mid june till end of august.
for park riding u need to check out Les 2 Alpes, Zermatt, Saas-Fee, Dachstein, Hintertux, Sölden and maybe Tignes since they are moving the park to the top of the glacier now maybe they get it right this time.
anyway plenty of shit to do in the summer and better parks than 90% of the winter resorts in Europe. Better weather too and less idiots.