We went to the Dachstein Ice Caves this past weekend, and it was the first time we'd seen snow since March. It was weird to be swimming at our pool one day and freezing in the mountains the next.
Here's a tip, though: if you go to Dachstein, bring extra jackets, hats, mittens, etc. We did not dress appropriately and were freezing the whole time. But it was so fun nonetheless -- a great day trip if you're in or around Salzburg.