
Canigou as seen from above Ria, where I was walking today. The snow on the western face is clearly visible, as is the ridge which runs from the Porteille to the summit.
Information from the Facebook page of the Cortalets Refuge updated by Thomas Dulac, the manager of the refuge, who climbed up to the summit today Sunday 21 May 2017.
From the Cortalets, no snow until you get to the fontaine de la Perdrix but the west side of the peak (Vernet) is covered in snow. It is possible to climb the ridge which goes directly from the Porteille to the summit (easy rock climbing) with classic mountain walking boots.
It is also appears to be possible to climb to the summit from the Cortalets via the Barbet, Porteille de Valmanya and the Cheminée, without crampons (not checked).
From Mariailles, no need for crampons (no snow on the Cheminéee).

Footprints on the mountains