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From the N85, 500 metres north of Col Bayard, a small road branches off to the left towards the west (wooden sign) towards Col de Gleize, where you will find the Col de Gleize car park: park there.
(S/E) Start at the far end of the car park, heading south-east, go through the barrier and follow the yellow markings.
Climb up through the larch trees, ignoring the forest track that follows the contour line and the small path that descends.
At first, the path runs alongside the forest track, but above it. Very quickly, it climbs in zigzags through the forest.
When you leave the forest, there is no alternative route and you must follow the ridge line. The peak is opposite, so continue straight ahead and keep climbing. The path is quite steep as there are no more switchbacks. You will come out at the Pic de la Greysinière.
(1) There is a beautiful view of the Chaudon mountain and, further west, the Pic de Bure. Opposite is the Champsaur.
Caution: from this peak onwards, the hike becomes exposed, as the trail is located on a ridge. The slope is very steep on both sides and the trail constantly switches from one side to the other. You may need to use your hands at times. Follow the yellow markers, which indicate the easiest passages.
This hike is therefore not recommended for those who are afraid of heights.
Reach the end of the tricky section.
(2) Stay on the ridge (end of the aerial passage) and reach the Col de la Côte Gelée.
(3) Continue along the ridge, passing the 1761 metre peak where there is a barely visible fork that allows you to either veer slightly to the left to stay on the ridge, then climb slightly to reach the Col de Guizière (option shown on the map) or stay on the path to the right to avoid the climb.
Either route will take you to the Col de Guizière.
(4) Begin a short climb up Côte Plaine, where you will see a telephone relay tower. From here, there are beautiful views of Gap. To help you explore the area, the local council has installed an orientation table.
Continue downhill towards the Brèche de Charance and join it.
(5) Do not descend, but turn right at the hairpin bend and head north on a path that goes around Côte Plaine on the Dévoluy side and returns towards the Col de Guyzière. You will arrive near the pass, but below it.
(6) Turn left towards a small valley. The path quickly becomes less visible as it is not frequently used. There is a green round marker. In any case, always keep the bottom of the valley on your right.
Enter a forest where the path descends; the bottom of the valley is less visible, but you can still make it out below on the right. Reach a junction with a track.
(7) Turn right. Cross the stream; the wide track ends abruptly. Turn left onto the path. Go around a small hill on the left. From here, there are two types of markings: round orange dots and yellow rectangles (PR®). Stay on the western side. You will reach another junction that is not very visible.
(8) Keep right on the larger path and continue climbing to reach a new crossroads marked by a cairn.
(9) Continue straight ahead northwards to return to the Col de Gleize and the car park (S/E).
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