4.8
(3)
41
riders
3
rides
Gravel biking around Horcajo de la Sierra-Aoslos offers routes through the Sierra Norte de Madrid and the Medio Lozoya Valley. The terrain features a mix of rural landscapes, including fields, fruit trees, and pastures, alongside mountainous surroundings. Historical paths and tracks, such as those connecting Buitrago del Lozoya and Montejo de la Sierra, provide varied surfaces for off-road cycling. The Madarquillos River and other arroyos traverse the area, adding to the natural features.
Last updated: May 16, 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.
4
riders
50.4km
03:26
750m
750m
Hard gravel ride. Very 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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The Castle and Walls of Buitrago del Lozoya, one of the most important medieval sites in the Community of Madrid: The town has pre-Roman roots and was mentioned by Livy as a Celtiberian fortress (Litabrum). Muslim Fortification: Between the 8th and 11th centuries, the Muslims built the wall to protect the territory. Reconquest: Alfonso VI conquered it in 1085, and it passed into Christian hands. Current Castle: Built in the 15th century by the Mendoza family, during the reign of John II of Castile. Historical Uses: Noble residence, defensive stronghold, and setting for events such as the imprisonment of Juana la Beltraneja.
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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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Beautiful walled town located in the mountains north of Madrid.
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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 region offers a diverse mix of rural landscapes, including fields, fruit trees, and pastures, alongside surrounding mountains. You'll encounter varied gradients and surfaces suitable for off-road cycling, often following the Madarquillos River with its historic bridges. The area is within the Sierra Norte de Madrid and the Middle Lozoya Valley, providing a blend of challenging ascents and scenic views.
While many routes in the area are geared towards experienced gravel bikers, the region's network of paths includes options that can be adapted for a more relaxed pace. For instance, the circular routes between Horcajo de la Sierra and Aoslos, passing by Los Molinos and Bellidas, offer a moderate 8-kilometer ride with some elevation gain, which might be suitable for families with older children or those seeking a less strenuous experience. Always check the route details for specific difficulty and elevation.
The area is rich in natural beauty. You can expect picturesque views of the surrounding mountains and the Madarquillos River. Some routes might take you near natural pools, offering a refreshing stop. For specific highlights, consider routes that pass by Puerto de la Puebla or offer views towards Pico Tres Provincias. The Chorrera de los Litueros Waterfall is another beautiful natural attraction in the vicinity.
The Sierra Norte de Madrid region, including Horcajo de la Sierra-Aoslos, generally offers pleasant conditions for cycling during spring and autumn. These seasons provide milder temperatures and vibrant landscapes. Summer can be warm, especially at lower elevations, while winter might bring colder temperatures and potentially snow in higher mountain areas, making some routes more challenging or inaccessible. Always check local weather forecasts before heading out.
Yes, there are several circular routes that are well-suited for gravel biking. For example, the El Berrueco – El Villar Reservoir and Gorge loop from Prádena del Rincón is a challenging 70 km loop offering extensive views. Another option is the Great Wall Bridge – Choza del Majadal loop from La Hiruela, which is a 72.6 km trail through mountainous terrain. For a moderate option, consider the Views of the Lozoya River – El Atazar Reservoir loop from Puentes Viejas.
Gravel biking around Horcajo de la Sierra-Aoslos is primarily defined by routes suitable for experienced riders. Most of the featured trails, such as the El Villar Reservoir and Gorge – Puerto de la Puebla loop from Prádena del Rincón, are rated as 'difficult' due to significant elevation gains and varied terrain. There is at least one 'moderate' option, the Views of the Lozoya River – El Atazar Reservoir loop from Puentes Viejas, but overall, be prepared for challenging rides.
The gravel biking routes in Horcajo de la Sierra-Aoslos are highly rated by the komoot community, with an average score of 4.75 stars. Over 40 gravel bikers have explored the varied terrain, often praising the challenging nature of the routes, the extensive views, and the opportunity to experience the rural landscapes of the Sierra Norte de Madrid.
Yes, the region is rich in heritage. Both Horcajo de la Sierra and Aoslos feature well-preserved traditional stone houses, corrales, and pajares. You can visit the Gothic-style Church of San Pedro in Cathedra in Horcajo de la Sierra or the rural Church of San Isidro in Aoslos. Traditional 'potros de herrar' (shoeing stocks) are preserved in both villages, and Aoslos has a fully restored forge. The 'La Reguera' hydraulic infrastructure is also a unique point of interest.
While specific parking locations for each trail are not detailed, the villages of Horcajo de la Sierra and Aoslos, as well as nearby starting points like Prádena del Rincón or La Hiruela, are good places to look for public parking. As the area is popular for outdoor activities, you will likely find designated parking areas within or on the outskirts of these settlements, especially near trailheads or local amenities.
Yes, Horcajo de la Sierra-Aoslos and the surrounding villages offer various amenities for visitors. You'll find rural houses and campsites that cater to outdoor enthusiasts. Both Horcajo de la Sierra and Aoslos have local cafes and restaurants where you can refuel after your ride. It's advisable to check availability and opening hours, especially during off-peak seasons.
The Sierra Norte de Madrid region is generally accessible by public transport from Madrid, primarily via bus services to the main towns. While direct access to every trailhead might require some planning, you can typically reach Horcajo de la Sierra-Aoslos or nearby villages like Prádena del Rincón or La Hiruela by bus. From there, you might need to cycle a short distance to reach your desired starting point. It's recommended to check current bus schedules and routes for the most up-to-date information.
Generally, gravel biking on established trails and paths in the Sierra Norte de Madrid does not require specific permits. However, it's always important to respect local regulations, especially concerning protected natural areas or private land. Always stick to marked trails, avoid disturbing wildlife, and practice Leave No Trace principles. If you plan to enter specific natural parks or reserves, it's wise to check their official websites for any particular rules or restrictions.


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