All the links below will take to you to external sites. I have no control over their content, but I find them extremely useful.
Haute-Savoie Nordic
Information about all cross country ski areas and events in Haute Savoie.
http://www.savoie-haute-savoie-nordic.com/
Centre Nordique d'Agy
An extensive and challenging ski area, away from the noise and infrastructure of alpine skiing.
https://www.centrenordiqueagy.com/
Praz de Lys / Sommand
Cross country and alpine ski area, regularly used for national and international cross country competitions.
https://www.prazdelys-sommand.com/
Vallée du Haut-Giffre
Information about all the cross country ski areas in the Giffre Valley, updated daily.
http://www.valleeduhautgiffre.fr/domaine-nordique/infos-du-jour/
If you find any of these links are broken, please let me know so I can keep the information up to date.