via the same route you took on the way up.
the chamois were there as expected (the flies too, even though they weren't expected), and the view from the summit is incredible. Crossing the river-footbath is quite fun, but in 2024, with heavy rains and late snow, the marshy area bordering it on both sides is completely flooded and a bit difficult to cross. But that's quickly forgotten. 
Visorando member
Difficult 
