You've built your dream setup for all your at-home brewing needs. You've secured the bag of your favorite whole bean coffee. You've woken up on a lazy Sunday and it's time to make the perfect cup. Or is it?
The roast date of a coffee plays a crucial role in the way the taste profile is experienced, or in some cases, not experienced. When green coffee goes through the roasting process, several chemical reactions are taking place simultaneously. However, for the purpose of deciding when to brew an optimal cup, we'll stick to the science post-roast. And that begins with the degassing phase.
Immediately following green coffee going through the roasting cycle, the beans begin to emit carbon dioxide in a process known as degassing. It is because of this process that there are actually instances of coffee being 'too fresh'. Say you buy a bag of beans directly from a roaster that roasted the beans the day before. This degassing process is still going to be occurring and can, in turn, suppress the full flavor profile of the bean.
(pictured above: a coffee roaster at Methodical Coffee)
On the other end of the spectrum, oxidation or the beans exposure to oxygen over time, is what leads to 'expired' coffee. When we say expired we do not mean unusable, as coffee can last for months and months when stored under the right conditions. Instead, we mean that the flavor profile has been compromised and that you are more prone to experiencing a 'flat' cup.
OKAY, SO WHEN DO I DRINK MY COFFEE!?!?: most coffee experts agree that anytime between 7 days to 28 days (one to four weeks) from roast date is the most ideal range for the flavor profile to shine through and for the whole bean coffee to reach peak freshness. During this time, most of the carbon dioxide from the roasting process has been emitted and the beans interaction with oxygen has not yet degraded the desired profile. (NOTE: One key factor to this timeline is keeping any opened whole bean coffee in an air tight or resealable container.)
Time to drink up! (If it's 7 to 28 days off roast date, that is.)