If your bag remains unopened, the coffee will still taste fine for many months after roast. Coffee degases as it ages, loosing some vibrancy. Remember to re-seal your bag or use an alternative air tight container. Resting time is an important aspect of coffee brewing, so make sure you experiment to find out what period of time to wait beyond the date of roasting. For espresso, we recommend between 1 & 2 weeks resting, for filter, we can recommend a shorter resting period.