TL;DR:
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Coffee beans need time to release trapped carbon dioxide (degassing) before they are ready for espresso.
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Medium to dark roasts usually need 7-10 days of rest, while lighter roasts perform best after 10-14 days.
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Brewing too soon results in a bubbly, uneven extraction and a sharp, harsh taste in your cup.
There is a common misconception in the coffee world that the moment beans leave the roaster, they are at their absolute peak. While freshness is incredibly important, espresso is a unique brewing method that demands patience. Here at Chipp Coffee Co., Zach has spent over a decade roasting and tasting coffee, and the number one piece of advice he gives to both our wholesale partners and home baristas is simple: let the coffee rest.
Let's dive into the "why" and "how" behind the optimal resting time for espresso.
What is the optimal resting time for espresso?
The optimal resting time for espresso is typically between 7 and 14 days after the roast date. Medium to dark roasts usually peak around 7 to 10 days, while lighter roasts benefit from a longer rest of 10 to 14 days to fully degas and develop complex flavour profiles.
During the roasting process, carbon dioxide (CO2) builds up inside the coffee bean. For the first few days after roasting, the beans are rapidly releasing this gas—a process known as degassing. Because pulling an espresso shot involves forcing pressurised water through a compacted puck of coffee, any trapped gas will fight against the water. If you brew too soon, the CO2 acts as a barrier, causing channeling (where water finds the path of least resistance) and leading to an under-extracted, violently bubbly shot that tastes sharp and sour.
Why do different roast profiles require different resting times?
Different roast profiles require different resting times because roasting breaks down the cellular structure of coffee beans. Darker roasts are more porous, allowing carbon dioxide to escape rapidly within a week. Lighter roasts remain denser, holding onto trapped gases and requiring up to two weeks to degas properly.
Think of a coffee bean like a tiny sponge. The longer it spends in the roaster, the more porous that sponge becomes.
When you pick up a bag of our Highwire espresso blend—which features a slightly more developed, crowd-pleasing roast profile—you’ll find it hits its sweet spot beautifully around day 7 to 10. The rich chocolate and caramel notes settle in perfectly. On the other hand, if you're brewing something bright and vibrant like our Sweet Penny, which we roast a bit lighter to highlight its complex fruit notes, you really want to practice patience. Give it a full 10 to 14 days. The dense structure of a light roast means it holds onto those gases tightly, and waiting allows the acidity to soften into a beautiful, rounded sweetness.
How can you tell if your espresso has rested enough?
You can tell your espresso has rested enough by observing the extraction and tasting the shot. A well-rested espresso pours smoothly with a rich, stable crema, rather than thick, foamy bubbles. Taste-wise, the harsh acidity and sharp, generic roasted notes will settle into balanced, distinct, and sweet flavour characteristics.
If your espresso looks like it's exploding out of the portafilter basket, or if the crema is unusually thick, pale, and dissipates rapidly, your coffee is likely too fresh. A well-rested shot will extract with a slow, syrupy drip that turns into a steady "mouse tail" stream.
Zach’s Pro Tip: What happens if you run out of coffee and absolutely must brew a bag that’s only 3 days off roast? You can cheat the system slightly. Drop your espresso machine’s PID temperature by 1-2°C and significantly increase your pre-infusion time (if your machine allows it). The cooler water and longer, gentle soak help to mitigate the harsh, metallic "carbonic bite" of the trapped CO2, pulling a much smoother shot from overly fresh beans.
When it comes to great espresso, patience is just as important as your grinder and machine. Let your beans breathe, and they'll reward you with the beautiful, balanced flavours we worked so hard to roast into them.
Ready to put this knowledge to the test? Grab a fresh bag from our espresso collection at chippcoffee.co.uk and taste the difference a proper rest makes!
