4.8
(3)
41
riders
3
rides
No traffic gravel bike trails around Horcajo de la Sierra-Aoslos are situated in the Sierra Norte de Madrid, within the middle Lozoya Valley, at an altitude exceeding 1,000 meters. This region features varied terrain, including rolling mountains, lush valleys, and dense forests, with predominant oak trees and riverside vegetation along the Hera, Los Haces, and Madarquillos rivers. The landscape offers a network of unpaved surfaces, forest tracks, and riverside paths suitable for gravel biking.
Last updated: May 21, 2026
5.0
(1)
17
riders
101km
08:54
2,070m
2,070m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
4.5
(2)
15
riders
70.0km
05:22
1,040m
1,040m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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2
riders
31.9km
02:19
420m
420m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
3
riders
105km
08:55
2,430m
2,430m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Popular around Horcajo de la Sierra-Aoslos
The landscape of the El Cardoso Pass is very typical of the Central Mountain System. Its pass separates the oak forest that thrives on one side and the pine trees that spread across the other. It also has extensive alpine meadows from which the rest of the mountain range can be seen.
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Place between Segovia and Guadalajara that is the starting point for many routes.
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Wonderful views and surroundings
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The Church of San Pedro is located on Calle del Altillo in the town of Sieteiglesias, belonging to the municipality of Lozoyuela-Navas-Sieteiglesias, province of Madrid.
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Beautiful views of the Lozoya reservoir
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The Navas of Buitrago
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The Senda de las Gariñas is a circular path 6.5 km long. The route crosses part of the forest mass known as the Gariñas forest and reaches the Puentes Viejas reservoir, where we find the riverside landscape. The forest is made up mostly of resin pine, although as we approach the banks of the reservoir we also find ash trees and Montpellier maples.
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There are several dedicated no traffic gravel bike trails in the Horcajo de la Sierra-Aoslos area. This guide features 3 routes, all of which are considered difficult, offering a challenging and rewarding experience away from vehicular traffic.
The terrain in Horcajo de la Sierra-Aoslos is quite varied, reflecting its location in the middle Lozoya Valley and the foothills of the Somosierra mountain range. You'll encounter rolling mountains, lush valleys, and dense forests, with paths often following traditional routes, forest tracks, and riverside paths. Expect a mix of unpaved surfaces, ideal for gravel biking.
Yes, the routes featured in this guide are all rated as 'difficult', providing a significant challenge for experienced gravel bikers. For example, the El Villar Reservoir and Gorge – Puerto de la Puebla loop from Prádena del Rincón covers over 100 km with more than 2000 meters of elevation gain.
The trails offer a wealth of natural beauty and historical points of interest. You can explore areas around the Madarquillos River, the Lozoya River, and the El Atazar and El Villar Reservoirs. Notable natural highlights include the Chorrera de los Litueros Waterfall and the Birch Forest of Somosierra. You might also pass through charming villages like La Hiruela and cross an ancient Roman bridge linking Horcajo de la Sierra and Aoslos.
Yes, many of the gravel bike routes in the region are designed as loops, allowing you to start and end in the same location. Examples include the El Berrueco – El Villar Reservoir and Gorge loop from Prádena del Rincón and the Views of the Lozoya River – El Atazar Reservoir loop from Puentes Viejas.
The region is enjoyable for gravel biking across multiple seasons. Spring and autumn offer pleasant temperatures and vibrant landscapes. During warmer months, the natural pools in the Sierra Norte provide refreshing spots. Winter can also be an option, especially on trails that remain accessible and clear of heavy snow.
While the routes highlighted in this guide are generally rated as 'difficult', the broader network of trails in the Sierra Norte de Madrid includes itineraries suitable for various levels. For families or beginners, it's advisable to look for shorter, flatter sections or consult local information for easier paths, as the featured routes involve significant distances and elevation changes.
Many routes in the Horcajo de la Sierra-Aoslos area start from villages like Prádena del Rincón or Puentes Viejas. These villages typically offer public parking options, often near the starting points of popular trails. Always check local signage for specific parking regulations.
The area is highly rated by the komoot community, with an average score of 4.75 stars. Reviewers often praise the stunning natural landscapes, the quiet and traffic-free nature of the trails, and the challenging yet rewarding climbs and descents. The blend of natural beauty and cultural heritage, including historical sites, also adds to the appeal.
Many trails in natural areas of Spain, including the Sierra Norte de Madrid, are generally dog-friendly, especially if dogs are kept on a leash. However, specific regulations can vary depending on the protected status of certain areas (e.g., natural parks, reserves). It's always best to check local rules or specific route descriptions for any restrictions before heading out with your dog.
Yes, the area offers several long-distance options. For example, the Puerto de la Quesera – Entrance to Hayedo de Montejo loop from Somosierra is over 100 km long, providing an extensive ride through varied landscapes and significant elevation changes.
The diverse ecosystems of the Sierra Norte de Madrid, with its oak forests, riverbanks, and mountain foothills, support a variety of wildlife. You might spot various bird species, deer, wild boar, and smaller mammals. Maintaining a respectful distance and observing from afar is always recommended.


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