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Boucle du Grand Som

Sport, Pedestrian sports, Hiking itinerary in Saint-Pierre-de-Chartreuse
15.8 km
8h
Very difficult

  • A loop at the foot of the Grand Som and around the
    the Grande Chartreuse monastery, via the summit of the Petit Som
    and Notre Dame de Casalibus. Possibility of completing the loop
    to the summit of Grand Som and back.

  • .Useful numbers:
    Weather (essential to check before departure): 3250 or www.meteo.fr
    Mountain Rescue: 112

    Information / Safety:
    For a safe and enjoyable hike, it’s important to follow a few basic rules and tips. Check our recommendations and advice before heading out at chartreuse-tourisme.com/conseils-rando-trail (or ask at local tourist offices).
    Did you know? A mountain guide is an expert in mountain wildlife and plants, off-the-beaten-path hikes, local history, Alpine traditions,...
    .Useful numbers:
    Weather (essential to check before departure): 3250 or www.meteo.fr
    Mountain Rescue: 112

    Information / Safety:
    For a safe and enjoyable hike, it’s important to follow a few basic rules and tips. Check our recommendations and advice before heading out at chartreuse-tourisme.com/conseils-rando-trail (or ask at local tourist offices).
    Did you know? A mountain guide is an expert in mountain wildlife and plants, off-the-beaten-path hikes, local history, Alpine traditions, and more. They ensure a safe and enriched experience! Find a detailed list of guides at chartreuse-tourisme.com/accomp (or ask at tourist offices).
    Please note: You hike under your own responsibility. Chartreuse Tourisme and tourist offices are not liable for the suggested routes.
  • Guidebook with maps/step-by-step
    Steps of the itinerary : La Correrie > Parking Randonneurs > Sous Mauvernay > Sur Bourdoire > Altitude 1530m >
    Habert de Bovinant > (Col de Bovinant > Grand Som > Col de Bovinant > Habert de Bovinant) Col de Léchaud > Petit Som > Alt. 1530m - Sous Petit Som > Col de la Ruchère > Bourdoire > Noutre
    de de Casalibus > Le Réservoir > Habert de Billon Aval > Habert de Chartroussette > Le Vallon du Monastère > La Correrie

    The trail begins at the end of the parking lot. Follow the GR9 (marked in white and red) towards "Habert de Bovinant." Take the path that veers off to the right immediately.

    (1) At Habert de Bovinant, follow the signs for "Le Grand Som."

    (2) From here, the route is an out-and-back trail. At the Col de Bovinant, turn right and follow the yellow markings up to the summit (approximately 2 hours for the round trip, with some technical sections). To descend, return to Habert de Bovinant.

    At Habert de Bovinant, follow the signs for "Petit Som"

    (3) and then to Col de la Ruchère. For an easier and more direct descent, continue to follow the path to Bourdoire, then Le Réservoir, and Habert de Chartroussette.

    At Col de la Ruchère (4), follow the signs for "Bourdoire." At Bourdoire (5), follow the signs for "Le Réservoir." You can also make a round trip to Chapelle St Bruno from the sign for "Notre Dame de Casalibus."

    At the "Réservoir" (6), follow the signs for "Habert de Chartroussette."

    Finally, at Habert de Chartroussette (7), follow the signs for "La Correrie."
  • Departure
    Saint-Pierre-de-Chartreuse
  • Difference in height
    1290.53 m
  • Plain text period
    From 01/05 to 31/10.

    Subject to favorable weather.
  • Spoken languages
    • French
  • Documentation
    GPX / KML files allow you to export the trail of your hike to your GPS (or other navigation tool)
  • See all reviews
1291 meters of difference in height
  • Maximum altitude : 1749 m
  • Minimum altitude : 825 m
  • Total positive elevation : 1291 m
  • Total negative elevation : -1291 m
  • Max positive elevation : 367 m
  • Min positive elevation : -433 m
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