4.7
(150)
2,333
riders
56
rides
Mountain biking in Demervallei Tussen Aarschot En Diest offers diverse terrain, transitioning from the flat Kempen region to the undulating Hageland. The area features a broad river valley with the winding Demer river, complemented by distinctive sand-lime hills to the south and land dunes to the north. This varied topography provides a mix of sandy stretches, challenging climbs, and extensive natural reserves with forests and marsh areas, ideal for mountain bike trails.
Last updated: August 31, 2026
4.4
(36)
417
riders
38.9km
02:40
170m
170m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
4.8
(20)
260
riders
45.8km
03:12
190m
190m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.

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4.7
(18)
231
riders
45.1km
02:58
180m
180m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.1
(29)
315
riders
42.9km
02:40
200m
200m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
4.0
(1)
76
riders
61.4km
03:49
150m
150m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
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Popular around Demervallei Tussen Aarschot En Diest
Streek-GR Hageland β Hollow roads and endless fields
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Gravel biking in Demervallei Tussen Aarschot En Diest
Fort Leopold was an important part of the defense belt around Diest in the nineteenth century. It is located on the Lazarijberg and offers a beautiful view of the city as well as the citadel located a little further away. The intention was for the fort to protect the city, but a few years after it was put into use, it was already converted into a prison. Punished soldiers from the Leuven prison were brought to the fort. Writings on the wall are still silent witnesses of that time. Prisoners were also locked up during the World Wars. The fort was used by the paratroopers in the second half of the twentieth century, but they left about 20 years ago. Since then, only a caretaker has maintained the building. In 1996, it became a protected monument. The building is constructed from hundreds of thousands of bricks and has very thick walls, making it very cold and dark, the ideal habitat for bats, according to the Agency for Nature and Forest, which is the current owner.
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Walk through the forest between Blauberg and Ramsel.
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This road actually runs right through the nature reserve. On one side lies the Webbekoms Broek, adjacent to the city of Diest; on the other side run the Demer and the Zwarte Beek, and lie the Diesters Broek and the Rotbroek.
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Slalom between the trees...
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Over the years, the castle was modernized and updated. This included the tower, whose heavy line of the fortified wall was broken by irregular window and door arrangements. The castle still houses remarkable works of art. The neo-Gothic armory houses a cast-iron stove from 1539 and two marble Renaissance mantelpieces. The castle also contains important paintings, tapestries, gold leather wallpaper, and furniture in a variety of styles. (Municipality of Westerlo)
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There are over 45 mountain bike trails in Demervallei Tussen Aarschot En Diest. The komoot community has rated these routes with an average of 4.6 stars, indicating a high level of satisfaction with the diverse terrain and scenic paths.
The region offers a varied topography, transitioning from the flat Kempen region to the undulating Hageland. You'll encounter a broad river valley with the winding Demer river, distinctive sand-lime hills (Diestiaanheuvels) to the south, and land dunes to the north. This mix provides sandy stretches, challenging climbs, and extensive natural reserves with forests and marsh areas, making for dynamic mountain biking.
The trails in Demervallei Tussen Aarschot En Diest cater to various skill levels. Out of 48 routes, 8 are classified as easy, 33 as moderate, and 7 as difficult. This means there are plenty of options for both casual riders and those seeking a challenge.
Yes, there are several routes suitable for beginners. The region offers 8 easy mountain bike trails, providing a gentle introduction to the area's diverse landscapes without overly demanding climbs or technical sections.
While riding, you can explore various natural features and landmarks. Consider visiting the Entrance to Demerbroeken Nature Reserve or the Iron Sandstone Quarry Demerbroeken. The De Kuilen bird hide is also a great spot for wildlife viewing. The Voortberg in Testelt, though not a highlight in our data, is known for offering panoramic views over the Demervallei.
Yes, many of the mountain bike trails in the region are circular, allowing you to start and end at the same point. An example is the Singletrack Between Posts β Heath Windmill Zelem loop from Testelt, which is a 55.4 km route traversing varied landscapes.
The varied terrain, including forests and marsh areas, makes the Demervallei enjoyable for mountain biking throughout much of the year. Spring and autumn offer pleasant temperatures and vibrant scenery. However, it's always a good idea to check local weather conditions, especially after heavy rain, as some unpaved paths might become muddy.
While specific family-friendly routes are not explicitly detailed, the presence of 8 easy trails suggests there are options suitable for families. These routes typically feature less elevation gain and smoother paths, making them more accessible for younger riders or those with less experience.
The region includes historical attractions like the watermills of Testelt and Zichem, which often have nearby facilities. While specific cafes are not listed in the route data, the area's popularity for outdoor activities suggests that towns and villages along the trails, such as Testelt and Zichem, will offer places to rest and refuel.
The area is highly rated by the komoot community, with an average score of 4.6 stars from over 120 reviews. Riders often praise the diverse terrain, which includes a mix of river valleys, sand-lime hills, and forest paths, providing engaging experiences for different ability levels. The extensive natural reserves and unpaved surfaces are also frequently highlighted.
A popular moderate-difficulty route is the Heath Windmill Zelem β Singletrails in Klein Bosje loop from Testelt. This 39.1 km trail guides riders through forests and open areas, featuring engaging singletrails and an elevation gain of about 173 meters.
Yes, for experienced riders seeking a longer challenge, the Averbode Abbey β De Merode Castle, Westerlo loop from Testelt is a great option. This route covers 61.7 km with moderate elevation, offering an extended ride through varied landscapes.


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