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Storing in the Refrigerator. 1  Scoop sauerkraut into jars or freezer bags. Close the jar or bag tightly so no air can enter. 2  Label the jar or bag with the date. Sauerkraut can stay good for up to three months in the refrigerator. 3  Place the jar or freezer bag filled with sauerkraut on a shelf in your refrigerator.
If itâs in a cool place, it will take longer to ferment. Personally, I think 4 week sauerkraut is too young though many people eat it that early. If it still tastes cabbagey, itâs not ready. I usually let mine ferment at room time (72F) for about a week and then move it to a cooler place to ferment for a full 12 weeks. started fermenting my sauerkraut in a fido jar about 3 weeks ago. I noticed a few days after it started fermenting, it had risen over the brine. I didnât know at the time that I should open it and add more brine so it has been sitting there over the brine for 3 weeks.