Just a short ride from central Brussels, the Sonian Forest (Forêt de Soignes / Zoniënwoud) and Hallerbos (Haller Forest) offer two of the most enchanting nature escapes in Belgium. The Sonian Forest, a UNESCO World Heritage site, spans over 4,400 hectares across the Brussels-Capital Region, Flemish Brabant, and Walloon Brabant. Its beech-dominated canopy provides year-round tranquility, with well-marked trails for walkers, cyclists, and runners. Hallerbos, located about 15 kilometres south of Brussels near the town of Halle, is famous for its spectacular spring display of bluebells (Hyacinthoides non-scripta), which draw thousands of visitors each April and May. Both forests are managed by the Flemish Agency for Nature and Forests (ANB) and are free to enter.
Getting There: Public Transport and Cycling
The Sonian Forest is easily reachable by STIB public transport. Tram lines 94 and 8 stop at key entry points like the Bois de la Cambre (Ter Kamerenbos) and the Université Libre de Bruxelles (ULB) campus. From the Bois de la Cambre, you can walk directly into the forest. For Hallerbos, take a train from Brussels-Midi (Brussels-Zuid) to Halle station (about 15 minutes, €4.40 one-way with a standard ticket). From Halle station, bus 114 (De Lijn) runs to the forest entrance at Vlasmarktdreef, or you can walk 30 minutes along marked routes. Many visitors also cycle: the Sonian Forest has over 100 km of dedicated bike paths, and the cycling network in Brussels connects directly to the forest via the Canal and the Green Walk (Promenade Verte). Bicycle rental at Brussels-Midi costs around €15 per day from companies like Blue-Bike or Villo! stations near the forest edges.
Hallerbos: The Bluebell Spectacle
Hallerbos covers about 552 hectares and is one of the best places in Europe to see a bluebell carpet. The display usually peaks between mid-April and early May, depending on weather. The ANB recommends visiting on weekdays or early morning (before 10:00) to avoid crowds. Entry is free, but parking costs €6 per car at the main lot on Vlasmarktdreef. To protect the fragile flowers, visitors must stay on designated paths. The three main walking loops are:
- Blue Route (2.5 km) – Easy, flat loop through the densest bluebell areas. Perfect for photography.
- Red Route (4.5 km) – Moderate, with some gentle slopes and a mix of bluebells and ancient oaks.
- Yellow Route (7 km) – Longer, passing through younger forests and a small pond; less crowded.
All routes are well signposted. The forest also has a small visitor centre (open weekends in April–May) with maps and information. Note that dogs must be leashed during bluebell season (April–June).
Best Photo Spots in Hallerbos
For iconic shots, head to the “Cathedral” area near the intersection of the Blue and Red routes, where tall beeches frame a carpet of blue. The morning light (7:00–9:00) is best. A tripod is useful for low-light shots under the canopy. Many photographers use a polarizing filter to reduce glare on the leaves.
Sonian Forest: Year-Round Wilderness
The Sonian Forest is much larger and offers diverse landscapes: ancient beech groves, oak-hornbeam woodlands, heathlands, and several ponds. It is part of the UNESCO World Heritage “Ancient and Primeval Beech Forests of the Carpathians and Other Regions of Europe”. The forest is crisscrossed by over 300 km of trails. Key entry points include the Bois de la Cambre (near Avenue Louise), the Rouge-Cloître (Rood-Klooster) in Auderghem, and the Kapucijnenbos near Tervuren. The Rouge-Cloître site has a café, restaurant, and a small lake with rowboat rentals (€8 per hour).
Walking and Hiking Trails
The ANB maintains several colour-coded walks. The most popular is the Groene Wandeling (Green Walk), a 7 km loop from the Kapucijnenbos parking lot. It passes through the Drève de l’Infante, a straight avenue lined with ancient beeches. Another highlight is the Drève des Deux Montagnes (Two Mountains Drive), a 5 km stretch with rolling hills. For a longer hike, the Promenade Verte (Green Walk) around Brussels includes a 15 km section through the Sonian Forest. Detailed maps are available at the ANB website or at the information panels at major entrances.
Cycling and Horse Riding
Cyclists can use the dedicated bike lanes on the Drève de la Ramée and Drève de Lorraine. Mountain bikes are allowed on marked trails only. Horseback riding is permitted on designated bridle paths; rentals are available at the Manège de la Forêt de Soignes in Tervuren (€30 per hour, booking required).
Seasonal Highlights and Wildlife
Spring (April–May) is peak bluebell season in Hallerbos and also brings wild garlic (ramsons) and wood anemones in the Sonian Forest. Summer (June–August) offers dense green canopy and cooler temperatures; the Sonian Forest is a popular spot for picnics and birdwatching. Autumn (September–November) sees the beech leaves turn golden, with spectacular colours in the Drève de l’Infante. Winter (December–February) provides clear views through bare trees, and occasional snow transforms the forest into a quiet wonderland. Wildlife includes fallow deer, red foxes, and over 100 bird species such as the middle spotted woodpecker and the European nightjar. The ANB organizes guided nature walks (€5 per person) on select weekends – check their calendar.
Practical Tips for Visitors
- Footwear: Wear sturdy walking shoes or boots, especially after rain. Many paths are unpaved and can be muddy.
- Facilities: Public toilets are available at major entrances (Bois de la Cambre, Rouge-Cloître, Kapucijnenbos). In Hallerbos, portable toilets are placed near the parking lot during bluebell season.
- Food and Drink: Several cafés operate in the Sonian Forest: the Chalet Robinson at Bois de la Cambre (open daily, salads and pasta €12–18), the restaurant at Rouge-Cloître (€15–25 for mains), and the Brasserie de la Forêt in Tervuren. In Hallerbos, the nearest options are in Halle town centre (10-minute walk). Pack a picnic to enjoy at designated areas.
- Parking: Sonian Forest parking lots (e.g., Kapucijnenbos, Drève de la Ramée) charge €3 on weekdays, €5 on weekends. Hallerbos parking is €6 per car, credit cards accepted.
- Accessibility: The Blue Route in Hallerbos is wheelchair-friendly (compacted gravel). In the Sonian Forest, the Drève de l’Infante is accessible, but many trails have roots and slopes.
- Dogs: Dogs must be leashed year-round in Hallerbos; in the Sonian Forest, they can be off-leash except in designated nature reserves (marked on maps).
Combining with Other Activities
Both forests are close to Brussels, making them ideal for a half-day trip. After a morning walk, you can head to the nearby town of Tervuren to visit the Royal Museum for Central Africa (€12 adult, closed Mondays) or the park of Tervuren with its large pond. In Halle, the Basilica of Saint Martin (free entry) and the Saturday morning market (7:00–13:00) are worth a stop. For food, Brussels’ best brunch spots are a short train ride away, or you can grab a beer at one of the local craft beer bars in the city centre. If you prefer a longer day out, the walking routes in the Sonian Forest can be extended to link with the urban gardens of Auderghem or the street art trail in Ixelles.
Conservation and Etiquette
Both forests are protected areas. Do not pick flowers, including bluebells. Stay on marked trails to avoid trampling vegetation. Take all litter home. Fires and barbecues are strictly forbidden. Respect quiet zones – keep noise low to avoid disturbing wildlife. The ANB enforces fines up to €250 for violations. In Hallerbos, drones are prohibited during bluebell season to prevent disturbance.