Store roasted garlic in the refrigerator for up to two weeks in a jar or airtight container. If you plan to store it beyond that time frame, I recommend you freeze it until you plan to use it. If you have a lot of roasted garlic, use an ice cube tray to freeze the roasted garlic in smaller quantities. Once the cubes are frozen you can transfer them to a bag or container. Then when you need a tablespoon or two, simply remove the amount of cubes you need from the freezer.