The GR4 trail runs through Caussols. Starting from the village (signpost #30), we headed north first along a paved road, then along a good and recently maintained trail. We passed several fenced pasture areas which all were empty. We came under the steep southern ridge and headed northeast. The region consists mostly of limestone and we walked past some peculiar rock formations and sinkholes, avens.

We came to signpost #50 where the GR4 continued northeast to Cipières, and another trail straight east to the nearby observatory. We forked left (west), and ascended in open terrain towards the summit along a yellow-marked trail. There were many parallel paths and tracks.  

The summit (highest in Calern) was marked with a large cairn. We could see parts of Nice, the airport as well as the coast to the west, well beyond the St Tropez peninsula.

We took the same trail back to Caussols. It is possible to make a detour to the observatory or even to Colle de Rougiès.