Can miso soup go bad? How long until it expires?

by Joost Nusselder | Updated:  November 15, 2020

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Miso soup is a common side dish in most Japanese cuisines. Famous for its umami flavors, many home cooks have since learned to make their own miso soups to use as broths or to serve as a side dish.

In fact, did you know that instead of cooking them in small batches, many chefs have opted to make them in large batches to store?

But you may also wonder at this point – can miso soup go bad?

Can miso soup go bad

We’ve already written about if miso paste can expire, but in this article, I want to focus on the soup itself.

In short, miso soup doesn’t go bad as quickly as you think. When stored in an airtight container and left in the fridge, miso soups are generally safe to consume for the next 3 days. Of course, you’ll have to reheat it before drinking or to use it as a soup base, and it’s always best if there are no condiments like seaweed or tofu in your soup.

Can you freeze miso soup?

If you’re looking to store miso soup for an even longer period, you could always place them in a freezer-safe bag or airtight container to freeze them for up to 6 months.

Miso soups are also good when portioned into ice cube trays, so you wouldn’t have to thaw the entire batch of soup when you want to use it.

Also read: this is how you freeze miso soup as well as miso paste

So, how can you tell when your miso soup has gone bad? Because miso soups have a natural umami flavor, it can be hard to tell when your soup has gone bad.

As a rule of thumb, you should throw out any refrigerated miso soup after 3 days – regardless if it has condiments or not.

Separately, it would also be good to date any frozen miso soups, so you’ll know how long it has been kept in your freezer.

It’s not recommended to use any miso soups that have been frozen for over 6 months, or if it’s visibly discolored upon thawing.

When your miso soup looks more cloudy than usual or has mold on them, those would also be clear signs that it’s time to throw it out.

Finally, miso soups that have been left out overnight without being kept in the refrigerator should never be consumed as it’s difficult to tell if it has gone bad.

This is especially true for any miso soups that may have added condiments like tofu and seaweed or other seafood products.

Miso soups that have gone bad would also emit an unpleasant fishy smell, and that’s when you know it’s not safe for consumption anymore.

Also read: this is how you make a nice miso soup breakfast

Joost Nusselder, the founder of Bite My Bun is a content marketer, dad and loves trying out new food with Japanese food at the heart of his passion, and together with his team he's been creating in-depth blog articles since 2016 to help loyal readers with recipes and cooking tips.