Le Petit Som

This easy hike in summer becomes more difficult with the onset of winter conditions. A few centimetres of snow are enough to cover the markings on the ground and make it harder to progress on the steeper sections.
This hike can be done in half a day from mid-November onwards, but don't set off after 2pm, otherwise you'll need a head torch for the return journey.

Details

44636
Creation:
Last update:
Last review:
  • Walking
    Activity: Walking
  • ↔
    Distance: 7.32 km
  • ◔
    Average duration: 3h 55 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 639 m
  • ↘
    Descent: - 639 m

  • ▲
    Highest point: 1,760 m
  • ▼
    Lowest point: 1,129 m

Photos

Description of the walk

Go to the Ruchère resort, then to a place called Le Habert at an altitude of 1,150 metres.

(S/E) Take the wide path that leads to the Col de la Ruchère.
At an altitude of 1,200 m, cross a slight plateau curiously called the car park. A little higher up is the Oratoire Teste de Lavines, which leads to the pass at an altitude of 1,400 m.

(1) Take the path heading east. After a few hairpin bends, a signpost offers you the choice of reaching the Pas du Loup or the Petit Som in 45 minutes.

(2) We chose the latter option, mainly to avoid the steep, snow-covered gully on the way up, where it is essential to watch your step in the snow as any slip in this area could have serious consequences. It is not forbidden to use your hands for support.

(3) At the exit of the gully, head north and after 5 minutes you will find the Petit Som and its metal cross
Enjoy the scenery, including Dent de l'Ours, Grand Som, Chamechaude and the majestic Mont Blanc.

(4) Return to the exit of the Goulet.

(3) Descend to the left to the Col de Léchaud at 1,704 m.

(5) From the pass, head south down into the valley to reach the Pas du Loup at 1,550 m.

(6) Cross the Pas du Loup via a short climb, then a slightly more tricky descent that is best negotiated by downclimbing.
The trail then continues gently downhill until you reach the signpost you passed on the way up.

(2) The rest of the route is now familiar, as it is the reverse of the ascent. Head back to the Col de la Ruchère and then it's the final descent through the forest to the car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 1,132 m - Le Habert
  2. 1 : km 1.72 - alt. 1,390 m - Col de la Ruchère
  3. 2 : km 2.48 - alt. 1,525 m - Directional sign at the junction of the loop
  4. 3 : km 2.98 - alt. 1,742 m - Exit from the narrow pass
  5. 4 : km 3.26 - alt. 1,742 m - Petit Som (1772m)
  6. 5 : km 3.75 - alt. 1,701 m - Col de Léchaud
  7. 6 : km 4.38 - alt. 1,575 m - No wolves
  8. S/E : km 7.32 - alt. 1,132 m - Le Habert

Notes

A frozen drinking trough at Col de la Ruchère! For this 4-hour hike, bring a thermos of hot drink.
Wear good shoes and warm clothing, and bring gloves.
Don't go alone; in pairs or groups, you can help each other out on tricky sections with snow.
Hike done with "Astre" on 13/11/2013.

Worth a visit

There are many opportunities for hiking, skiing or snowshoeing in this area of Chartreuse.

Reviews and comments

4.6 / 5
Based on 23 reviews

Reliability of the description
4.5 / 5
Ease of following the route
4.6 / 5
Route interest
4.6 / 5
Jumanjee
Jumanjee

Overall rating : 4.7 / 5

Date of your route : Jul 16, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A very beautiful hike with a significant elevation gain, especially towards the end. The passage between the "chimneys" of the Petit Son is challenging.
Magnificent view from the summit

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supachipette1
supachipette1

Overall rating : 4.3 / 5

Date of your route : Aug 13, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : Yes

Nice walk from La Ruchère; no particular difficulties (except for the last steep climb just below the summit for beginners)
A fairly effective and steep climb, with lovely views and a great descent through the forest! Well shaded in summer.
For us, barely 600 metres of elevation gain

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lou229
lou229
• Edited:

Overall rating : 4.7 / 5

Date of your route : Oct 16, 2022
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A lovely walk with magnificent views from the top, but not recommended for those who suffer from vertigo.

