FATMAP difficulty grade
A long full day expedition line by La Chapelle d'Abondance where you turn left at "Les Combes" ski lift into the gully hiking until the top of the Mont Grange peak "plateau", hike take a full day and need some good skills as steep terrain is present.
Arete is the best option for the hike and skins make it much quicker, however below the summit good climbing skills are welcome due the rock terrain, steepness, avalanche risks.
Line going to be on a long arete joining "Plagne to Plaine dranse line", line exposure is taking a lot of sun so make the weather conditions are good as the avalanche risks is really important there. Line is optional and some other run done if you want to void some steep part, "Plagne to Plaine dranse line" once join bring the expedition to green slope "Les Rubis".