Best time to hike the GR10

The usual season is late June to mid-September, when the refuges are guarded. Snow often lies on the high passes of the central Pyrenees (Hourquette d'Arre, Hourquette d'Ossoue, the Néouvielle) until late June or early July, so walkers who start in Hendaye in mid-June usually reach them at the right time. July and August are warm and busy, with frequent afternoon thunderstorms; the Basque Country is often foggy, and the Mediterranean end can be very hot. September is quieter, but some gîtes and refuges close in mid- or late September. The Basque and Catalan ends can be walked from April to October.