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Storing in the Refrigerator. Scoop sauerkraut into jars or freezer bags. Close the jar or bag tightly so no air can enter. Label the jar or bag with the date. Sauerkraut can stay good for up to three months in the refrigerator. Dating the bag will help you remember its age. Place the jar or freezer bag filled with sauerkraut on a shelf in your refrigerator.
That being said, the minimum length, that I recommend, to ferment sauerkraut in your jar on top of the counter is one week. This gives it time to establish some beneficial bacteria, create lots of brine (which peaks around day four) and also prevents disturbing the nice anaerobic environment youâve established.