In Pakistan, ski season is around February till maybe first week of March.
Good public place is Malam Jabba and not-so-organized are Ayubia and Nathia gali. There is no guarantee that roads will be clear till Malam Jabba in winter though.
PAF operates Naltar and Kalabagh ski bases and Naltar offers limited membership to civilians as well.
Army operates quite a few locations in Burzil, Rattu and Astore but it is not commercial and maybe u can get there through army contacts.
In summer, snow remains usually above 14000 ft and all above locations are grassy pastures / meadows in summer.