From the east today. Cross the road and on the other side take the col du Lauzon trail (S), an outstanding well-maintained large path.
Pleasantly weave through a forest leading to Vallone di Chaud (1) then Levionaz sheepfold (bergeries de la Levionaz).
Go past the chalets (lower (2), middle and higher (3)) then cross the torrent before starting the ultimate climb of the pass.
Remarkably well-placed turns allow you to exit at the highlight of the trek. Col du Lauzon (4) at 3296 m takes you into Val de Cogne.
Head down a windy hillside, then through Lauzon alpine pasture you'll reach refuge Vittorio Sella at 2584 m (6).