Obviously, the peak time to visit the Snowy Mountains region is winter. The snow resorts typically open on the Queen's Birthday long weekend in June and try to stay open until the Labour Day long weekend in October. For the best of the winter conditions (i.e. snow) aim to visit the Snowy Mountains in late July and/or throughout August. But don't rule out the Snowy Mountains in the summer months either. The national parks are a great place to explore in the warmer months also.