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France
Occitania
Saint-Gaudens

Fos

The best MTB trails around Fos

3.9

(99)

737

riders

34

rides

Mountain bike trails around Fos are characterized by their mountainous terrain, featuring significant elevation changes and winding paths through valleys and passes. The region offers a diverse landscape for mountain biking, from challenging climbs to technical descents. Riders can expect to encounter varied surfaces, including forest tracks and rocky trails. This area provides a robust setting for mountain biking, with routes that traverse natural features and offer expansive views.

Best mountain bike trails around Fos

  • The most popular mountain bike…

Last updated: May 6, 2026

4.9

(12)

61

riders

#1.

Valle de Toran: Les - Pista Portet - Refugio Honeria - Canejan - Les — Circular por el Valle de Arán

39.4km

04:11

1,310m

1,310m

Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.

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Hard

Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.

Hard
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Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.

Hard

5.0

(5)

18

riders

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

Moderate

4.3

(7)

101

riders

Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.

Hard
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Popular around Fos

GR 10 – Explore the Ariège Pyrenees crossing the Pyrenees

On wild ridges: Catalonia to Ariège – Hexatrek, Eastern Pyrenees

Cycling around Fos

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GR 10 – Explore the Ariège Pyrenees crossing the Pyrenees

Hiking Collection by

Luc Gesell

Tips from the Community

Andrés Sisó
February 23, 2026, Puerto del Portillón

Beautiful port with a French side heavily covered by forest

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The Col du Portillón is a short but intense mountain pass that connects the Aran Valley to France via a narrow, shady road through forests. Its ascent, with its pleasant slopes, is highly appreciated by local and professional cyclists.

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Beautiful climb up Col de Menté. Although not a really famous climb it is a beautiful one, with nice hairpins inside the forest and beautiful views at the end.

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Also, stop at the Là Soulan hostel for a well-deserved break. Very warm welcome. 👍

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From Lez, the ascent of the Col de Menté is classified as first-class, with nine kilometers at an average gradient of 8.7%. Its fairly steady gradient allows you to find your own pace.

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A challenging climb from Luchon, but still worth it.

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Strenuous but worthwhile climb.

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Jordi Malet
August 22, 2024, Bossòst

Large village where we can find several bars and shops. From here we can go up to the gate or follow the valley of Aran, either up to find Vielha or towards Les. From Les we can take the Col de Menté, highly recommended, or go in search of the Col de Balés - incredible.

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Frequently Asked Questions

What kind of terrain can I expect on mountain bike trails around Fos?

The mountain bike trails around Fos are characterized by mountainous terrain, featuring significant elevation changes and winding paths through valleys and passes. You can expect a diverse landscape with challenging climbs and technical descents, encountering varied surfaces including forest tracks and rocky trails. The area offers a robust setting for mountain biking with routes that traverse natural features and provide expansive views.

How many mountain bike trails are available in Fos, and what are their difficulty levels?

There are 35 mountain bike trails around Fos. The majority are challenging, with 21 routes rated as difficult and 13 as moderate. There is also 1 easy trail available, offering options for various skill levels.

Are there any circular mountain bike routes in Fos?

Yes, many routes around Fos are circular. For example, the challenging Valle de Toran: Les - Pista Portet - Refugio Honeria - Canejan - Les — Circular por el Valle de Arán is a 39.4 km loop with over 1,300 meters of elevation gain. Another popular option is the difficult Menté Pass – Menté Pass loop from Saint-Béat-Lez, covering 34.4 km.

What are some notable natural features or landmarks I can see while mountain biking in Fos?

The region around Fos offers several natural attractions. You can encounter impressive mountain passes like Menté Pass and Caube Pass. There are also beautiful lakes such as Arres Pond and Étang d'Araing, and stunning waterfalls like Salto del Pish Waterfall.

Are there any moderate mountain bike trails suitable for intermediate riders?

Yes, there are 13 moderate mountain bike trails in Fos. A good example is the Bossòst – Portillón Pass loop from Les, which is 24.1 km long with 667 meters of elevation gain, offering a rewarding ride without the extreme difficulty of some other routes.

What do other mountain bikers say about the trails in Fos?

The mountain bike trails in Fos are highly regarded by the komoot community, with an average rating of 4.1 out of 5 stars from nearly 100 reviews. Over 700 mountain bikers have used komoot to explore the varied terrain, often praising the challenging climbs, technical descents, and expansive views through mountainous landscapes.

What is the best time of year to go mountain biking in Fos?

Given the mountainous terrain and significant elevation changes, the best time to mountain bike in Fos is typically during the warmer, drier months from late spring to early autumn. This period generally offers more stable weather conditions and clearer trails, avoiding snow and excessive mud that can occur in winter and early spring.

Are there any trails that offer particularly scenic viewpoints?

Many trails in Fos offer expansive views due to the mountainous landscape. The Bossòst – Arres Viewpoint loop from Les is specifically named for its scenic outlooks, leading through varied mountain landscapes that provide excellent vistas.

Are there any specific regulations or permits needed for mountain biking in Fos?

The guide data does not specify any particular permits or regulations for mountain biking in Fos. However, it's always advisable to check local signage at trailheads and respect private property or protected areas. Adhering to general trail etiquette, such as staying on marked paths and yielding to hikers, is recommended.

Can I find challenging routes with significant elevation gain in Fos?

Absolutely. Fos is known for its challenging routes with substantial elevation gain. For instance, the Valle de Toran: Les - Pista Portet - Refugio Honeria - Canejan - Les — Circular por el Valle de Arán features over 1,300 meters of ascent, and the Menté Pass – Menté Pass loop from Saint-Béat-Lez includes over 1,100 meters of climbing.

What types of surfaces will I encounter on the mountain bike trails?

The trails around Fos feature varied surfaces, including forest tracks and rocky trails. Riders should be prepared for a mix of natural terrain, which can range from smoother paths to more technical sections with loose rocks and roots, typical of mountainous environments.

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