Between Monts du Matin and Combe d'Oyans in Rochefort-Samson

A very pretty and long hike around the Combe d'Oyans with beautiful panoramic views of the cliffs of Musan, Pierre Chauve and L'Epenet. The ruins of Rochefort-Samson Castle offer a beautiful view of the valley. Information board at the summit.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 15.05 km
  • ◔
    Average duration: 6h 50 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 887 m
  • ↘
    Descent: - 886 m

  • ▲
    Highest point: 891 m
  • ▼
    Lowest point: 423 m

Photos

Description of the walk

(S/E) From the Ducs car park, follow the path leading to the climbing site in a north-easterly direction.

(1) From the climbing site, cross the small ford over the Combe d'Oyans stream and continue north-northeast. Keep going in this direction. Ignore the various paths branching off to either side of the main path.

The rest of the route is partially marked in yellow and white.

After a small pass, you will reach a junction with aPR® marked in yellow and white.

(2) Turn right at a right angle onto the narrower path heading east and join the path coming from Beauregard-Baret.

(3) At the Saint-Isérat signpost, turn right (southeast) towards the Col de Sonnaize.

(4) At the Col de Sonnaize (hunters' shelter), continue in the same direction to the Pas du Loup.

(5) Shortly after Pas du Loup, on the left, there is a small, very steep path leading to the Ussets cave and back.

(6) Grotte des Ussets: the site is quite pretty. Do not venture too far inside the cave without the proper equipment: it is a real tunnel and not just a hole. Turn back.

(5) Continue to the left (south) and you will immediately reach the Pas du Loup (a very pretty viewpoint a few metres to the right).

(7) The path descends for a few steps: be careful not to miss the junction and turn left (east) towards Montagne des Ussets and then Col de Tournier.

(8) Reach the pass and a three-way junction. Take the middle path, which climbs slightly, towards Source de Font Pourcel. Stay on this path, heading south-east, ignoring the paths that cross it until you reach a wide track.

(9) Follow this track to the right, descending towards Les Pignes. Pass close to the Source de Font Pourcel.

(10) Shortly before reaching a crossroads, take a path slightly uphill on the left and head south towards Verdu. Stay on level ground and pass above the poplar trees, continuing to a fork in the road (directional mast).

(11) Turn left towards Pas de Bouvaret. The path climbs quite steeply to reach the Sentier de Bouvaret.

(12) At the next fork (Courbières signpost, 880 m), descend to the right towards Grimeaud (2.1 km). Stay on the path, ignoring any paths that cross it, and descend to a small road a little further down.

(13) At the road, continue climbing to the left. Pass a farm and a golden retriever breeding facility. A wide track follows the road. A few metres further up, at a crossroads, turn left. Continue climbing. Pass a path on the left before reaching a small pass and directional masts. Follow the path to the left towards the north-west, Totet, Coquat North and South. Stay on the marked path, ignoring any paths that join or cross it.

(14) At the next crossroads (Coquat South signpost), continue straight ahead, heading north towards Coquat North and the castle ruins.

(15) Rochefort-Samson Castle mast: make a round trip to the castle ruins (information board).
Return to the mast and take the path on the left leading to the Rochefort-Samson road. Follow the road to the left.

(16) At the next junction, descend via a path to the road. Follow it straight ahead to the Ducs car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 442 m - Parking des Ducs, towards the climbing site
  2. 1 : km 0.46 - alt. 427 m - Climbing site
  3. 2 : km 2.07 - alt. 613 m - Crossroads, turn right at 90°
  4. 3 : km 2.3 - alt. 683 m - Crossroads, turn right at 90°
  5. 4 : km 3.25 - alt. 762 m - Col de Sonnaize (782m)
  6. 5 : km 3.72 - alt. 793 m - Cave fork
  7. 6 : km 3.78 - alt. 799 m - Site of the Grotte des Ussets, return trip
  8. 7 : km 3.86 - alt. 792 m - On the left, towards Col de Tournier - Pas du Loup (756m)
  9. 8 : km 4.86 - alt. 740 m - Col des Tourniers (742m)
  10. 9 : km 5.35 - alt. 841 m - Track, on the right
  11. 10 : km 6.63 - alt. 678 m - Path on the left
  12. 11 : km 7.53 - alt. 702 m - Direction Pas de Bouvaret
  13. 12 : km 9 - alt. 883 m - Courbières mast, towards Grimaud on the right
  14. 13 : km 10.46 - alt. 733 m - Grimeaud road
  15. 14 : km 13.38 - alt. 587 m - Coquat mast
  16. 15 : km 13.5 - alt. 582 m - Mast of the ruined site, return to the castle then turn left
  17. 16 : km 14.63 - alt. 498 m - Crossroads, path descending to the right after the - Col de Saint-Genis (529m)
  18. S/E : km 15.05 - alt. 442 m - Parking des Ducs car park

Notes

Do not venture inside the cave without proper equipment

Worth a visit

Magnificent climbing site at Combe d'Oyans
Site of the Grotte des Ussets
Pas du Loup viewpoint
Ruined castle of Rochefort-Samson

Always be cautious and plan ahead when you're outdoors. Visorando and the author of this route cannot be held responsible for any accidents occurring on this route.

The GR® and PR® markings are the intellectual property of the Fédération Française de Randonnée Pédestre.

