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Departure from the Chalet de la Charmette car park, which is above the Col de la Charmette car park accessible via the D105 departmental road, either from Grenoble or from Saint-Laurent-du-Pont.
(S/E) Look for the sign indicating the direction of Col de la Grande Vache. Start on a fairly long scree slope, which will be avoided on the return trip.
(1) At the intersection, keep to the right and do the same at the next intersection to reach Col de la Petite Vache: there are no particular difficulties on this section.
(2) Enjoy the superb view of the mountain and valley. In the distance on the left, you can see the summit of the Grande Sure.
Walk along the rocky ridge and cross the cow pastures on a path used by the ruminants, which is sometimes quite rough. You will reach the Col de la Sure, where several paths intersect.
(3) The pass marks the start of the final climb up the Grande Sure, the most challenging part: a 1 km climb with a 200 m elevation gain over scree and rocks. There are no particular technical difficulties and no danger. Turn right to reach the summit.
(4) Superb view of the Isère valley and the town of Voiron, as well as the Chartreuse.
Return to the Col de la Sure; the descent can be slippery and difficult in wet weather.
(3) Turn right towards Col d'Hurtières and continue for about 450 m to reach a fork.
(5) The direction of Goulet d'Hurtières is not signposted, but the path is very visible as it is the only one going up to the left and the Goulet d'Hurtières passage is also very visible. Take the path on the left that climbs steadily towards the cliff until you reach a passage in the rock called Goulet d'Hurtières.
(6) From there, the path descends into a sparse forest, following several deep chasms.
(7) Turn right to make a circular loop that avoids the scree at the start of the descent and continue to the next fork.
(8) Turn left onto a wide path that leads directly back to the car park (S/E).
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Visorando member
Moderate 
