title_body: How much does keeping beans vacuum sealed matter?
upvoted_answer: Coffee beans are freshest from about 12 to 48 hours after roasting until maybe one or two weeks later when stored properly in an airtight container.  During the early portion of this period (immediately after roasting to three or four days later) beans will be still giving off some gases, thus the reason for one way valves on coffee bags.  That being the case, vaccuum sealing can extend that time some, but not indefinitely.  Storing your coffee in the freezer actually makes the problem worse since the freeze thaw cycle drys the beans out and forces the oils to separate out of the beans.