From the road from Carpentras (D5) to Mollans-sur-Ouvèze, take the road to Montbrun (D40) for 1 km, then turn right "Pas du Ventoux".
Follow the Chemin du Domaine then the Chemin de Pierrevon (towards Les Hauts de Pierrevon).
On GPS, indicate the place called Pré du Ventoux.