An unopened can of miso will not likely expire because the fermentation process will keep going.
However, at some point, the quality may gradually degrade. An opened miso may also unlikely expire if stored properly.
The more often you open the jar, the more prone it is for contamination and quality degradation. Eventually, you might need to throw it away.
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HOW LONG CAN MISO LAST
Miso can last long because it will keep on fermenting as long as the package is still sealed.
It does not even need chemical preservatives. Once you open it, miso will start degrading its quality and taste.
An unopened jar of miso can last about a year before starting to degrade. Most companies may put the “best before” label on the package to notify the estimated time when the miso would likely start degrading.
