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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.
Fermentation naturally stops when the sauerkraut reaches the proper acidity. Temperature affects the speed of fermentation. Between 60Â°F and 65Â°F, it will take 6 weeks to make sauerkraut. The ideal temperature is between 70Â°F and 75Â°F where it will ferment properly in 3 to 4 weeks.