Freshness is critical to a quality cup of coffee. Experts agree that coffee should be consumed as quickly as possible after it is roasted, especially once the original packaging seal has been broken.
While there are different views on whether or not coffee should be frozen or refrigerated, the main consideration is that coffee absorbs moisture – and odors, and tastes – from the air around it, since it is hygroscopic (bonus vocabulary word for all the coffee geeks out there).
Most home storage containers still let in small amounts of oxygen, which is why food stored a long time in the freezer can suffer freezer burn. Therefore, if you do refrigerate or freeze your beans, be sure to use a truly airtight container.
If you choose to freeze your coffee, quickly remove as much as you need for no more than a week at a time, and return the rest to the freezer before any condensation forms on the frozen coffee.
Freezing your beans does not not change the basic brewing process.
Never reuse your coffee grounds to make coffee. After brewing, the desirable coffee flavors have already been extracted and leave only the bitter ones behind.