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How to store coffee beans at home
How to store coffee beans at home: in their bag, folded over, somewhere cool and dark. Why the fridge does harm and when the freezer is worth it.
Store coffee beans whole, in the bag they came in, with the air pressed out and the top folded over, in a cool, dark cupboard away from the stove. Keep them out of the fridge. Use the freezer only for an unopened bag you will not open for months. That is the whole method, and it is the same advice we give in our FAQ.
The reasons matter. They tell you what to do when your kitchen does not fit the rules.
What ruins coffee beans
The National Coffee Association lists four enemies of roasted coffee in its storage guide: air, moisture, heat and light. Each one does its damage in a different way.
Air
Oxygen is the slow one, and the one you cannot avoid entirely, because every time you scoop out beans for a brew the bag lets in a fresh breath of it. It reacts with the oils and aroma compounds in roasted coffee and turns them flat and papery. Less air means slower staling. That is why pressing the air out before you fold the top over is worth the two seconds it takes.
Moisture
Roasted beans are dry and porous, and they soak up water from the air. Damp beans go stale faster and lose their aroma sooner. A humid kitchen, a bag left open beside the kettle, or cold beans sweating after they come out of the fridge will all do it.
Heat
Warmth speeds up every change that makes coffee stale. The spot above the coffee machine, the cupboard next to the oven, and the counter beside the dishwasher are all warmer than they feel. Pick the cupboard furthest from anything that heats up.
Light
The NCA warns that clear canisters let in light, which can harm the taste. Sunlight also warms whatever it falls on, so a glass jar on a sunny windowsill fails twice.
Keep them in the bag, folded over
Once the bag is open, squeeze out as much air as you can, fold or roll the top down tightly, and clip it. Then put it away in a cupboard, where it stays dark.
If you prefer a canister, choose one that is opaque and airtight, and small enough that the beans nearly fill it. A big canister with a handful of beans in the bottom is mostly air.
Why not the fridge
A fridge seems like the careful choice. For coffee beans it is the worst cupboard in the house, and it does three things to them:
- It is humid inside, and beans soak up that moisture.
- It smells of everything else in it, and porous beans take on those smells.
- Every time you take cold beans out, warm kitchen air meets them and water condenses on the surface.
The NCA notes the same problem with condensation. The cold does not make up for the damp.
When the freezer is worth it
The freezer works for one job: holding a sealed bag you will not open for months. The NCA's own chart gives roasted beans three to four months in the freezer, against one to three weeks at room temperature. If you have bags you will not get to for months, freeze them unopened.
When you want one, move it from the freezer to the counter and leave it sealed until it has warmed to room temperature, a few hours at least. Opening it cold lets moisture condense straight onto the beans. Once a bag has been opened, keep it out of the freezer. Each trip back and forth wets the beans again.
How long stored beans last
Stored this way, beans are at their best for about three weeks after roasting and stay good past that, which is why we suggest drinking a bag within a month of it arriving. A 12 oz bag makes about 14 pour overs, so one cup a day finishes it in two weeks. We go into the numbers in how long coffee beans stay fresh.
Common storage mistakes
- Grinding the whole bag at once to save time. Ground coffee is past its best within about an hour, as we explain in whole bean vs ground coffee.
- Leaving beans in the grinder's hopper for days. Many hoppers are clear and not airtight. Fill it with what you will use today.
- Tipping a new bag on top of the last few beans in a canister. The old beans get mixed in with the new ones. Finish the old beans first, or brew them separately.
- Keeping the bag on top of the coffee machine, where it warms up every morning.
- Buying a big bag to save money when you drink one cup a day. Most of the savings go stale before you reach them.