If arriving via a track from Cazeaux-de-Larboust, park to the right of the track, above Les Granges de Labach.
(S/E) Walk a few steps along the track before you see a sign on the right indicating the Col de la Coume. Follow the direction of this sign, which directs you to take a path that climbs through the forest vegetation.
(1) As you emerge from the forest, the path continues to climb, quite steeply at times, before joining the track at the Col de la Coume.
(2) Admire the view from the Col de la Coume, then take the track to the right for just a few steps to discover a splendid panorama of the Oô valley, dominated by the Pic des Spijeoles. Retrace your steps back to the pass before taking the track to the left this time to descend into the valley and reach a three-way junction.
(3) Ignore the path on the right, which leads to a dead end, and stay on the track. Follow this track to Granges de Labach (S/E).
We had a nice chat with the owners of the barns we met there.
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Access by car to the starting point is via a stony but passable track towards the end.