Le Grand Som via the Col du Frêt, Le Racapé and the Crête des Aures

A wilder approach to this iconic peak of the Grande Chartreuse, which will require some route finding to reach the starting point.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 10.84 km
  • ◔
    Average duration: 6h 10 
  • ▲
    Difficulty: Difficult

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 1,078 m
  • ↘
    Descent: - 1,071 m

  • ▲
    Highest point: 2,019 m
  • ▼
    Lowest point: 1,035 m

Photos

Description of the walk

After the Col du Cucheron, take the D102b, turn left onto a narrow road just before the hamlet of Les Reys and park at the end of the tarmac road.

(S/E) Take the forest track, which further on becomes a path, and reach a crossroads.

(1) Take the right-hand branch, then turn left to reach a large clearing with a wooden sign at the end indicating the start of the 120 Lacets trail.

(2) Turn right, then after a fairly long traverse, the hairpin bends become tighter and follow one after the other until you reach the Col du Frêt. Some sections require the use of your hands. Reach the Col du Frêt.

(3) Descend and reach the Col de Bovinant.

(4) Take the normal route south on the left, which is the Sentier des Moutons. Follow it to the summit of Grand Som.

(5) Descend eastwards to the start of the Racapé trail, marked by a sign.

(6) Take the path on the left and descend carefully to the Col des Aures.
Be careful here: there is a cable-assisted section before you reach the pass.

(7) Turn left here onto the track and climb up to reach the Crête des Aures. A good path leads to the end of the ridge.

(8) Turn left and descend diagonally into the forest. After two hairpin bends, join a transverse track on the right, which is not very visible at first but becomes clearer further on. Further on, you will reach a crossroads marked by a small cairn.

(9) Take this path on the left and reach the bottom of the valley. Leave the path and take an old forest track on the edge of the national forest, which is barely visible and passes near a forest marker.

(10) Here you have two options:
- Turn right into a narrow, steep and difficult valley that joins the path taken on the way up. (route)
- Turn left to rejoin the trail just before the wooden sign marking the start of the 120-turn trail.

(1 or 2) Retrace your steps to return to the car park in the hamlet of Les Reys (S/E).

Waypoints

  1. S/E : km 0 - alt. 1,035 m - Turning area on the forest track
  2. 1 : km 0.88 - alt. 1,206 m - Crossroads of the circular
  3. 2 : km 1.97 - alt. 1,389 m - Wooden sign marking the start of the 120-turn trail
  4. 3 : km 3.08 - alt. 1,735 m - Col du Frêt
  5. 4 : km 3.58 - alt. 1,652 m - Col de Bovinant (1646m)
  6. 5 : km 5.37 - alt. 2,018 m - Grand Som (2026m)
  7. 6 : km 5.9 - alt. 1,802 m - Sign indicating the start of the Racapé
  8. 7 : km 6.39 - alt. 1,635 m - Col des Aures (1639m)
  9. 8 : km 7.39 - alt. 1,557 m - End of the Crête des Aures ridge
  10. 9 : km 9.3 - alt. 1,359 m - Leave the track and take the path on the left.
  11. 10 : km 9.43 - alt. 1,341 m - Starting point of an old track
  12. S/E : km 10.84 - alt. 1,037 m - Turning area on the forest track

Notes

Hike completed on 9/7/2020 based on an itinerary suggested by Pascal Sombardier in his book Chartreuse inédite.

Reviews and comments

4.7 / 5
Based on 11 reviews

Reliability of the description
4.6 / 5
Ease of following the route
4.5 / 5
Route interest
4.9 / 5
Jeffrey38
Jeffrey38
• Edited:

Overall rating : 4.3 / 5

Date of your route : Oct 28, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Magnificent panorama at Grand Som!

Dry ground is highly recommended for the descent from Grand Som to Col des Aures. The return route through the woods is a little confusing.

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User 13616643

Overall rating : 4.7 / 5

Date of your route : Sep 08, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Superb hike! The summit of Grand Som is magnificent, with the added bonus of a view of the Chartreuse monastery below!
There is a fairly significant elevation gain to reach the Col du Frêt, 700 metres out of the 1,000 metres of the entire hike, but the trail is easy with superb views!

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fletcher_fr
fletcher_fr
• Edited:

To add to my previous post, I would like to mention that at Col du Frêt, it is possible to climb to the summit of Dent de l'Ours, with the difficulty increasing to "Very difficult" and a 100-metre elevation gain. I will be sure to post the route from the pass soon.

