Keep beans airtight and cool
To preserve your bean's fresh roasted flavour as long as possible, store them in an opaque, air-tight container at room temperature. Coffee beans are decorative and beautiful, but avoid clear canisters which will allow light to compromise the taste of your coffee. Keep your beans in a convenient, but dark and cool, location. Remember that a cabinet near the oven is often too warm, and so is a spot on the kitchen counter that gets strong afternoon sun. The commercial coffee containers in which you purchased your coffee are generally not appropriate for long-term storage. Ideal coffee storage canisters with an airtight seal are a worthwhile investment.
Coffee's Freshness over Time
Coffee begins to lose its freshness as soon as it is done roasting, and is at its peak in the first few days after it is roasted. Ground coffee is best when consumed within one to two weeks of roasting. Whole beans are best within one month of roasting. To keep your coffee fresh, buy just-roasted coffee often, in quantities that will only last you one to two weeks, and then store your coffee properly. If you want to buy a larger quantity of coffee, store the bulk of it tightly sealed in an airtight container in a cool, dark area and keep a smaller quantity in a smaller container for daily use. Only open the large container to refill the smaller container. Storing coffee this way will reduce air exposure for the larger portion coffee.
Vacuum-Sealed & Valve-Sealed Coffees
Vacuum-sealed coffee is allowed to age before it is sealed. (This is because coffee releases gas as it loses freshness, causing the packaging to expand and potentially even burst.).Vacuum-sealed coffee is intended for grocery store shelves and is not of the same calibre as fresh-roasted coffee. Valve-sealed coffee allows gasses to escape from the coffee packaging, but doesn't let any gasses in, so coffee can be packaged in it immediately after roasting. Valve -sealed coffee can be fresher than vacuum-sealed coffee, but fresh-ground coffee usually has the freshest flavor.Vacuum- and valve-sealed coffees are best within one to two weeks of opening.