Can Nigori Sake Become Koshu (Aged Sake) if Stored in the Refrigerator?

I’ve heard that most types of sake can be enjoyed as koshu (aged sake) if stored in a dark place or a refrigerator for many years. Is it possible to enjoy nigori sake as koshu if it’s stored in the refrigerator?

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Let’s answer it right away.

Of course, you can enjoy nigori sake as koshu. However, for unpasteurized sake such as namazake or sparkling nigori sake, which are more prone to changes over time, aging at -5°C is ideal.

For pasteurized nigori sake, types that are clean and dry, ranging from Classic-Medium to Classic-Full, are more suited for aging at room temperature or in the refrigerator.

Please use it as a reference.