4.9
(8)
125
riders
4
rides
Gravel biking around Ason offers a selection of challenging routes through varied terrain. The region features significant elevation gains, with trails navigating through hilly landscapes and incorporating features like tunnels. These routes provide opportunities for car-free cycling, allowing riders to experience the area's natural environment.
Last updated: June 30, 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.
2
riders
27.2km
02:13
700m
700m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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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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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.
1
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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.
1
0
Short and easy quiet route
0
0
Beautiful town, mountain, river and nature
0
0
no kidding. 32 miles of this round trip of 40 miles was on gorgeous bike trails
0
0
There are 4 dedicated traffic-free gravel bike trails around Ason featured in this guide. These routes offer challenging rides away from vehicle traffic.
The traffic-free gravel bike trails in Ason vary in length and elevation. For instance, the A & C Tunnel Entrance – El Sobaco Tunnel loop from Castaño auzunea is over 56 km long with more than 900 meters of elevation gain, while the Alto de Guriezo – Menhir Yelso de Hayas loop from Marrón covers about 27 km with nearly 700 meters of ascent.
Yes, all the traffic-free gravel bike routes listed in this guide are rated as 'difficult'. They are designed for experienced riders looking for a challenging adventure with significant elevation changes and longer distances, such as the Picón Blanco – La Sía Pass loop from Espinosa de los Monteros which features over 1150 meters of climbing.
All the traffic-free gravel bike routes highlighted in this guide are circular, allowing you to start and end your ride at the same point. This includes tours like the Dramatic Cloudy Sky – Menhir Yelso de Hayas loop from Limpias.
Along the traffic-free gravel bike trails in Ason, you can encounter impressive natural features. Keep an eye out for highlights such as the stunning Asón Waterfall or the scenic La Sía Pass, offering memorable views.
Yes, several routes pass through or near significant viewpoints and mountain passes. You can experience the panoramic views from Alto de la Posadía or traverse mountain passes like Portillo Lunada and Puerto de Alisas.
The komoot community highly rates the experiences around Ason, with an average score of 4.9 stars. Riders often praise the challenging terrain and the opportunity to explore the region's natural beauty away from traffic.
While specific seasonal data for Ason isn't available, generally, spring and autumn offer the most pleasant conditions for gravel biking, with milder temperatures and varied landscapes. Summer can be warm, and winter might bring colder weather and potentially challenging conditions at higher elevations.
While the routes themselves are focused on gravel biking, the region around Ason features several prominent peaks. You might spot Pico Porracolina or Peña Pando Summit in the distance, adding to the scenic backdrop of your ride.
As these routes are designed to be traffic-free, you'll typically find parking options at the designated starting points of the loops, such as Castaño auzunea for the A & C Tunnel Entrance loop, or Marrón for the Alto de Guriezo loop. Always check local signage for parking regulations.

