By car :
Take Highway A8 (if arriving from Aix en Provence, Monaco or Italy), then take the Saint Isidore exit, then the N202 towards Digne. Next, at about 30 KM, take the junction for Auron.
During the summer only, you can use the Grandes Alpes route by the Restefond / La Bonette pass, which is the road with the highest elevation in Europe (2860 meters).
In both summer and winter, there are 2 regular buses available, that leaves the Nice bus station in the morning and afternoon. They stop at the SNCF train station and also at the Nice International Airport.
