The north face is a more serious alpine route than the normal glacier ascent. It is a snow and ice climb whose difficulty depends strongly on conditions and season. The line is exposed to objective hazards such as avalanche risk, unstable snow, and possible ice sections. It is suitable only for experienced mountaineers comfortable with route-finding and steep alpine terrain. Because conditions vary greatly, the practical difficulty can change substantially from one season to another. It is a documented mountaineering line on the mountain, but it is not the standard ascent.
Route Outline
Approach the north side of Grande Sassière
Climb the north face snow/ice terrain
Gain the upper slopes or ridge near the summit
Reach the summit of Grande Sassière
Descend by the chosen descent line