Kimchi has a long shelf life due to the fermentation process. When properly stored, it can last for several months in the refrigerator. The flavor and texture of kimchi may change over time, becoming more sour and softer as it continues to ferment. It's important to keep the kimchi tightly sealed to prevent exposure to air, which can speed up the fermentation process. If you prefer a milder taste, consuming kimchi within the first few weeks as the taste gets stronger and spicier the longer it sits.