Le Petit Som

This walk, which is easy in summer, becomes more challenging with the onset of winter conditions; just a few centimetres of snow are enough to obscure the markings on the ground and make progress more difficult on sections where the slope is steeper.
This hike can be done in half a day from mid-November onwards; do not set off after 2 pm, otherwise you’ll have to make your way back by headlamp.

Details

n°44636
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  • Walking
    Activity: Walking
  • ↔
    Distance: 4.55 mi
  • ◔
    Average duration: 3h 55 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 2,096 ft
  • ↘
    Descent: - 2,096 ft

  • ▲
    Highest point: 5,774 ft
  • ▼
    Lowest point: 3,704 ft

Photos

Description of the walk

Head to the Ruchère ski resort, then on to a place called Le Habert at an altitude of 1,150 m.

(Start/Finish) Take the wide path leading to the Col de la Ruchère.
At an altitude of 1,200 m, pass over a slight plateau curiously known as ‘the car park’; a little further up is the Oratoire Teste de Lavines, before emerging at the pass at an altitude of 1,400 m.

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

(2) We’ll opt for the latter, mainly to tackle the steep, snow-covered narrow pass on the ascent, where it’s essential to tread carefully in the snow, as any slip in this area could have serious consequences. It’s perfectly acceptable to use your hands for support.

(3) Upon exiting the gully, head north and, after 5 minutes, you’ll reach the Petit Som and its metal cross
Take in the scenery: the Dent de l’Ours, the Grand Som, the Chamechaude and the majestic Mont Blanc.

(4) Head back towards the exit of the Goulet.

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

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

(6) To cross the Pas du Loup, you’ll need to climb a short way up, followed by a slightly trickier section on the descent, which is best tackled by scrambling down.
The path then continues gently downwards until it reaches the signpost you passed on the way up.

(2) The rest of the route is now familiar; it is the reverse of the ascent. Head for 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 : mi 0 - alt. 3,714 ft - Le Habert
  2. 1 : mi 1.07 - alt. 4,560 ft - Col de la Ruchère
  3. 2 : mi 1.54 - alt. 5,003 ft - Signpost. Junction of the circular loop
  4. 3 : mi 1.85 - alt. 5,715 ft - Exit from the gorge
  5. 4 : mi 2.03 - alt. 5,715 ft - Petit Som (1772m)
  6. 5 : mi 2.33 - alt. 5,581 ft - Col de Léchaud
  7. 6 : mi 2.72 - alt. 5,167 ft - Not a soul in sight
  8. S/E : mi 4.55 - alt. 3,714 ft - Le Habert

Notes

A frozen drinking trough at the Col de la Ruchère! For this 4-hour walk, make sure you take a flask of hot drink with you.
Wear sturdy shoes and warm clothing, and gloves.
Don’t set off alone; whether in pairs or in a group, you can help each other through sections made tricky by snow.
Hike done as a pair with “Astre” on 13 November 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 25 reviews

Reliability of the description
4.6 / 5
Ease of following the route
4.6 / 5
Route interest
4.6 / 5
Mumu 69
Mumu 69

Overall rating : 5 / 5

Date of your route : Aug 15, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A very pleasant walk. Shaded at the start but out in the open afterwards. A good climb up to the gorge, and the passage through the gorge isn’t difficult. You need to watch your step and use your hands for support. There’s also a tricky section leading to the Pas de Loup, but nothing impossible. You need to watch where you put your feet.
The return journey is in the shade along the same path, with a stony descent… there’s a small path on the right (after a few hundred metres) which joins the one on the left and is more pleasant as it’s less stony.

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mariebleuet
mariebleuet

Overall rating : 4.7 / 5

Date of your route : May 11, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Please be aware that there is still loose snow in the gully, and I would advise against doing this hike at the moment

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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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