Should you let coffee rest after roasting?
You've just purchased a freshly roasted coffee, and your first instinct is probably to make a cup right away. However, in the world of specialty coffee, we often talk about one essential step: resting after roasting , also called "degassing." Why do you sometimes have to wait a few days before enjoying your coffee? Here's what you need to understand.
What is degassing?
During roasting, the coffee bean undergoes profound chemical transformations. One of these is the production of gases, mainly carbon dioxide (CO₂), which remain trapped within the structure of the bean.
After roasting, this gas gradually escapes from the bean. This natural phenomenon is called degassing.
Why let coffee sit?
-
Avoid unstable extractions
Coffee that still releases too much CO₂ will disrupt the brewing process, creating bubbles and preventing the water from flowing evenly through the grounds. The result: an unbalanced extraction and an inconsistent cup. -
Stabilize the aromas
Resting allows the aromas to develop and harmonize. Coffee that's too fresh can feel hollow, aggressive, or lacking in complexity. -
Improve crema into espresso
Slightly rested coffee produces a more stable and finer crema, as the gas no longer causes excess foam.
How long is the wait ?
The ideal length of time depends on the roast type, extraction method, and sometimes even the coffee profile.
| Type of coffee | Recommended rest time |
|---|---|
| Espresso | 7 to 14 days after roasting |
| Filter coffee | 3 to 7 days after roasting |
| Very dense coffees (Kenya, Ethiopia) | Up to 14 days for full expression |
A filter coffee can be enjoyed sooner, while for an espresso, waiting one to two weeks generally allows for better control of the extraction.
Is there a risk in waiting too long?
Yes and no. Coffee continues to age after degassing, even under good storage conditions. Several weeks after roasting, even when properly stored, a coffee will begin to lose its aromatic complexity.
The idea is therefore to find the right compromise: let it rest long enough to degas, without waiting to the point of losing its freshness.
How to store your coffee during this period?
- Use an airtight container
- Store it away from light, air and humidity.
- Avoid storing in the refrigerator to avoid condensation.
Some coffee bags are equipped with one-way valves: these allow CO₂ to escape without letting oxygen in, which is perfect during the resting phase.
Conclusion
Even if you can't wait for a freshly roasted coffee, a few days of rest can transform your experience in the cup. Coffee is a living product: giving it time to stabilize respects all the work that goes into it from field to roasting... and offers you a tasting experience at its best.
To continue reading: can you make good coffee with a capsule machine?
