Parking in the hamlet of Les Chazes, which is on the left of the road from Saint-Jacques-des-Blats to the Super-Lioran resort.
Much of the route is marked in yellow. There are signposts at intervals and a few cairns at the base (south-east) of Puy Griou. There are no markings on the final ascent, but the route is clear.
(S/E) Head west and follow the small road towards Les Chazes Petites.
(1) After passing a house, take a path that climbs steeply to the right. Follow a few hairpin bends and you will come to a wider path.
(2) Take the path on the left (west) and climb more gently up the mountainside. Stay on the main path and ignore the paths that branch off to the left or right. You will come to another fork.
(3) Then take the path on the right towards Vacherie du Griou and climb up the switchbacks.
(4) Shortly before reaching the Vacherie du Griou, turn left onto a path. This will take you to an area of shrubbery. Head north, then north-northeast, through the scree coming from the Puy Griou. Climb up to a nameless pass at the base of the Puy.
(5) Climb the summit section on a very steep and poorly marked path through the rocks (you may need to use your hands at times).
(6) The descent follows the same route as the ascent to Les Chazes (S/E).
In wet weather or strong winds, be careful or even abandon the climb.