Moderate hike. Good fitness required. Mostly accessible paths. Sure-footedness required. The starting point of the route is right next to a parking lot.

Last updated: December 4, 2025

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Your route passes through a protected area

Please check local regulations for:

Parc naturel régional de Chartreuse

Waypoints

Start point

Parking

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4.69 km

Habert de Billon

Highlight • Mountain Hut

It seems that this habère is the largest sheepfold in Chartreuse which could accommodate more than 100 cows and store the hay accordingly...source "croquerando.com/Blog-aquarelle-montagne.c/b23021a/Le_habert_de_Billon_Chartreuse".. If more information, please let me know.

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6.26 km

Picknick spot close to the Col de la Ruchère

Highlight • Other

If you walk from the Col de la Ruchère down to the Habert de Billon, there's a perfect picknick spot just under the col, at the edge of the woods.

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6.65 km

Ruchère Pass

Highlight • Mountain Pass

Also worth the climb if you do not continue to the Petit Som or the Grand Som. The view down the valley of Saint-Bruno, with the Charmant Som at the opposite side is pretty good.

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8.35 km

St Bruno's chapel

Highlight • Other

8.46 km

Our Lady of Casalibus

Highlight • Other

A larger chapel that you can look into and an outbuilding where the signposts are. From here a short path leads to another chapel. From there you have to turn around to get on the path.

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9.22 km

Direction sign

Highlight • Other

10.4 km

Grande Chartreuse Monastery

Highlight • Historical Site

La Grande Chartreuse, the Great Charterhouse, is the mother monastery of the Carthusian Order. It is an impressive and unique facility. It cannot be visited, but you can walk around …

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11.2 km

Vallon du Monastère Tree-Lined Path

Highlight • Trail

Magnificent avenue of century-old ash trees. Unfortunately, as of 2022, more than half of them had to be uprooted, almost 2/3 because of Asian fungi dating from 2008 which make …

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12.4 km

End point

Parking

Way Types & Surfaces

Way Types

4.79 km

4.25 km

2.99 km

350 m

Surfaces

8.01 km

3.96 km

242 m

< 100 m

Elevation

Weather

Sunday 1 February

7°C

-1°C

60 %

Additional weather tips

Max wind speed: 5.0 km/h

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Habert de Billon – Ruchère Pass loop from Saint-Pierre-de-Chartreuse

Habert de Billon

Picknick spot close to the Col de la Ruchère

Ruchère Pass

St Bruno's chapel

Our Lady of Casalibus

Direction sign

Grande Chartreuse Monastery

Vallon du Monastère Tree-Lined Path

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