Should I store coffee in the freezer?

Storing coffee in the freezer is a controversial topic among enthusiasts, but the science is clear: cold temperatures slow down the chemical reactions that cause staling. If you have a large supply of coffee that you won't be able to consume within a few weeks, the freezer can be a valuable tool to preserve the beans' quality. However, it must be done with extreme caution.

The biggest danger to frozen coffee is moisture. Coffee beans are porous and act like a sponge, absorbing odors and humidity from their surroundings. If you place a bag of coffee in the freezer without ensuring it is perfectly sealed, the beans will absorb moisture from the air. When you take the bag out, that moisture will condense on the cold beans, leading to rapid degradation and potentially even mold growth. This is the primary cause of 'freezer burn' in coffee.

If you choose to freeze your coffee, use a vacuum-sealed bag or a high-quality, airtight container. It is also best to portion your coffee into smaller, single-use amounts before freezing. This prevents you from having to take the entire supply out of the freezer repeatedly, which exposes the beans to temperature fluctuations and condensation every time you open the container.

In practice, if you are buying coffee for daily use, the pantry is usually the best place. Keep your beans in a cool, dark, and dry location in an airtight container. Only reach for the freezer if you have a surplus of beans that you intend to store for more than a month. If you do freeze them, let the beans reach room temperature before opening the container to prevent condensation from forming on the cold surface of the beans.