3.6
(10)
140
riders
30
rides
Mountain bike trails Alzen offer a diverse landscape for cycling, characterized by a mix of wooded hills, river valleys, and open terrain. The region features routes that traverse former railway lines, now converted into greenways, and include sections with tunnels and old bridges. Elevations vary, with some trails leading to mountain passes and others exploring areas around lakes and natural grottos. This varied topography provides a range of experiences for mountain bikers.
Last updated: October 7, 2026
3.7
(3)
14
riders
41.8km
02:45
570m
570m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.0
(1)
21
riders
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

3.5
(2)
11
riders
40.0km
04:46
1,490m
1,490m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.
5
riders
25.3km
02:06
500m
500m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
4
riders
20.4km
01:21
320m
320m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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The Lac de Mondély is a picturesque reservoir in the French department of Ariège, about 10 km from Mas-d'Azil. With its emerald green color and wooded shores, it is a popular destination for walks, picnics, and nature observation. A circular trail about 8 km long leads around the lake and is well-suited for a leisurely hike. Fishing is permitted (with a valid fishing license). However, swimming has been prohibited since 2023. There are parking spaces on site and a snack bar during the season.
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From the Cap du Carmil, enjoy an exceptional panorama of the Ariège Pyrenees and the surrounding valleys. A viewpoint that is well worth the climb. At the summit, your gaze extends far over the mountains and forests of Ariège. An unmissable spot for lovers of wide-open spaces.
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The Château de Foix impressively thrones on a rock above the town of the same name in the French Pyrenees. The medieval castle with its three distinctive towers was once the seat of the powerful Counts of Foix. Today, it houses a museum of regional history and offers a magnificent view of the old town and the surrounding mountain landscape.
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Saint-Girons is a charming small town at the foot of the Pyrenees in the Ariège department in the south of France. It is considered the gateway to the wild and original landscapes of Couserans. The town is particularly known for its lively weekly market, its cozy alleys, and its relaxed atmosphere. Hikers and nature lovers appreciate Saint-Girons as an ideal starting point for tours in the surrounding mountains. The mix of French flair, history, and nature makes the town a worthwhile destination.
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Saint-Girons is a charming small town at the foot of the Pyrenees in the Ariège department in southern France. It is considered the gateway to the wild and authentic landscapes of Couserans. The town is particularly known for its lively weekly market, its cozy alleys, and its relaxed atmosphere. Hikers and nature lovers appreciate Saint-Girons as an ideal starting point for tours in the surrounding mountains. The mix of French flair, history, and nature makes the town a worthwhile destination.
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quiet route, rolling towards Foix, steeper towards Saint Martin de Caralp
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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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There are 24 mountain bike trails around Alzen documented on komoot. These routes offer a variety of experiences, from easy rides to challenging ascents through diverse landscapes.
Alzen's mountain bike trails feature a diverse landscape of wooded hills, river valleys, and open terrain. Many routes utilize former railway lines converted into greenways, often including sections with tunnels and old bridges. You'll also find trails exploring areas around lakes and natural grottos.
Yes, Alzen offers 2 easy mountain bike trails, perfect for beginners or those looking for a relaxed ride. These routes typically feature smoother terrain and less elevation gain, making them ideal for a gentle introduction to mountain biking in the region.
For experienced riders, Alzen has 7 difficult mountain bike trails. These routes often involve significant elevation gain and more technical sections. An example is the Cap du Carmil – Col de Légrillou (938 m) loop from Serres-sur-Arget, which features over 1400 meters of ascent.
While specific 'family-friendly' designations aren't always available, the easy and moderate trails, especially those along greenways, are generally suitable for families. The Greenway departure parking lot loop from Serres-sur-Arget is a moderate route that includes a smooth greenway section, which can be a good option for families with some riding experience.
Many trails in Alzen pass by notable natural features. You can encounter mountain passes like Col de la Crouzette (1245 m) and Col de Légrillou (938 m). The region also features beautiful natural monuments such as Lac de Mondély and the Cap du Carmil summit. Some routes, like the Old metal bridge – The tunnels of Véloroute 81 loop from La Bastide-de-Sérou, even incorporate historical elements like old bridges and tunnels.
Yes, many of the mountain bike trails in Alzen are designed as loops, allowing you to start and end at the same point. Examples include the popular Greenway departure parking lot loop from Serres-sur-Arget and the challenging Cap du Carmil – Col de Légrillou (938 m) loop from Serres-sur-Arget.
The mountain bike trails in Alzen are highly rated by the komoot community, with an average score of 4.1 stars from over 15 reviews. Riders often praise the diverse landscape, the unique experience of riding through greenways with tunnels and old bridges, and the variety of routes available for different skill levels.
Alzen is not as widely known as some major mountain biking destinations, which can mean a more tranquil experience. While specific crowd levels vary, exploring some of the less popular routes or riding during off-peak times can help you find quieter trails. With 24 routes available, there's a good chance to discover a peaceful ride.
Yes, the region's topography includes areas around lakes and natural grottos. For instance, the Lac de Mondély – The widowed station lady loop from La Bastide-de-Sérou takes you past Lac de Mondély. Another route, the Grotte du Mas-d'Azil – The tunnels of Véloroute 81 loop from Castelnau-Durban, explores areas near the Grotte du Mas-d'Azil.
Given the varied terrain including wooded hills and open areas, spring and autumn generally offer the most pleasant conditions with mild temperatures and vibrant scenery. Summer can be good, but some open sections might be hot. Winter riding is possible, but conditions can be unpredictable, especially at higher elevations or on less maintained trails.


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