Giving your coffee beans a little rest after roasting makes a big difference to your cup! Most beans benefit from resting for around 5–14 days after roasting, which gives excess carbon dioxide (CO2) time to escape. Without this, you can end up with a sharp, gassy, or uneven brew — and nobody wants that! While you can get away with as little as 24–48 hours in a pinch, light roasts really come into their own at 10–14 days or more, medium roasts tend to hit their stride at 5–10 days, and dark roasts are usually good to go after just 1–5 days — especially for espresso.
Here's a handy guide to recommended resting times depending on your roast and brew method. Light roasts need 10–14 days or more, as they take longer for CO2 to escape. Medium roasts are best left for 5–10 days. Dark roasts only need 1–5 days, though do keep in mind they can go stale a little quicker. If you're brewing filter or pour over, aim for 3–7 days. For espresso, 7–14 days is the sweet spot, though some high-end, light roast, or air-roasted beans can benefit from resting for up to 3–5 weeks.
So why bother resting your coffee at all? Firstly, it's all about degassing — freshly roasted beans are packed with CO2, and brewing too early can give you a bubbly, uneven extraction with muted, underwhelming flavours. Resting also allows those delicate flavours to develop properly and the body of the coffee to settle nicely. For espresso in particular, too much CO2 leads to excessive, unstable crema that can taste sour and harsh — not the silky shot you're after!
A few handy tips to get the most out of your rest: keep your beans in their original bag (most come with a one-way valve, which is ideal) or pop them in an airscape container. Store them somewhere cool and dark — the fridge or freezer isn't recommended. And if your coffee tastes a bit flat, it may have rested a touch too long and started to go stale, so it's worth keeping an eye on timing!
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