Yes, your gravy can be made up to 3 days ahead of time and stored in the refrigerator. You can also freeze gravy for up to three months in a tightly sealed, freezer-safe container. When freezing any liquid, be sure to leave at least an inch of space at the top. Liquids will expand in the freezer, so you'll want to give it a little extra space when filling your container. If frozen, transfer your gravy from the freezer to the refrigerator the night beforehand to thaw.