4.6
(48)
1,068
riders
42
rides
Road cycling routes around Alzen traverse a landscape characterized by rolling hills and significant elevation changes, indicative of its position within a pre-Pyrenean environment. The region features numerous passes and valleys, offering varied terrain for road cyclists. Routes often include challenging ascents to cols and descents through rural areas.
Last updated: July 5, 2026
4.8
(9)
68
riders
44.2km
02:36
1,090m
1,090m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.
5.0
(2)
26
riders
40.5km
02:20
890m
890m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.

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16
riders
40.1km
01:56
570m
570m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
4.0
(2)
28
riders
52.4km
03:08
1,240m
1,240m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.
13
riders
41.5km
01:52
350m
350m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.
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I climbed it from its easier side, the one that starts from Foix and stretches for 28 kms, crossing the Col de Marrous. It's a steady climb, with a few tough kilometers, and very pleasant. It's the side used by the Tour de France to descend it. The best thing about the Mur de Peguère are the views from its summit.
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I can only speak about my experience descending it from the south side, the one that starts in the village of Biert. It's simply a great pass, with a very tough final section, very similar to its close brother Mur de Peguère. With hardly any traffic, it has the appeal that the road is very narrow and very winding, which helps mentally.
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Very surprising, quite and beautiful area, didn't see cars in july for maaaany km, just cyclists.
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Be careful, since yesterday, June 19th, the descent to Rivèrenert has been freshly graveled and dangerous. I had a rear puncture due to small, sharp gravel sticking to the tire when braking. So, don't go crazy on this descent, friends.
2
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Because around 12pm and >31°C, the climb from Biert is mostly in the shade, and this pass generally ends a series of small linked passes (like Portech, Catchaudégué or La Core, Saraillé, etc.). And the challenge of the last 3 km is worth experiencing to strengthen your mental strength. Get to your pedals
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Alzen offers a diverse network of over 40 road cycling routes. These routes cater to various skill levels, with options ranging from moderate loops to more challenging climbs through the pre-Pyrenean landscape.
While Alzen's terrain is generally characterized by rolling hills and elevation changes, there is at least one easy road cycling route available. Most routes are classified as moderate, offering a good balance for those with some cycling experience. For a moderate option that is not overly long, consider the Marrous Pass loop from La Bastide-de-Sérou.
For experienced road cyclists seeking a challenge, Alzen offers several difficult routes. One notable option is the Col de Péguère – Col de la Crouzette (1245 m) loop from La Bastide-de-Sérou, which features significant elevation gains, including ascents to mountain passes like Col de Péguère and Col de la Crouzette.
Road cycling routes around Alzen traverse a landscape of rolling hills and significant elevation changes, typical of a pre-Pyrenean environment. You'll encounter numerous passes and valleys, offering varied terrain with challenging ascents to cols and descents through rural areas. Some paths also lead near natural formations like caves.
Yes, all the featured road cycling routes around Alzen are designed as loops, allowing you to start and finish at the same point. This makes planning your ride convenient, as you won't need to arrange for return transport. Examples include the Grotte du Mas-d'Azil – L'Épicerie d'Ici loop from La Bastide-de-Sérou and the Foix – Foix Castle loop from La Bastide-de-Sérou.
The region around Alzen is rich in natural beauty and historical sites. Many routes offer scenic views from mountain passes. You can also explore notable landmarks such as the Col de la Crouzette (1245 m), Péguère Pass, and Col de Port. Some routes also pass by the impressive Grotte du Mas-d'Azil.
The road cycling routes in Alzen are highly regarded by the komoot community, holding an average rating of 4.1 stars from over 40 reviews. More than 1,000 road cyclists have used komoot to explore the varied terrain, often praising the challenging ascents and scenic descents through the valleys.
Many of the road cycling routes in the Alzen area, including some of the most popular ones, typically start from La Bastide-de-Sérou. This central location provides convenient access to various loops that explore the surrounding passes and valleys.
Yes, several routes incorporate local attractions. For instance, the Grotte du Mas-d'Azil – L'Épicerie d'Ici loop from La Bastide-de-Sérou and the Grotte du Mas-d'Azil – Portel Pass loop from La Bastide-de-Sérou both pass by the famous Grotte du Mas-d'Azil. Additionally, the Foix – Foix Castle loop from La Bastide-de-Sérou takes you past the historic Foix Castle.
Given Alzen's pre-Pyrenean setting, road cycling routes often feature significant elevation gains. For example, a moderate route like the Marrous Pass loop from La Bastide-de-Sérou involves an ascent of over 880 meters, while more difficult routes can exceed 1200 meters of climbing.
Yes, the routes around Alzen vary in length to suit different preferences. You can find routes ranging from approximately 40 kilometers, such as the Marrous Pass loop, to over 60 kilometers, like the Grotte du Mas-d'Azil – Portel Pass loop, allowing you to choose a distance that matches your endurance.


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