Reviews and comments

4.4 / 5
Based on 16 reviews

Reliability of the description
4.3 / 5
Ease of following the route
4.3 / 5
Route interest
4.8 / 5
bader
bader
• Edited:

Overall rating : 4 / 5

Date of your route : Sep 29, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : Yes

Done in good weather, indeed at point 2; you have to turn at a right angle, but there is no path.
The hike is mostly under cover of trees, which is ideal in hot weather.
I completed it in five and a half hours, including breaks.

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MissVertigo
MissVertigo
• Edited:

Overall rating : 4.7 / 5

Date of your route : May 07, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Taken on 3 May 2025 in sunny weather.
A magnificent hike!!!! Beautiful landscapes, meadows and undergrowth full of flowers, varied paths. Enchanting!
We didn't go to point 2 either (couldn't see the path). No GPS, but a compass came in handy. We often had doubts, but in the end we didn't get lost.

Very important (for me, maybe useful for others...) no dizzying heights! Cool!
Thank you, Ardechom!!!!!

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LeBrun's
LeBrun's

Overall rating : 4.3 / 5

Date of your route : Jan 27, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A pleasant hike without any major difficulties.
To reach the first viewpoints, the climb is long and steep.
But with a little determination, you'll get there 😉

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foxy26
foxy26

Overall rating : 4.3 / 5

Date of your route : Jul 26, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

A beautiful hike offering stunning views of the Drôme valley between Romans and Valence. However, PLEASE NOTE: do not go as far as point 2, as the path on the right no longer exists at this point! Take the path on the right about 200 metres before "La Comdamine". At point 11, we took a wider path and at the top of this path we had to find the new, little-used trail. Much of the route is through forest, which provides protection from the heat and can even be quite cool. In any case, a GPS tracker is strongly recommended for this route.

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Pauline73670
Pauline73670

Overall rating : 3.7 / 5

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

In low season, a lovely discovery of the hills of the Drôme.
A pleasant hike and a lovely discovery.

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promenades
promenades

Overall rating : 4.3 / 5

Date of your route : Feb 05, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

A beautiful, very physically demanding hike. At point 2, the trail was not visible, so we continued along the track to point 3. The trail leading to the Ussets cave is located AFTER the Pas du Loup, a magnificent site worth seeing. Thanks to the author, we will definitely do it again.

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sempervivum
sempervivum

Overall rating : 4.7 / 5

Date of your route : Dec 25, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A challenging hike due to its length and the ascents/descents halfway through. Beautiful views, numerous possible variations. Small observatory next to the orientation table

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Runnerup
Runnerup

Overall rating : 5 / 5

Date of your route : Jun 21, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

We set off for the Combe d'Oyans campsite. The distance is 18 km.

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elisabeth dubost
elisabeth dubost

Overall rating : 4.3 / 5

Date of your route : Jun 03, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

Thank you very much for this hiking suggestion: lots of beautiful views. Quite challenging.
We modified it slightly: before point 2, we took the path on the right, which was a bit steep. It joins the marked path that leads to the Col de Sonnaize.
Between points 11 and 12, we stayed on the marked path.
We made a round trip to the Ussets cave.
The whole group was delighted with this beautiful route!

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elisabeth dubost
elisabeth dubost

Overall rating : 4.3 / 5

Date of your route : Jun 03, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

Thank you very much for this hiking suggestion: lots of beautiful views. Quite challenging.
We modified it slightly: before point 2, we took the path on the right, which was a bit steep. It joins the marked path that leads to the Col de Sonnaize.
Between points 11 and 12, we stayed on the marked path.
The whole group was delighted with this wonderful discovery.

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verorizo
verorizo

Overall rating : 4.7 / 5

Date of your route : Apr 20, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A magnificent solo walk. I know the area well, and on that day I had ideal conditions!
a fairly challenging walk with lots of beautiful views. Worth doing again and again!
the mummy remains the star attraction. Thanks to the author!

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Joëlle C1.
Joëlle C1.

Overall rating : 4.3 / 5

Date of your route : Mar 25, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

The Ussets cave is a few metres AFTER the Pas du Loup, otherwise it's a very physically demanding hike due to the series of ascents and descents
We had a great time
However, there were a lot of cars in the car park
We were able to park along the road 200 metres further on without obstructing traffic, but this bothered a local resident even though we were on a public road !

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GilVie
GilVie

Overall rating : 4 / 5

Date of your route : Feb 24, 2021
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

It's a really nice hike, but I got lost after point 10/11. I couldn't find the crossroads mentioned at the end of the description for point 10. And then I couldn't find the Bouvaret trail... I wouldn't mind some additional information. I don't deny that I may have made a mistake, but this isn't my first hike. Thank you in advance.
Otherwise, up to that point, it was perfect, quite challenging with a nice elevation gain.

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ardechom
ardechom

Thank you Fred and Sand for your comment. Indeed, if you are unsure about the location of the point (2), it is better to continue straight ahead until you reach the PR junction a little further on, then follow it to the right to reach the crossroads (3) a little further on. In the end, it is not much further.

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Fred et Sand
Fred et Sand

Overall rating : 4.3 / 5

Date of your route : Mar 03, 2020
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good

A very beautiful hike. The elevation gain is quite significant. We got lost between points 2 and 3. I think the easiest thing to do is to continue a little further than point 2 and take the purple trail that leads back to point 3. The weather was superb, which allowed us to enjoy the foothills of the Vercors. A physically demanding but wonderful hike. Highly recommended.

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