Top 9 Mountain Passes around Ason
Best mountain passes around Ason are found in a region characterized by diverse landscapes, from dense forests to panoramic mountain views. The area, including the Collados del Asón Natural Park, offers routes that traverse challenging climbs and scenic descents. Its passes provide opportunities to explore varied terrain, often revealing vistas of distant peaks and valleys. This region is known for its natural beauty and varied terrain.
Best mountain passes around Ason
- The most popular mountain passes is La Sía Pass…
Last updated: May 9, 2026
La Sía Pass
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Alto de la Posadía
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Portillo Lunada
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Los Tornos via La Revilla and Fresnedo
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Puerto de Alisas
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Esquilo Pass
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Fuente Las Varas Pass
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Climb to the Portillo de Lunada pass from San Roque de Riomiera
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Spectacular scenery, little traffic, and a fairly easy gradient distribution.
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Puerto de los Tornos Viewpoint
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Ascent to Collado de la Espina / Los Machucos from Bustablado
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Other adventures around Ason
Tips from the Community
Climb with spectacular views
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Uphill road with beautiful views and a quick descent towards Treto
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That's not correct. From Los Tornos, you can't see Lanestosa. :( If you went up the N-620, you've passed through Lanestosa. But from the top of the pass, what you see is Soba. ;) If you went up through Fresnedo, you can't see it either.
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Spectacular panoramic views. Right in the valley ahead, Lanestosa, the westernmost town in Bizkaia bordering Cantabria.
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This is one of the most beautiful climbs in the region. It's 17.5 kilometers long, accumulating almost a thousand meters of elevation gain at an average of 5.7%. Spectacular scenery, little traffic, and a fairly easy gradient distribution.
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This climb is one of the most beautiful in the region. The surface is slightly uneven, the average gradient is 8.7%, and there are slopes exceeding 28%, so take it easy and enjoy the spectacular views the ascent affords.
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Nice path through lush meadows. Only animals, no people.
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Frequently Asked Questions
What kind of landscape can I expect when visiting the mountain passes around Ason?
The region around Ason is characterized by diverse landscapes, ranging from dense forests to panoramic mountain views. Many passes offer opportunities to explore varied terrain, often revealing vistas of distant peaks and valleys, particularly within the Collados del Asón Natural Park.
Which mountain passes are popular for cycling in the Ason area?
Cyclists often enjoy passes like La Sía Pass, which was paved for the Vuelta a España, and Puerto de Alisas. Puerto de Alisas is known for its well-maintained and signposted road that passes through pretty towns, offering mythical views in Cantabria.
Are there mountain passes around Ason that offer scenic viewpoints?
Yes, many passes provide excellent viewpoints. For instance, Los Tornos via La Revilla and Fresnedo offers panoramic views of snowy mountains in winter. Alto de la Posadía is another great spot for views, including the Poljé de Brenavinto, and serves as a good break point after a climb.
What are some challenging mountain passes for experienced trekkers or cyclists?
For those seeking a challenge, the Ascent to Collado de la Espina / Los Machucos from Bustablado is categorized as challenging. While many passes are intermediate, their climbs can be demanding, especially for cyclists.
What outdoor activities can I do near the mountain passes in Ason?
Beyond traversing the passes, the Ason region offers a variety of outdoor activities. You can find numerous options for hiking, running, and gravel biking. Popular routes include the Asón Valley Trail for running and the Senda de la Dama Roja Trail for hiking.
Are there any hidden gem mountain passes or less-trafficked routes in the Ason area?
While not explicitly 'hidden gems,' passes like Esquilo Pass and Fuente Las Varas Pass offer routes that might be less frequented than the most popular cycling climbs. The route for Los Tornos via La Revilla and Fresnedo is noted for being a road where it's difficult to find another vehicle, suggesting a quieter experience.
What do visitors say about the mountain passes around Ason?
Visitors appreciate the aesthetic beauty and challenging nature of the passes. For example, La Sía Pass is described as an 'Aesthetic port,' and Puerto de Alisas is praised for its 'mythical' views. Many enjoy the well-maintained roads and the opportunity to see diverse landscapes, including snowy mountains in winter.
Can I find information about the natural features or geology near the mountain passes?
Yes, for example, from Alto de la Posadía, you can clearly see the Poljé de Brenavinto, and informative signs are available to guide you to various routes. The region is part of the Collados del Asón Natural Park, indicating significant natural and geological interest.
Are there any specific tips for visiting La Sía Pass?
Visitors recommend wrapping up well when visiting La Sía Pass as it can be very windy. It's also known for its aesthetic appeal and can be linked to the Picón Blanco.
What is the best time to visit the mountain passes around Ason?
While specific seasonal recommendations are not detailed for all passes, the description for Los Tornos via La Revilla and Fresnedo mentions that the view is 'even more spectacular with all those snowy mountains' in winter, suggesting that different seasons offer unique experiences. Generally, spring and autumn might offer milder weather for activities, while winter provides snowy vistas.
Are there any mountain passes around Ason that are particularly good for views of the surrounding peaks?
Absolutely. Los Tornos via La Revilla and Fresnedo offers panoramic views stretching from Picón Blanco to the Sierra del Hornijo. From Esquilo Pass, you can glimpse the peaks of Asón, including Peña Rocias, Colina, and Porracolina, along with the Matienzo poljé.
What kind of roads can I expect on the mountain passes in the Ason region?
Many passes feature well-maintained roads. For example, the road for Puerto de Alisas is in good condition and well signposted. Similarly, the alternative route to climb Los Tornos via La Revilla and Fresnedo is described as having a road in perfect condition.
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