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Lioneldu69
Lioneldu69

Overall rating : 4.7 / 5

Date of your route : Oct 31, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : Yes

Belle au Petit Som....
Very strong wind that day

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bray
bray
• Edited:

Overall rating : 5 / 5

Date of your route : Sep 13, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A very beautiful walk with a lower section through woodland and above the Col de la Ruchère, which has a more mountainous feel. The narrow passage to reach the summit requires the use of your hands, but it is not difficult and there is no vertigo. The view from the summit is magnificent and we were lucky enough to see Mont Blanc very clearly.
This walk is best done in dry weather.

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Peter410
Peter410

Overall rating : 4.3 / 5

Date of your route : Aug 21, 2021
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Hike mostly through forest (pleasant in warm weather).
Physically demanding hike on the climb up to the chimney.
There is no description of the difficulties involved. So we discovered a difficulty that was entirely personal to us. A brief description would be helpful, with photos. An update would be necessary.
The passage through the chimney is not difficult to climb for people who are reasonably fit. No vertigo. You need to use your hands. Quite nice to do. 10-15 minutes of climbing with short breaks.
The view is extraordinary. We descended via a different route.
The descent via the Col du Léchaud is not very pleasant, with lots of roots and slippery ground. Slow descent.

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FlickaPatsy
FlickaPatsy

Overall rating : 5 / 5

Date of your route : Jun 15, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A very beautiful hike, which we modified slightly on the way back to take in some different landscapes. It's a shame that the end of the hike is on tarmac for a few kilometres.

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M13I9C3H8
M13I9C3H8

Overall rating : 4.7 / 5

Date of your route : May 09, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Hike unfinished on 9 May 2021 due to heavy snow blocking the last couloir before the Frey Pass.

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sabine.berthet
sabine.berthet

Overall rating : 4.7 / 5

Date of your route : Aug 17, 2020
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

a very beautiful hike with varied landscapes (forest, mountain pastures, beautiful views of the Chartreuse mountains and more). The short climb to the Petit Som is quite steep.
Nevertheless, the proposed loop makes the hike very accessible. Total walking time: 3 hours

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Boutarin
Boutarin

Overall rating : 5 / 5

Date of your route : Jul 05, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A lovely loop trail that leads to a stunning view at the end: Mont Blanc, the Carthusian monastery...
Highly recommended and accessible for a family hike.

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EtienneF38
EtienneF38

Overall rating : 4.7 / 5

Date of your route : Jun 02, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A beautiful hike offering access to a lovely viewpoint over the peaks of the Chartreuse.
Most of the hike takes place in the forest, which makes the emergence into the mountain pastures at the Col de la Ruchère even more striking. Access to the summit via the chimney, although not particularly difficult, is impressive and somewhat exposed.
For the return trip, we opted for the path that branches off to the left at the Col de Léchaud and takes you back to the starting point in a complete loop.

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dontaine
dontaine

Overall rating : 4.3 / 5

Date of your route : May 31, 2020
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

you can either take a turn before the main peak or from the peak but to the left... otherwise, it's a very beautiful descent. The return via the Pas du Loup is a little tricky for those prone to vertigo (but it's doable!)

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mathart
mathart

Overall rating : 4.3 / 5

Date of your route : Jan 19, 2020
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good

The gully is shaded and steep. Bring an ice axe and crampons. It is often frozen.

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skyppyy38360
skyppyy38360

Overall rating : 5 / 5

Date of your route : Sep 27, 2019
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good

Hello!
In my opinion, the appeal of the "very good" route is even greater in good weather like today!
It seems to me that the Petit Som is becoming a must-do hike in the Chartreuses, provided you have strong legs and aren't afraid of climbing the chimney (we used our hands to help us)
It's a bit tricky for children, though. The descent has a few difficult metres ("downclimbing" as someone said... one section is protected from the drop by a rock frame, which is actually quite fun to climb down, but the other is quite close to the steep slope at that point)
It's still quite tricky.

But if you have a group of motivated hikers who aren't bothered by the false sense of vertigo you get in the chimney, or during the short section on the wolf side where the rock slopes away, forcing you to lean out over the edge, it's fine.
In good weather in summer, it's impossible not to go up there in the morning to touch the Mont Blanc massif, flirt with the Chartreuse line facing Belledonne, and see Lake Bourget as we did. And behind you can see the Monts du Lyonnais!

What a fabulous view!

Thank you to the visorandonneur for this real gift!!

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louis3838
louis3838

Overall rating : 5 / 5

Date of your route : Sep 02, 2019
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good

a difficult finish but so beautiful at the end, highly recommended

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