The guys over on CoffeeGeek did a huge experiment involving freezing coffee. The results were basically that there is no noticeable difference between coffee that was frozen and coffee that was ground/brewed that week. There were some important findings though. Your container has to be air tight, because moisture is the #1 killer of frozen coffee. It's not enough to just put it in a ziplock bag. The coffee in the experiement was vac sealed to get all the air/moisture out. The second thing was that you had to allow the coffee to defrost before grinding/brewing. So there is a bit of information on freezing coffee. Of course if your coffee is stale, then it's stale. Freezing or not will not help it. If it's already ground when you buy it, then it's already stale when you use it. If your whole bean coffee has a 'Use by' date on it, then it is most likely already stale also. You need a 'Roasted on' date, not a 'Use by' date.
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