From Fouillouse, the refuge is located on a variant of the GR 5. The classic summer path climbs up, then a balcony path leads to the refuge, which you will discover at the last moment. You can also take the GR 5 up to the Pas de la Couletta.
From Larche via the Mallemort or Portiolette passes, then the Vallonnet pass.
From Saint-Ours via the Col du Vallonnet.
From Maljasset via Italy.