Coffee Beans and coffee cupTo keep coffee fresh, keep it in a cool, dry, dark area of your kitchen but not in the refrigerator. I was raised believing the refrigerator was the best place to keep ground coffee until ready to use it -- my mother and grandmother both did that.
When to Refrigerate Coffee -- Never, unless you are conducting a science experiment on how long it takes to ruin perfectly good coffee. The fridge is one of the absolute worst places to put coffee.-- source: coffeeam.com
Valve-Sealed Bags are best. I have bought vacuum-sealed beans many times thinking such beans stay fresh longer. Wrong again. Now I know to look for bags that are sealed with valves.
Vacuum-sealed coffee does not equal fresh coffee. When coffee is roasted, it releases carbon dioxide and continues to release it for days afterward. Fresh-roasted coffee can be packaged in valve-sealed bags to allow the gasses to escape and will taste best about 48 hours after roasting.-- coffeam.com