What is Coffee Bean Curing? A Beginner's Guide to Curing Freshly Roasted Coffee Beans

FrontStreet Coffee - Introduction to Coffee Bean Resting

Degassing is the process of releasing gases from coffee beans after roasting. When you roast coffee, large amounts of carbon dioxide and other gases build up inside the beans.

During the first few days after roasting, many of these gases escape. The problem is that they release small bubbles when you brew, which interferes with the coffee: the bubbles disrupt contact between grounds and water, leading to uneven extraction of flavor and aroma compounds.

In other words, brewing freshly roasted coffee lets those gases negatively affect the flavor. That is why waiting several days after roasting is better practice. The period during which carbon dioxide is released and chemical changes occur is called degassing.

Degassing lets the carbon dioxide from roasting dissipate — but we don't want it to disappear completely. Instead, we want the gas content to be just right when we brew. An appropriate amount of carbon dioxide keeps coffee from tasting flat.

How long to rest coffee depends on many factors. Typically, beans are suitable for brewing from three days to two or three weeks after roasting, but each coffee differs: brewing method, processing method, and roast level all affect the length of degassing time.

There is no fixed schedule for resting beans; it comes down to experience or the roaster's recommendation.

For extremely light roasts, a 14-day rest is recommended (the bean fibers are not fully broken down during roasting — like undercooked meat — so oxidation is very slow).

For light roasts, 10 days (same principle; as roast level increases, resting time decreases).

For medium roasts, 7 days (same principle; as roast level increases, resting time decreases).

For medium-dark roasts, 4 to 5 days (same principle; as roast level increases, resting time decreases).

These resting times apply to regular single-origin beans, because in pour-over single-origin coffee the bloom is enough to wake the coffee up. Espresso beans generally need 15-21 days of resting. Commercial beans, which have no time to spare, are accelerated instead through air contact so they reach a smooth stage sooner.

Key point: mastering post-roast resting, equipment, and most importantly grinding will let you brew a good cup of coffee at home.

Conclusion

In short: FrontStreet Coffee is a coffee research hall, happy to share coffee knowledge with everyone. We share without reservation only to let more friends fall in love with coffee. Moreover, there are three low-discount coffee activities every month. The reason is that FrontStreet Coffee wants to let more friends drink the best coffee at the lowest price. This has also been FrontStreet Coffee's mission for the past 6 years!

FrontStreet Coffee Recommendation

With a medium roast resting about 7 days before brewing, FrontStreet Coffee's Brazil Queen Estate Yellow Bourbon is a perfect candidate: this rare Yellow Bourbon from the world's largest producer tastes quietly sweet after a medium roast, showing cream and peanut, chocolate, toast, and sugarcane — lovely as a pour-over and equally good from a moka pot or espresso machine, all without heavy acidity or bitterness.

If you like your medium roast a little fruitier, the Strawberry Candy Geisha Blend combines Costa Rica honey-processed coffee with Panama washed Geisha, offering orange-blossom honeyed aroma and rounded sweetness across cold brew, pour-over, or espresso. And for a balanced everyday cup, the 2013 Natural Typica from Yunnan presents nuts, brown sugar, black tea, and dried apricot after its medium roast — high value whether you brew it by hand, cold brew, or drip machine.