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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.
It just needs to ferment longer. 4 week sauerkraut isnât fully fermented. It takes a minimum of 10 weeks to get a good sauerkraut. Some people donât touch it for a full 6 months. It shouldnât taste like cabbage and shouldnât taste salty. 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.