4.8
(22)
394
riders
30
rides
Touring cycling in Montes Obarenes-San Zadornil offers routes through a diverse landscape where mountain systems, river gorges, and plains converge. The region features dramatic topography with notable peaks and deep ravines carved by rivers like the Ebro and Oca. Cyclists can traverse through varied forests, including beech, holm oak, and pine, reflecting its unique position between Atlantic and Mediterranean biogeographical regions. This natural park provides an extensive network of tracks and paths suitable for touring cyclists, often following old railway…
Last updated: July 2, 2026
4
riders
33.1km
02:20
630m
630m
Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
1
riders
34.4km
02:43
660m
660m
Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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4.6
(8)
36
riders
24.5km
02:17
370m
370m
Hard bike ride. Good fitness required. You may need to push your bike for some segments of this route.
22
riders
40.7km
04:17
1,080m
1,070m
Hard bike ride. Very good fitness required. You may need to push your bike for some segments of this route.
5.0
(2)
16
riders
Moderate bike ride. Good fitness required. Mostly paved surfaces. 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
If you are in Tobera and Frías, you cannot miss visiting the hermitage of Santa María de la Hoz and the medieval bridge over the Molinar river. The temple is from the 13th century, features both Romanesque and Gothic elements, and has a portico with arches that offers good views of the surroundings. At its feet stands a second, tiny hermitage, from a later date – the 17th century – which houses an altar dedicated to Cristo de los Remedios.
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The city of Frías, declared a Site of Cultural Interest in 2005, a medieval town in Las Merindades Burgalesas. In this town we can see the hanging houses, the Castle of Frías, the church of San Vicente Mártir, the Wall, the medieval bridge, convent of San Francisco, the church of San Vítores, the washhouse and the convent of Vadillo.
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next to the road
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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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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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There are over 25 touring cycling routes in Montes Obarenes-San Zadornil, offering a diverse range of experiences through its unique landscapes of mountains, river gorges, and plains. These routes cater to various skill levels, from moderate paths to more challenging rides.
The region is renowned for its dramatic topography, featuring deep gorges carved by rivers like the Ebro, Oca, and Purón. You'll cycle through diverse forests, including beech, holm oak, and pine, and may encounter scenic waterfalls, particularly along the Molinar river. The landscape bridges Atlantic and Mediterranean biogeographical regions, offering a rich variety of flora.
Yes, the park offers routes suitable for families, with some paths featuring gentle inclines and well-maintained surfaces. While specific 'easy' routes are not highlighted in the top selections, the extensive trail network includes options that are less demanding, allowing families to enjoy the scenic beauty at a comfortable pace. Look for routes described as 'moderate' for a good balance.
Montes Obarenes-San Zadornil is rich in cultural and historical sites. You can visit picturesque villages like Frías, known for its castle and unique hanging houses, or Oña with its medieval monastery. Other notable towns include Poza de la Sal, a Historical-Artistic Site. Along your rides, you might encounter medieval bridges, abandoned churches, and ancient ruins. Don't miss the impressive Church of St. James or the historic Oña Historic Center.
Yes, many routes in Montes Obarenes-San Zadornil are designed as circular loops, allowing you to start and end your ride in the same location. Examples include the Natural Park of Montes Obarenes - San Zadornil — circular from Frías and the Hoz de Valdivielso — circular from Oña, which offer immersive experiences of the region's diverse landscapes.
The diverse forests and varied terrain make Montes Obarenes-San Zadornil enjoyable across multiple seasons. Spring and autumn generally offer pleasant temperatures and vibrant scenery, with spring bringing lush greenery and autumn showcasing rich fall colors. Summer can be warm, but routes through shaded forests or along river gorges provide cooler options. Winter cycling is possible, but some higher or unpaved sections might be more challenging due to weather conditions.
While the region is very nature-oriented, specific regulations for dogs on cycling trails within Montes Obarenes-San Zadornil Natural Park can vary. It's generally advisable to keep dogs on a leash, especially in protected areas or near wildlife. Always ensure your dog is well-behaved and that you clean up after them. Check local signage or park authority guidelines for any specific restrictions on certain paths.
Yes, the region features charming villages such as Frías, Oña, and Trespaderne, where you can find cafes, restaurants, and pubs to refuel. Additionally, old railway stations along the Santander-Mediterranean Natural Trail have been repurposed with benches and recreation areas, providing convenient stopping points for cyclists to rest and enjoy the surroundings.
The area is highly rated by the komoot community, with an average score of 4.7 stars from over 20 reviews. Reviewers often praise the region's diverse landscapes, the well-maintained paths (especially along old railway lines), and the opportunity to combine natural beauty with visits to picturesque villages and historical sites. The variety of routes catering to different fitness levels is also frequently highlighted.
Absolutely. Montes Obarenes-San Zadornil offers a range of routes from moderate to difficult. For example, the Trespaderne – Oña Historic Town Center loop from Trespaderne is a moderate option, while routes like the Oña Historic Town Center – Trespaderne loop from Frías or the Frías Medieval Bridge – Hanging Houses of Frías loop from Frías present more challenging terrain with significant elevation changes, suitable for cyclists with very good fitness.
While the region is rural, some of the larger towns like Oña or Trespaderne may have limited bus connections. However, direct public transport access specifically designed for cyclists to trailheads might be scarce. It's often more practical to arrive by car, especially if you're bringing your own touring bicycle. Check local bus schedules for connections to the main villages within or near the natural park.
Parking is generally available in the picturesque villages that serve as common starting points for routes, such as Frías, Oña, and Trespaderne. Many of these towns have designated parking areas for visitors. Additionally, some repurposed old railway stations along trails like the Santander-Mediterranean Natural Trail may offer parking facilities, providing convenient access to the cycling paths.


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