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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.
So, you want to leave your sauerkraut out a minimum of four weeks to give time for your sauerkraut to go through all three bacteria stages. You can view the difference in the maturity and density of the LABs when you view the photos of the sauerkraut brine on Day 3 and Day 7 and then on Day 28.