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    Lac d’Oô

    This reflects the 10Adventures difficulty rating for each route. We aim to keep ratings consistent across regions.
    This reflects the estimated time the majority of users will take on this trail. If you are slower, add time to the top-end figure. If you are fast, then you may complete this route faster than this time range.
    This reflects the return distance of this route as measured by the GPS file.
    6.6 km
    This reflects the total elevation gained throughout this route as measured by the GPS file. This includes all ascents and descents, and is higher than what is quoted in most route guides, which simply measure the distance between the starting-point and high-point of the route.
    430 m
    User Ratings
    These ratings are completed by users who have completed this trail and not subject to reviews by 10Adventures.
    Overall Rating
    This is the average user-submitted overall rating on a scale of 1 to 10, with 10 being the highest.
    Physical Difficulty
    This is the average user-submitted rating on the physical difficulty of this route. In general, green is beginner, blue is intermediate, black is advanced/most difficult and double-black is expert-only. It is recommended that users build up to black and double-black routes.
    Easy (Circle)
    Suitable for beginners, families, young children, and those looking for a casual adventure.
    Technical Difficulty
    This is the average user-submitted rating on the technical difficulty of this route. In general, green is beginner, blue is intermediate, black is advanced/most difficult and double-black is expert-only. It is recommended that users build up to black and double-black routes.
    Easy (Circle)
    Suitable for beginners, families, young children, and those looking for a casual adventure.
    Read Reviews
    Directions to Trailhead
    Panorama from the Lac d'Oô hike in French Pyrenees

    The Lac d'Oô hike is a stunning hike in the Pyrenees. Imagine a lake surrounded by steep slopes, with a beautiful waterfall opposite of it. This is the Lac d'Oô, the second most visited natural site in the Pyrenees! Experienced hikers can also extend this hike to Lac d’Espiningo or the stunning Lac du Portillon.

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    Route Description for Lac d’Oô

    The hike to Lac d'Oô is a stunner. Starting from Les Granges d'Astau (1,140 m), head south on a gravel road, along the Val d'Astau. You go first through open, green fields where cows are grazing, then through a forest.

    While the path is definitely not designed for strollers, it is rather easy-going, so it may be suitable for young children who are used to do a bit of walking. The ascent is gentle and rather straightforward at the beginning.

    After approximately 2.0 km, the track steepens a bit and starts to zigzag. Make sure you stick to the wide, stony track and take the time for a breather here and there as the views of the valley open from time to time, with the bulky Montagne d'Espiau in the background.

    After a while, the track levels and then goes down and up again twice through the forest, with very steep ground to the right, before reaching a beautiful stone bridge at the foot of the dam. Cross the bridge to your right and head up (left) along the track to the Refuge du Lac d'Oô, which overlooks the end of the lake.

    Sit down on the rocks and enjoy the view! The level of water may vary according to the season; when the lake is full, the reflections of the surrounding slopes in the water are incredible. The waterfall is 275 m high and is one of the highest in the Pyrenees.

    If you have brought a picnic, this is the ideal place for it, otherwise, the refuge serves food and drinks daily throughout the season. This walk can be highly enjoyable any time of the year. In May (and usually even later), you can still see some snow on the higher tops which are visible behind the waterfall. In October you will be delighted by the amazing autumn colours of the beech trees to the left of the lake.

    You may be tempted to take a dip, though note that there is hardly a place to stand in the water as the bottom goes down very steeply.

    Return the way you came. You may notice some things you have not seen on the way up, including another high but very thin waterfall along the slopes to your left, as you come out of the forestry.

    Insider Hints for Lac d’Oô

    • If you get hungry or thirsty on the way back, why not stop at one of the two bar-restaurants opposite the car park, le Mailh d'Astau and l'Auberge d'Astau. L’Auberge d’Astau offers some lovely food at reasonable prices, including delicious organic trout filets from the local trout farm at Oô. If the weather turns a bit chilly you will surely enjoy sitting by the fireplace while enjoying your food or drink!
    • If you have the legs and enough time, take a longer walk to enjoy more of this majestic scenery. From the refuge by the lake, just walk back to cross the bridge and follow the GR10 to your right. It rises steeply through beautiful beech trees, with some amazing views over the lake and the waterfall. Keep following the GR10 until around the 1,910 m contour line, where it takes a sharp turn left N up the slopes. Leave it here, staying on the path leading S to the Col d'Espingo (1,967 m), where you will enjoy some great views over the Cirque d'Espingo, which is surrounded by a few +3,000 m peaks. From there, it is an easy stroll to the Lac d'Espingo and the Refuge d’Espingo, which also serves food in high season, and to the Lac Saussat, a great spot for picnic. This would add some 8.0 km return, with an extra 500 m ascent, so allow at least 3h return from the Lac d'Oô.
    • The fittest and most experienced hikers may want to go and explore even further to reach the Lac du Portillon at 2,670 m. The Refuge du Portillon provides some basic accommodation for the night (do not forget your duvet!) and normally serves food during the high season. The views over the Lac du Portillon, with the many +3,000 m peaks and their glaciers behind is absolutely stunning. The refuge can be the base for tougher expeditions to reach some of the higher peaks, the highest of the area being the Pic de Perdiguère (3,222 m), which stands on the Spanish border.

    Getting to the Lac d’Oô Trailhead

    From Luchon (also called Bagnères de Luchon), take the D618 in the direction of the Col de Peyresourde. After the village of Cazeaux-de-Larboust, turn left to take the D76 which will lead you to the village of Oô (pronounce "Oh"). Drive through the village and across the bridge to reach the hamlet of Les Granges d'Astau, where there is plenty of space available for parking.

    Route Information

    • When to do

      May to October

    • Backcountry Campsites

      Bivvy is permitted around the lake and higher, further S in the valley. Watch out for cows!

    • Toilets

      Oô (4km), Luchon (13km)

    • Family friendly


    • Route Signage


    • Crowd Levels


    • Route Type

      Out and back

    Lac d’Oô Elevation Graph

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    Lac d’Oô Reviews

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