4.9
(8)
125
riders
7
rides
Gravel bike trails around Ason are characterized by challenging terrain with significant elevation gains, suitable for experienced riders. The region features routes that traverse varied landscapes, including areas with tunnels, natural rock formations, and mountain passes. These trails often connect different towns, offering extended rides through diverse environments.
Last updated: June 28, 2026
5.0
(3)
31
riders
56.2km
03:27
910m
910m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
6
riders
77.2km
05:51
1,510m
1,510m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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5
riders
39.3km
03:06
950m
950m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
4.8
(5)
79
riders
77.6km
04:35
1,010m
1,010m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
2
riders
27.2km
02:13
700m
700m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
1
riders
40.1km
03:34
1,150m
1,150m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
1
riders
29.7km
02:25
770m
770m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Pass road in perfect condition. 7km constant climb from 40 to 340m pass height. The descent is also a dream.
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Bridge on the cycle superhighway over the motorway junction, for cyclists and pedestrians
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Already pretty much at the end/beginning of the railway line, here it is even asphalted, before/later not anymore, but always easy to ride.
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The Torre de los Baranda, in Espinosa de los Monteros, is a stately building that reflects the historical importance of the area's lineages.
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Short and easy quiet route
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Ideal for taking a dip on hot days!
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The Hermitage of San Bernabé is located at the main entrance to the Ojo Guareña Karst Complex and is part of the caves. It is located in the municipality of Cueva de Sotoscueva. The date of its construction is unknown; some place it between the 8th and 9th centuries, but it is also believed to date back to the 13th century. It was originally dedicated to San Tirso.
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The gravel biking routes in Ason are generally considered challenging, featuring significant elevation gains and varied terrain. All 5 of the listed routes are rated as 'difficult'. Riders should have prior experience with gravel biking and be prepared for demanding climbs and long distances. For example, the A & C Tunnel Entrance – El Sobaco Tunnel loop from Castaño auzunea involves over 2,979 feet (908 meters) of ascent.
Gravel bike trails in Ason are characterized by diverse and challenging terrain. You can expect routes that traverse varied landscapes, including areas with tunnels, natural rock formations, and mountain passes. The trails often connect different towns, offering extended rides through environments that demand good bike handling skills and endurance.
Yes, Ason offers several natural landmarks and viewpoints that can be explored. Notable attractions include the stunning Asón Waterfall, the impressive Cullalvera Cave, and scenic spots like Alto de la Posadía and Covalruyo Viewpoint. Some routes, like the Natural Rock Arch of Puentedey – Puentedey loop from Espinosa de los Monteros, specifically lead through areas with unique natural rock arches.
The gravel bike routes in Ason are designed for longer, more adventurous rides. Distances typically range from approximately 27 miles (44 km) to nearly 49 miles (79 km). For example, the Alto de Guriezo – Menhir Yelso de Hayas loop from Marrón is about 27 miles (44 km) and takes around 2 hours 37 minutes, while the A & C Tunnel Entrance – El Sobaco Tunnel loop from Balmaseda covers 48.9 miles (78.7 km) and can take about 4 hours 37 minutes.
Yes, many of the gravel bike routes in Ason are designed as loops, offering a convenient way to start and end your ride at the same point. Examples include the A & C Tunnel Entrance – El Sobaco Tunnel loop from Castaño auzunea, the Natural Rock Arch of Puentedey – Puentedey loop from Espinosa de los Monteros, and the La Sía Pass – Picón Blanco loop from Espinosa de los Monteros.
The gravel biking experience in Ason is highly rated by the komoot community, with an average score of 4.9 stars from 8 reviews. Riders often praise the challenging climbs, the varied terrain including tunnels and natural rock formations, and the opportunity to explore routes that connect different towns. The adventurous and demanding nature of the trails is a significant draw for experienced riders.
Given the challenging nature of the gravel bike trails in Ason, which feature significant elevation gains and are rated as 'difficult', they are generally not recommended for young families or casual rides with dogs. These routes are better suited for experienced riders seeking a demanding adventure. Always consider the specific needs and abilities of your family members or pets before attempting any trail.
While specific seasonal recommendations for Ason are not detailed, regions with challenging terrain and mountain passes often offer the best gravel biking conditions during spring, summer, and early autumn. These seasons typically provide more stable weather, longer daylight hours, and clearer trails. Winter conditions, especially at higher elevations or in areas with tunnels, could introduce snow, ice, or colder temperatures, making routes more difficult or impassable.
The routes in Ason often connect different towns, which typically means you can find local amenities such as cafes, restaurants, and accommodation options in these settlements. While specific establishments are not listed, planning your route to pass through or end in towns like Castaño auzunea, Balmaseda, Espinosa de los Monteros, or Marrón would likely provide opportunities for refreshments and lodging.
There are 5 distinct gravel bike trails listed for the Ason region. These routes are all categorized as difficult, offering challenging experiences for seasoned gravel bikers.
The gravel routes in Ason are known for significant elevation gains, making them quite challenging. For instance, the Natural Rock Arch of Puentedey – Puentedey loop from Espinosa de los Monteros features over 1,511 meters (4,957 feet) of ascent, and the A & C Tunnel Entrance – El Sobaco Tunnel loop from Balmaseda includes more than 1,015 meters (3,332 feet) of climbing.
The gravel routes in Ason typically start from towns or specific points within the region. For example, routes like the A & C Tunnel Entrance – El Sobaco Tunnel loop can be accessed from Castaño auzunea or Balmaseda, while others start from Espinosa de los Monteros or Marrón. These towns usually offer public parking facilities, but it's advisable to check local regulations or specific trailhead information for each route before your ride.


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