Last updated: June 10, 2026.
Kimchi can go bad, even though it is fermented. It may become more sour, fizzy, and soft as it continues to ferment in the refrigerator, but discard it if you see mold, smell a rotten or putrid odor, notice unusual slime, have a leaking or unsafe package, or cannot trust the storage history.
Normal Fermentation vs Spoilage
| Sign | Usually normal | Throw it away |
|---|---|---|
| Sour smell | Tangy, acidic, fermented | Rotten, putrid, or garbage-like |
| Bubbles | Some fizz from fermentation | Explosive pressure, leaking, or unsafe package |
| Texture | Softer vegetables over time | Unusual slime, mush, or mold growth |
| Color | Some darkening from age and seasoning | Fuzzy mold or unusual colored growth |
| Taste | More sour than when new | Do not taste-test if smell, mold, or storage is concerning |
How To Store Kimchi
- Follow the package label for refrigeration and use-by guidance.
- Keep opened kimchi refrigerated at 40 degrees F or below unless the label says otherwise.
- Use a clean utensil each time so you do not introduce crumbs or saliva.
- Keep vegetables pushed below the brine when possible.
- Do not leave opened kimchi at room temperature for long periods.
When To Be Extra Careful
People who are pregnant, older adults, young children, and anyone with a weakened immune system should be more cautious with fermented or ready-to-eat refrigerated foods. If the kimchi is homemade, improperly fermented, moldy, or stored unrefrigerated, discard it rather than trying to rescue it.
FAQ
Is fizzy kimchi bad?
Not always. Some fizz can be normal fermentation, especially in fresh or active kimchi. Discard it if the jar is leaking, smells rotten, shows mold, or storage was unsafe.
Can you eat kimchi past the best-by date?
Only if the label, storage history, smell, appearance, and texture are still acceptable. A date is not a guarantee of safety after poor handling.
Should kimchi be refrigerated?
Most opened retail kimchi should be refrigerated unless the label gives different instructions. Refrigeration slows fermentation and helps preserve quality.
Can you scrape mold off kimchi?
No. If kimchi has visible mold or unusual growth, discard the batch. Do not scrape off the top and keep eating from the jar.