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In the fridge
Flaxseed, once ground, can quickly go rancid without its husk keeping it fresh. This is why it's best to mill your own flaxseed. If you'd still like to use pre-milled flaxseed, it needs to be kept in an airtight sealed container in the fridge or freezer. If not refrigerated, they can go rancid, and if the container is not airtight, they will become oxidized. They can be stored in this way for up to six months. Also try to buy ground flaxseed that is vacuum-sealed, to ensure that it has not oxidized before you even get to bring it home.