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fletcher_fr
fletcher_fr
• Edited:

Overall rating : 4.7 / 5

Date of your route : May 25, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

A beautiful hike through wild countryside at the start. The author's description accurately summarises the difficulties encountered. At point 9, I took a path heading due north, away from the GPS track, I turned back and, slightly upstream, there is a fallen tree trunk below the track, which you avoid by going to the left. This is the start of the path that leads to the intersection with the uphill route, for those who want to avoid the descent to the bottom of the narrow valley.

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Jacques Keller
Jacques Keller

Overall rating : 4.3 / 5

Date of your route : Sep 04, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Hello,
We took this route in early September 2024.
It is truly superb.
However, when done anti-clockwise as indicated in Visorando, the descent from the Col du Grand Som is extremely difficult, with impressive slopes.
We made this descent in the rain: in wet conditions, it is not recommended.
Kind regards. Jacques Keller

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Forney
Forney

Overall rating : 5 / 5

Date of your route : Oct 11, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Magnificent hike, good trails, alternative route for the end of the Grand Som, return via Racapé where I met the first hikers, from the superb Aures ridge alone again, beautiful descending trail, then more confusing, keep a close eye on the GPS and join the trail to the car park.
An unforgettable day.

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olivierdu38
olivierdu38
• Edited:

Overall rating : 4.3 / 5

Date of your route : Oct 29, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

I did this hike in March 2023 and today in wet weather.
The 120 hairpin bends are dizzying, and you need to work hard with your feet to get through all the difficulties, with many sloping passages with regular rockfalls and fairly technical terrain, alternating between slippery ground and checking that the rock is secure.
If you do not wish to climb the Grand Som but stay on the plain, the scree slope before reaching the Pas de la Suifière is dizzying. Although cairns are placed at regular intervals, the path varies depending on the weather and rockfalls, so you need to be sure-footed. Some passages are sloping, running alongside ravines where a fall would be fatal, and there have already been deaths.
The Pas de la Suifière is exposed and requires climbing, so you need to be very careful to find the right path and not climb something that cannot be descended. I got stuck the first time. The passage is easier going up than down, so don't be afraid of heights.
The descent of the recapée requires good technique to climb down fairly steep rock faces, but the level of exposure is limited this time and nothing like the ascent.

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Bennout
Bennout
• Edited:

I did this magnificent hike on 18 August, a beautiful route far from the beaten track.
With GPS, it was easy to follow the path to marker 9. From the small cairn, I followed the white and green markings to reach the trail just before marker 2. (Towards the sign "Col du Fret 120 lacets") and thus avoid the difficult part.
Watch out for ticks in the undergrowth.

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RPodor
RPodor
• Edited:

Overall rating : 4.3 / 5

Date of your route : Aug 01, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A beautiful (and challenging) hike completed in two stages with an overnight stay under the stars at the Bovinant chalet. The views are breathtaking, as are the climbs! This is a fairly physically demanding hike, both on the way up and on the way down. Between points 4 and 5, just above the Bovinant shelter, there is a small, very steep section where rocks can easily come loose... Yesterday, we witnessed an impressive fall of very large rocks down to the Bovinant shelter, triggered by hikers... If there had been people below, it could have ended very badly. It is also important to warn that the descent between points 6 and 7 is for experienced hikers who are not prone to vertigo (which is true for the entire hike). Finally, the section between points 9 and 10 is simply difficult, with no interest other than twisting your ankles... So, if you have a little time (and even then, I'm not sure it takes that long...), head to point 2 to finish the descent. Your knees will thank you! That said, I stand by my initial comment: it's magnificent from start to finish!

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frondas
frondas
• Edited:

Overall rating : 5 / 5

Date of your route : Jul 23, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A superb walk. I never tire of doing it!

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Siana
Siana

Overall rating : 4.7 / 5

Date of your route : Sep 14, 2020
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

We did this beautiful circular in September, with ideal weather and magnificent views!
The forest sections are very poorly signposted, and without GPS it's easy to get lost...

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jibe2303
jibe2303

Overall rating : 5 / 5

Date of your route : Sep 10, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A beautiful, uncrowded route that showcases the wild side of adventure! (except, of course, from the Bovinant Pass to the Grand Som). The trails are rarely used, but you will need GPS and network coverage to navigate the route from the Col des Aures to the return point.

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Emela
Emela

Overall rating : 5 / 5

Date of your route : Aug 19, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A magnificent route to recommend

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