The LHBS gave me 1lb of outdated Magnum whole hops. They are still in their 2oz aluminum baggies, are now 5 years old, and are still very pungent when opened. Someone at HopUnion told me pellets will keep a couple of years in the freezer, leaf hops...about a year. Frankly, I think they keep well much longer if vacuum sealed in the freezer.