You’ve just taken delivery of a bag of freshly roasted coffee. It smells incredible. Every instinct is telling you to crack it open right now. So why do some people say you should wait?
It comes down to something called degassing. When coffee is roasted, the beans trap a significant amount of carbon dioxide inside them. In the days after roasting, that CO₂ slowly escapes. Brew too early and all that gas interferes with the extraction — the water can’t properly saturate the grounds, the flavour comes out flat or oddly sharp, and you’re not getting the best the coffee has to offer.
In short: the coffee isn’t ready yet. Not because anything is wrong with it. Just because it needs a moment to settle.
So how long are we actually talking?
It depends on the coffee and how you’re brewing it, but here’s a rough guide most roasters and home brewers tend to agree on:
- Filter coffee (pour over, batch brew, cafetière): around 5–14 days after roast date
- Espresso: longer — usually 10–21 days, sometimes even a touch more for darker roasts
Espresso needs more time because the brewing method is so intense. High pressure, fine grind, very short contact time — it amplifies everything, including any harshness from beans that haven’t fully degassed. Filter is more forgiving.
Lighter roasts also tend to need a bit more resting time than darker ones. Darker roasts degas faster because
