4.7
(32)
464
riders
66
rides
Mountain biking around Arratzu offers a diverse landscape within the Urdaibai Biosphere Reserve, characterized by rolling hills, dense woodlands, and river valleys. The terrain includes both challenging ascents and flowing descents, with routes often traversing through natural parks and past historical sites. The region's geology provides a mix of surfaces, from forest tracks to more technical singletrack.
Last updated: July 2, 2026
5.0
(1)
14
riders
46.8km
04:32
1,590m
1,590m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.
2
riders
19.0km
01:34
460m
470m
This moderate 11.8-mile mountain biking route in the Urdaibai Biosphere Reserve offers lush forests and scenic hills from Ajangiz.

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4.8
(4)
26
riders
36.6km
03:02
890m
890m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(1)
22
riders
29.7km
02:42
800m
800m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.0
(3)
25
riders
26.1km
02:11
700m
700m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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This Roman necropolis is located very close to the highest point of the Sollube massif. Here they received the ashes of the cremated deceased from a nearby town, between the 1st and 3rd centuries AD. c.
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At 684 meters high, this is the highest peak of the massif that bears its name. It is located on the left bank of the estuary. During the Civil War, the so-called Battle of Sollube took place on its slopes for eight days.
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This bridge is an incredible find in the middle of the forest. It is covered with ivy and in summer it is so green that it is hardly visible. If you go down next to the river you can take some great photos with the water and the bridge. For many years this bridge has had to survive numerous floods. It's amazing that he's still here.
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This little section of the trail has it all. There is a stream crossing, there is a nice climb or descent depending on the direction, there are great views, there are wide parts and narrow sections. It is a very nice trail for mountain biking.
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This trail starts just outside of Berroia. It's a very nice trail, mostly straight, that takes you through a beautiful forest.
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Nice trail along the edge of a tree farm. It can get overgrown at times and when wet it can be difficult, but overall a good trail.
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This is a lovely trail that can be a bit difficult when wet but otherwise easy to follow.
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Bermeo is a beautiful seaside town and worth a visit, but if you can't go, the view from the trail is pretty good too.
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There are over 70 mountain bike trails available around Arratzu, offering a wide variety of options for different skill levels and preferences.
Yes, Arratzu offers several easy mountain bike trails perfect for beginners. You can find at least 3 routes specifically graded as easy, providing a gentle introduction to the region's beautiful landscapes.
For experienced riders seeking a challenge, Arratzu has over 20 difficult mountain bike trails. One such route is Centro BTT Urdaibai Ruta 8 – Reserva de la Biosfera de Urdaibai, which covers 29.1 miles (46.8 km) with significant elevation changes, exploring the varied terrain of the Urdaibai Biosphere Reserve.
Many of the mountain bike routes around Arratzu are circular, allowing you to start and finish at the same point. An example is the Sollube Summit – Summit of Sollube loop from Gernika, a 22.7 miles (36.5 km) trail that takes you through the scenic hills surrounding Gernika.
The trails often pass through diverse landscapes within the Urdaibai Biosphere Reserve. You can encounter natural monuments like the Oma Forest and enjoy stunning vistas such as the Views over the Urdaibai marsh. Some routes also lead past historical sites and charming villages.
The spring and autumn months generally offer the most pleasant conditions for mountain biking in Arratzu, with mild temperatures and lush scenery. While summer can be warm, the dense woodlands provide some shade. Winters are typically mild but can be wet, so checking the weather forecast is always advisable.
Yes, for those looking for longer rides, Arratzu offers several routes over 20 miles. Beyond the difficult Ruta 8, consider the Artzubi Bridge – Ajangiz Village and Church loop from Gernika, a moderate 29.7 km (18.5 miles) trail that provides a substantial ride through varied terrain.
The mountain bike trails in Arratzu are highly regarded by the komoot community, with an average rating of 4.7 stars from over 30 reviews. Riders often praise the region's diverse landscapes, from rolling hills and dense woodlands to river valleys, and appreciate the mix of challenging ascents and flowing descents.
While specific 'family-friendly' designations aren't always explicit, the easier and moderate routes are generally suitable for families with some biking experience. Look for routes with lower difficulty grades and shorter distances to ensure an enjoyable outing for everyone.
To find less crowded trails, consider exploring routes that are not highlighted as the most popular. While Urdaibai BTT Center Route 2 is a favorite, exploring other moderate trails like the Arrola Oppidum loop from Institutoa, especially during off-peak hours or weekdays, can lead to a more tranquil experience.
Absolutely. Beyond natural beauty, you can cycle to significant cultural sites. For instance, the Old Tree of Gernika (Gernikako Arbola) is a historic natural monument within reach of some routes. You can also find viewpoints like View from San Pedro de Atxarre offering panoramic vistas.


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