The classic Béarn mountain circuit around the iconic Pic du Midi d'Ossau (2,884m)—one of the most beautiful and challenging day hikes in the Pyrenees. The route passes the Lac de Peyreget and Lac Bersau with extraordinary views of the twin-peaked summit throughout.
The Pic du Midi d'Ossau (2,884 m) is one of the most recognisable summits in the French Pyrenees, its twin-peaked silhouette rising above the Béarn region of Nouvelle-Aquitaine in the Pyrénées-Atlantiques. The classic 15-kilometre circuit begins at the Lac de Bious-Artigues, reached from Laruns via the D934; a car park with paid spaces serves the trailhead in summer. On peak-season weekends the access road is restricted to non-residents and a shuttle bus operates from Laruns village. From the car park the trail climbs through open mountain meadows past the Lac de Bious-Artigues before ascending steeply to the Col de Peyreget and the luminous Lac de Peyreget, set in a rocky bowl directly beneath the mountain's north face. The circuit continues over the Col Long de Magnabaigt before descending to the equally spectacular Lac Bersau, ringed by high ridges and offering unobstructed views of the peak throughout. Total elevation gain is approximately 1,200 metres, making this a demanding but well-rewarded day. The terrain varies between compacted earth, large boulders, and loose scree on the upper approaches to the cols. There is very little shade above the treeline and the route is fully exposed; afternoon thunderstorms develop rapidly in July and August. Waymarking follows the GR10 in red and white throughout; signage is reliable but can be obscured by early-season snow, and a start of no later than 7:00–8:00 is strongly advisable to clear the exposed high terrain before early afternoon. Isards (Pyrenean chamois) are frequently spotted on the surrounding slopes, and golden eagles and griffon vultures circle the summit regularly. The CAF-managed Refuge de Pombie, on the south side of the mountain at approximately 2,000 metres, is staffed from June to late September and offers meals and dormitory accommodation; advance reservations are essential for summer weekends. No permit is required for day hiking. Water is available from streams and the lake shores; treatment before drinking is recommended.
Trail facts
- Trail area
- Laruns, Pyrénées-Atlantiques
- Best season
- Late June to late September
Highlights
- Lac de Peyreget
- Lac Bersau
- Eagle sightings
- Isard (Pyrenean chamois)
Tips for visiting
- Start from the Lac de Bious-Artigues trailhead no later than 8:00 in summer to clear the exposed cols before afternoon thunderstorms develop.
- On peak-season weekends the access road is closed to private vehicles; take the shuttle bus from Laruns village.
- Trekking poles are useful on the rocky descent from Col de Peyreget where loose scree can be unstable when wet.
- Book the Refuge de Pombie well in advance for summer weekends if planning an overnight circuit.
- Carry at least 2 litres of water; refill at the lake shores or treat from streams.
When to visit
July and August offer snow-free cols and staffed refuges, though afternoon thunderstorms are frequent; June and September are typically quieter and often drier on the high section.
Accessibility
The Pic du Midi d'Ossau circuit involves sustained rocky and uneven terrain, significant elevation change over 1,200 metres, and loose scree sections at the cols. It is not accessible for wheelchair users or strollers at any point on the route.
Frequently asked questions
Is the Pic du Midi d'Ossau summit itself accessible on this circuit?
The summit requires technical rock climbing at Grade 3–4 and is not included in the standard hiking circuit. The route rings the mountain at col level and provides exceptional views of the peak without technical climbing.
When does the access road to Lac de Bious-Artigues open each year?
The road typically opens from late May or early June depending on snowmelt and closes by November. In peak summer, weekend access by private vehicle is restricted and a shuttle bus operates from Laruns.
Is the Refuge de Pombie open year-round?
The Refuge de Pombie is staffed from June to late September. Outside this period the refuge is unguarded and hikers must be fully self-sufficient with food, sleeping gear, and emergency equipment.
Are dogs allowed on the trail?
Dogs are permitted but must be kept on a leash to protect wildlife and livestock. Pyrenean mountain dogs guard sheep flocks in the area and encounters with these large herding dogs are common above the treeline.