If you store them in the freezer, don't use a ZipLoc for more than a month. Those are not O2 barrier, and you will get chessey hops. The vacuum pack bags are said to be O2 barrier bags.
On drying hops, 140F is what the commercial farms use to get the troughput they need. James Altweis claimed that low temps are better, as some of the essential oils can flash off at less than 140F.