Head towards the Bastan Valley via Luz-Saint-Sauveur. Pass the village of Barèges and continue for 3 km on the RD 918. Reach the car park at the Tournaboup winter sports resort. If the RD 918 is open beyond this point, continue uphill towards the Col du Tourmalet. The road runs alongside a ski run called "Bastan". Drive as far up as possible to the last hairpin bend before Super Barèges (Cabanes de Stouets).
Wherever the road is blocked (which varies depending on the season and snow conditions), park on the hard shoulder. Continue along the road and put on your snowshoes (or skis) as soon as possible.
On this route, the start is from the small car park at the final hairpin bend, at an altitude of 1,629 m.
(S/E) Depending on where you park: if at the Tournaboup car park, take the Bastan track in reverse; or if on the hard shoulder of the RD 918 (as on this route), take theGR®®10C which branches off to the left of the road, or follow the RD 918 (closed to traffic), or if parked at the final hairpin bend at 1,629 m, cut across the lower part of the Plat de Monhaillat and Montaquéou to join theGR®®10.
(1) Almost in the thalweg of the Ruisseau d'Aoube, climb the slope on the left bank (the right bank is also passable). Pass by the Cabanes d'Aoube, on the plateau of the same name. Climb due north at the bottom of the Vallon de l'Aouda, keeping the Bonida mountain well to your right
(2) Pass the western valley of the Col d'Oncet on your right and continue north-west towards the Col d'Aoube.
The ascent to the pass follows the northern side of the valley, via a series of tight hairpin bends. Reach the Col d'Aoube (2,369 m).
(3) Head north-west initially to avoid the first rocky outcrop below the pass, then climb in switchbacks towards the summit, clearly visible on the right. The final part of the ascent follows the ridge line between the pass and the summit.
(4) Leave the pass heading south-south-west, then follow the top of a rocky massif to head westwards.
(5) Once past the rocky outcrops, head south-west, then south, to reach the bottom of the valley and rejoin the Tourmalet-Lac Bleu summer path.
(6) Follow this path, hidden beneath the snow, westwards, until you reach the entrance to the Col de Bédéra valley, at an elevation of 2,236 m.
(7) Enter the valley, climbing up the right-hand bank. Join the summer path leading to the Col de la Bédéra.
Reach the Col de la Bédéra (2,404 m).
(8) The descent from the south-facing pass can be tricky depending on snow conditions. The cornice faces south. There are often ‘whale’s mouths’ beneath the cornice. The most obvious route is generally to the east of the pass. Head down towards Lac de la Lahude, hidden behind a small promontory, which you go round to the west via its spillway, partially or completely covered by snow. Head south-west into the Ruisseau de la Mousquère ravine, a narrow corridor of boulders and deep snow. Reach a flat area where you must leave the ravine (the rest of the ravine is very difficult to traverse).
(9) Head towards the Cabanes du Plateau d'Aoube to the south-east. Cross through the middle of the huts. Find a rounded ridge with a few shrubs, junipers and mountain pines, which leads down to the car park (S/E).