4.6
(15)
393
riders
33
rides
Mountain bike trails in Montes Obarenes-San Zadornil traverse a diverse landscape at the confluence of the Cantabrian Mountains and the Ebro Valley. The region is characterized by deep river gorges, such as those carved by the Ebro and Oca rivers, alongside extensive forests of holm oaks, pines, and beeches. This geological variety offers mountain bikers a range of terrain, from river valleys to elevated forest paths. The park's transitional climate supports a rich biodiversity, providing scenic backdrops for rides.
Last updated: May 20, 2026
5
riders
40.7km
03:26
500m
500m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
4
riders
45.5km
04:36
1,020m
1,020m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.

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4.3
(3)
85
riders
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.
5.0
(1)
54
riders
39.1km
04:09
1,100m
1,090m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.
4.3
(3)
30
riders
55.7km
04:30
290m
290m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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Popular around Montes Obarenes-San Zadornil
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Gravel biking in Montes Obarenes-San Zadornil
It's worth the joy to detour from the road to see the waterfall
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Built to span the Ebro River, this stone bridge is an impressive 143 meters long and features nine arches. The central section boasts a slender defensive tower, adorned with battlements and arrow slits, added in the 14th century. In medieval times, passage was controlled from this tower: anyone wishing to cross the bridge had to pay a toll of a few maravedís. The bridge offers one of the best views of the city of Frías.
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The Castle of the Dukes of Frías was declared a Site of Cultural Interest on April 22, 1949. It is situated on a rocky promontory overlooking the town and almost the entire Tobalina Valley. The oldest surviving remains date from the late 12th and early 13th centuries, but most of what remains is from the 15th century. Visitors can explore the large parade ground, part of the curtain wall, and the rampart walk, and climb the keep. Opening hours are daily from 10:30 a.m. to 2:00 p.m. and from 4:00 p.m. to 7:30 p.m., and the entrance fee is €2.
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Views of the Tobera waterfall
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Several waterfalls and areas to see in Tobera
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Beautiful medieval bridge over the Ebro River with views of Frias Castle
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One of the most beautiful bridges I know.
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Montes Obarenes-San Zadornil offers a diverse range of mountain bike trails, from relatively flat paths suitable for gravel biking along old railway lines to challenging routes with significant elevation gains through mountainous terrain. You'll find paths winding through deep river gorges, extensive forests of holm oaks, pines, and beeches, and open pastures.
Yes, the park caters to various skill levels. While many routes offer challenging climbs, there are also easier paths. For instance, sections of the Santander-Mediterranean Natural Trail provide accessible gravel adventures. The park's visitor centers in Oña and San Zadornil can offer guidance on routes suitable for different fitness levels, including those ideal for families or electric bikes.
Yes, there are several excellent circular mountain bike routes. A popular moderate option is the Valle de Tobalina - circular from Frías - Las Merindades, which explores varied landscapes near the historic village of Frías. For a more challenging experience, consider the Sierra de Oña — circular por Cillaperalta desde Oña, featuring significant elevation gains and expansive views.
Yes, the region is known for its dramatic natural landscapes. The Tobera Waterfalls Viewpoint – Frías loop from Frías is a challenging route that will take you past the scenic Tobera Waterfalls. The park itself is characterized by beautiful and deep gorges carved by rivers like the Ebro, Oca, and Purón, offering impressive rock faces and stunning views along many trails.
The area blends natural beauty with rich history. You can explore routes that pass through picturesque villages like Frías, known as Spain's smallest town, with its castle and hanging houses. The Oña Historic Town Center – MonasterioDeSanSalvador loop from Oña takes you through historical areas and past the medieval Monastery of San Salvador. Another route, the Oña Historic Town Center – Alcázar of the Constables loop from Oña, also explores the historic center of Oña.
The transitional climate between Atlantic and Mediterranean influences means the park offers diverse conditions. Spring and autumn are generally ideal, with pleasant temperatures and vibrant foliage. During these seasons, you can enjoy the extensive forests of holm oaks, pines, and beeches at their best. Summers can be warm, while winters might bring colder temperatures, especially at higher elevations.
There are over 30 mountain bike trails available in Montes Obarenes-San Zadornil. These routes are categorized by difficulty, with 2 easy, 22 moderate, and 10 difficult options, ensuring there's something for every skill level.
The mountain bike routes in Montes Obarenes-San Zadornil are highly rated by the komoot community, with an average score of 4.7 stars from over 14 reviews. Riders often praise the diverse terrain, the stunning natural landscapes, and the well-maintained network of trails that cater to different abilities.
While many trails offer expansive views from elevated forest paths and gorges, some routes may lead close to or offer views of prominent peaks. Notable summits in the area include Humion, El Cueto, and the Summit of Pan Perdido. While not all summits are directly bikeable, many trails provide panoramic vistas of the dramatic landscape.
The Montes Obarenes-San Zadornil Natural Park has visitor centers in Oña and San Zadornil, which serve as good starting points. While specific public transport links directly to all trailheads might be limited, these towns can often be accessed by regional bus services. It's advisable to check local transport schedules for the most up-to-date information when planning your trip.
Yes, the region has charming villages like Frías and Oña, which offer amenities for visitors. You can find cafes, pubs, and accommodation options in these towns, providing convenient bases for your mountain biking adventures. These villages also offer a chance to experience the local culture and cuisine.


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