4.3
(103)
1,503
riders
83
rides
Mountain biking around Altzo offers access to a diverse natural environment within Spain's Basque Country. The area is characterized by its rural landscape, featuring extensive woods and lush meadows, set against a backdrop of mountainous terrain. Altzo is situated at the foot of Otsabio Mountain, providing opportunities for challenging climbs and descents. This region, part of the wider Gipuzkoa province, is known for its cycling infrastructure, making it a suitable base for exploring various mountain bike routes.
Last updated: July 2, 2026
5.0
(1)
20
riders
11.9km
01:01
240m
240m
Easy 7.4-mile mountain bike route, Centro BTT Tolosaldea Ruta 2, offers rural charm and views near Tolosa, perfect for beginners.
3.7
(3)
47
riders
30.7km
03:27
1,210m
1,210m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.

Sign up for free
2.0
(3)
36
riders
Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
3.0
(1)
22
riders
67.4km
06:01
1,450m
1,450m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
4.5
(2)
19
riders
33.3km
03:27
980m
980m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
Get access to more routes and recommendations from other explorers.
Sign up for free
Already have an account?
Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.
Start today with a free account
Your next adventure awaits.
Login or Signup
Scene of a famous battle, in the middle of a large field and surrounded by a herd of horses.
4
0
That bridge is called "INTUIA-ko zubia" the INTUIA farmhouse is next to it. The misnamed "witches' bridge" is called UNANIBI-ko zubia, right in the Otita park (beginning of the Leitzaran valley). Don't forget to bring lights to cross the numerous tunnels in this valley!! Not to see but to be seen.
1
0
Right where the antennas are, and very close to the San Lorenzo hermitage.
3
0
Tolosa is a jewel of the Basque Country that stands out for its historical, cultural and gastronomic heritage. Its old town, the Plaza Nueva, the medieval bridge and the Parque de Aranzazu are some of its main attractions. Tolosa is also an excellent starting point to explore the surrounding nature, with beautiful mountains and trails.
2
0
This is a special and magical forest. It is thick and green and feels very different from the surrounding peaks. It can be a bit messy when wet and even a bit difficult, but that's part of the fun.
0
0
This trail just below the Belabieta peak is very pretty. It has open fields and beautiful views. So if you don't make it to the top, you still have a good experience.
1
0
If you are going on a walk or bike ride to Euletxaga from Tolosa, this is a good place to take a look and see what awaits you.
0
0
Tolosa is a beautiful town/city on the Oria river. It has beautiful little streets and some very interesting and impressive architecture. It is surrounded by spectacular green mountains and many nice trails for biking, running or walking.
3
0
Mountain biking around Altzo is characterized by its diverse rural landscape. You can expect a mix of extensive woods, lush meadows, and mountainous ascents, especially as the town is situated at the foot of Otsabio Mountain. Trails often feature forest paths and open tracks, providing varied surfaces for riding.
The trails around Altzo cater to a range of abilities. While there are 6 easy routes, the majority are more challenging, with 21 moderate and 58 difficult routes available. This means you can find options for both beginners and experienced riders seeking more demanding climbs and descents.
Yes, Altzo offers some family-friendly options. For example, the Centro BTT Tolosaldea Ruta 2 – circular desde Tolosa is an easy, circular route that is part of a recognized mountain bike center, making it suitable for families looking for a less strenuous ride.
Given Altzo's mountainous setting at the foot of Otsabio Mountain, you can expect significant elevation gains on many routes. For instance, the challenging View of Belabieta Hillside – Artxipilaga Forest Trail loop from Tolosa involves over 1,100 meters of ascent, while the Mareagako Gana Summit (592 m) – Aldaba Summit (740 m) loop from Tolosa-Centro has nearly 700 meters of climbing.
The Basque Country generally offers a healthy atmosphere for outdoor activities. While specific seasonal advice for Altzo isn't detailed, the region's diverse landscapes suggest that spring and autumn would likely provide the most pleasant weather for mountain biking, avoiding the peak heat of summer and potential winter conditions in higher elevations.
Yes, the area around Altzo features several points of interest. You might encounter natural landmarks like Uzturre Summit (733 m) or Txindoki (1,346 m). Additionally, cultural highlights such as the Witches' Bridge and sections of the Plazaola Greenway can be found nearby.
The mountain biking experience around Altzo is highly rated by the komoot community, with an average score of 4.4 stars from over 90 reviews. Riders often praise the varied terrain, from quiet woodlands to challenging mountainous ascents, and the opportunities to explore the rugged beauty of the Basque Country.
Yes, several circular routes are popular among mountain bikers. The Centro BTT Tolosaldea Ruta 2 – circular desde Tolosa is an easy circular option. For more challenging loops, consider the View of Belabieta Hillside – Artxipilaga Forest Trail loop from Tolosa or the Mareagako Gana Summit (592 m) – Aldaba Summit (740 m) loop from Tolosa-Centro.
The lengths of mountain bike trails around Altzo vary significantly. You can find shorter routes like the Centro BTT Tolosaldea Ruta 2 at about 11.8 km (7.4 miles), up to much longer and more demanding trails such as the Leizarán Stone Bridge – Witches' Bridge loop from Tolosa-Centro, which spans over 67 km (41.9 miles).
While Altzo itself is a rural town, many routes in the area, including those mentioned, start from nearby Tolosa. Tolosa is a regional hub, and it's reasonable to assume that public transport options are available to reach starting points from there, such as the Mareagako Gana Summit (592 m) – Tolosa Train Station loop from Tolosa, which specifically mentions a train station.
Altzo is a picturesque rural town, and while specific cafes or pubs directly on the trails are not detailed, its proximity to larger towns like Tolosa suggests that amenities for food and drink would be readily available there. Many routes start or pass through Tolosa, offering opportunities for refreshment before or after your ride.
There are over 85 mountain bike trails available around Altzo, offering a wide variety of options for different skill levels and preferences. This includes 6 easy, 21 moderate, and 58 difficult routes.


Browse the best MTB trails in other regions.