Lac d'Oô from Granges d'Astau

Description

From the Granges d'Astau car park above Luchon, a wide forest track and then a stony path waymarked in white and red climb to Lac d'Oô, at 1,507 m. On the way, the Chevelure de Madeleine waterfall drops on your right; you pass the sulphur rock at about 1,300 m, then a small stone bridge before the dam. From the hut on the shore you face the Lac d'Oô waterfall, 275 m high according to Haute-Garonne Tourisme. You return the same way. Our track measures 6.6 km round trip with 378 m of ascent. The official sheets give 6.5 to 6.6 km and 448 m: the gap in ascent comes from the calculation, since our method applied to the official track also gives 379 m. The hut is open from early May to late October, and dogs are allowed on a lead. Swimming is banned in the mountain lakes. In winter the route is not advised because of icy sections and avalanche gullies.

Difficulty

Official rating: moderate, by Haute-Garonne Tourisme (fiche 41, le lac d'Oô).

Before you go

• In winter: icy sections and avalanche gullies, route not advised.
• Swimming is banned in the mountain lakes.
• Dogs allowed on a lead.

Getting there

Start: Granges d'Astau car park, just past the restaurants, Oô (31).

By car: From Bagnères-de-Luchon, D618 then D76 through Oô village to Granges d'Astau.

By public transport: Luchon station, then the Lipy 1 bus in July and August.

Season

1 April to 30 November depending on snow (Haute-Garonne Tourisme). The hut is open from early May to late October. Not advised in winter.

Sources

• Track: © OpenStreetMap contributors, ODbL 1.0 (www.openstreetmap.org/copyright). Time estimated by GPX Path with the Mac app rule, breaks not included.
• Official time: 3 hr, tourisme-occitanie.com
• Official elevation gain: 448 m, CRT Occitanie
• 41, le lac d'OôHaute-Garonne Tourisme, accessed 27 October 2026
• Randonnée au lac d'OôCRT Occitanie, accessed 27 October 2026
• Lac d'Oô (site naturel, 1 507 m)CRT Occitanie, accessed 27 October 2026