Unsure if your coffee beans are stale or not, America’s Test Kitchen has a fairly easy test that can tell you. Put some beans in a ziplock bag, press out all the air, and seal it overnight. If your beans are fresh (recently roasted – 7 to 10 days), then the bag will pop up because of the carbon dioxide released by the fresh beans. If there’s no pop, then your beans are probably past their peek freshness.
Remember you can keep your coffee beans at their peek freshness by storing them properly. Store beans that you will go through in the next twelve days in an air tight bag or container away from heat and light. For beans you want to keep longer, store in the freezer away from air and moisture.
Are Your Coffee Beans Fresh? | America’s Test Kitchen Feed
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