4.3
(198)
1,806
riders
62
rides
Mountain biking around Hoeilaart is centered on the expansive Sonian Forest, a UNESCO World Heritage site known for its ancient beech forests and diverse ecosystems. The terrain features a mix of technical tracks on eolian loam, gravel paths, and occasional singletracks, providing varied riding conditions. This region offers a network of mountain bike trails that traverse dense woodlands and picturesque valleys, with some sections requiring advanced skills. The landscape is characterized by its largely untouched soil and rich flora, making it a significant natural area for outdoor activities.
Last updated: August 25, 2026
4.7
(66)
257
riders
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
4.8
(4)
137
riders
78.2km
05:29
730m
730m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.

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4.3
(12)
79
riders
50.8km
03:04
260m
260m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
4.4
(23)
244
riders
39.3km
02:28
320m
320m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
4.7
(7)
251
riders
56.4km
04:08
660m
660m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
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This road is called Hakenstakendreef today and connects the current Groenendaal station with the tunnel under Sint-Jansberglaan, which leads you to the former racecourse (and the restored Royal Box). The Hakenstakendreef is incidentally mentioned in a building application as the "chemin d'accès" (access road) that led to the now-nonexistent Groenendaal-Hippodroom station. See https://hoeilaart.weleer.be/renbaan-groenendaal/2904 At the beginning of the avenue, you will find information boards about the forest; at the end, by the tunnel, is part of the former racecourse car park where this station once stood, and where racehorses, as well as people, were brought by train. You are therefore walking in a once very popular area, as at its peak, around fifty horse races were organized in Groenendaal (before the First World War). But you won't see much more than the gravel road and trees (until you reach the remains of the car park and the tunnel).
2
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Open grassy area with some benches, ideal for a break on dry days.
3
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The Duisburg Dolmen Stone is a large historical erratic boulder in Duisburg (a district of Tervuren). It is often associated with prehistoric rituals and may have been part of an ancient burial monument (dolmen), although this has not been proven with certainty. The stone is primarily considered a local archaeological and folklore monument, commemorating the very early settlement of the region.
3
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Narrow path next to the Voer. It can get quite busy, with lots of walkers, joggers, and horseback riders.
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Some parts of the paths are steep, some narrow with lots of wild raspberry bushes covered with spikes
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There are over 50 mountain bike trails around Hoeilaart, offering a variety of experiences. These include 13 easy routes, 32 moderate routes, and 10 difficult routes, catering to different skill levels.
The terrain around Hoeilaart, primarily within the Sonian Forest, features a mix of technical tracks on eolian loam (which can be slippery after rain), gravel paths, and occasional singletracks. You'll traverse dense woodlands and picturesque valleys, with some sections requiring advanced skills. The routes are often praised for their gravel paths, with some singletracks providing a more technical experience.
Yes, Hoeilaart offers several easy mountain bike trails perfect for beginners. An excellent option is the Grippensdelle MTB Singletrack – Sint-Corneliusdreef loop from Hoeilaart, an easy 26.0 km route that takes you through a mix of singletrack and forest paths within the Sonian Forest.
For experienced riders seeking a challenge, Hoeilaart has several difficult routes. Consider the Château de La Hulpe – Grasdelle Trail Clearing loop from Groenendaal, a demanding 79.3 km trail through the extensive Sonian Forest, or the De Voer Path – Singletrack trails in Plantsoenbos loop from Hoeilaart, an 83.1 km route with significant elevation gain.
Yes, all the featured mountain bike routes in Hoeilaart are designed as loop trails, allowing you to start and finish at the same point. This includes popular options like the De Voer Path – Forest Path loop from Hoeilaart, a moderate 50.8 km trail through varied forest landscapes.
The Sonian Forest is beautiful year-round. However, the eolian loam tracks can become quite slippery after rain, so drier periods are generally preferred. Spring and autumn offer pleasant temperatures and stunning natural scenery. Winter riding is possible, but be prepared for potentially muddy or icy conditions on some trails.
While mountain biking, you'll be immersed in the UNESCO World Heritage Sonian Forest, known for its ancient beech trees and unique ecosystem. You might also encounter picturesque areas like the valley of the Vuylbeek with its tranquil marshlands, or the valley of the "drowned children" featuring successive ponds. Nearby, you can find the Drowned Children Ponds and the Ponds of Tervuren Park.
Yes, the region around Hoeilaart and the Sonian Forest has several points of interest. You can find remnants of the Priorij van Groenendaal (Priory of Groenendaal) and the Koninklijke Loge (Royal Lodge). Additionally, the impressive Château de La Hulpe and Domaine Solvay are also nearby, offering a glimpse into the area's rich history.
Yes, for routes like Nero's Mountain Bike Route, parking is available at the municipal sports hall in Hoeilaart. Many other trailheads within the Sonian Forest also offer designated parking areas, though it's always good to check specific route details for the most convenient spots.
Hoeilaart is generally accessible by public transport, and some routes, particularly those starting near Groenendaal, might be reachable via train or bus connections from Brussels. It's advisable to check local public transport schedules and route starting points for the most convenient access.
The mountain bike trails in Hoeilaart are highly rated by the komoot community, with an average score of 4.4 stars from over 145 reviews. Riders often praise the diverse terrain, the immersive experience within the ancient Sonian Forest, and the variety of routes catering to different skill levels, from easy forest loops to challenging long-distance rides.
While the Sonian Forest itself is largely natural, there are often cafes and restaurants in the surrounding towns and villages, including Hoeilaart and Groenendaal, where you can refuel before or after your ride. Some routes might pass near these establishments, but it's best to plan your stops in advance.


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