How Long Does Miso Soup Last? (safety guidelines)

Do you Know How Long Does Miso Soup Last? Miso soup has a short shelf life. It is recommended that miso should be consumed within two months of purchase.

If not, it should be discarded and replaced with fresh miso. For example, if you buy 5 cans of miso-flavored broth in October and serve them through the end of December, it would be safe to consume the last can in January since this would also meet the two-month limit for consumption.

How Long Does Miso Soup Last
How Long Does Miso Soup Last

Miso soup is a delicious, healthy, easy-to-make soup usually made with miso paste, dashi (a broth), and vegetables. It’s a famous soup in Japan and is often served at restaurants. But how long does miso soup last? And what are the best ways to store it? Keep reading to find out!

What is Miso Soup?

Miso soup is a Japanese soup made out of miso paste, seasoning from koji and rice, broth or water, and vegetables.

The miso paste can either be dark or light, depending on what is used to ferment it. The soup is usually served hot and garnished with green onions and ginger for a bit of taste and texture. It is perfect on a rainy day, especially when served with a big bowl of rice!

How to make miso soup for last long time?

The most important thing to remember when making miso soup is never to mix the broth and the miso paste until they are both ready to go.

Combining the two ingredients will cause many of their beneficial properties to be destroyed. This is because the miso paste enzymes will break down the sugars in the broth, which would turn them into temporary vinegar and acid.

So, how to make miso soup


  • Miso Paste
  • Flour
  • Water
  • Koji
  • Salt


1. Prepare the vegetables. Put enough water in a pot and put a lid on it to keep the broth from evaporating. Wash the vegetables thoroughly, place them in the pool, add salt and cook for 3 minutes. This will help remove excess moisture from the vegetables, so they do not become too soft when cooked. Drain and set aside.

2. Prepare your miso soup by adding the koji (prepared in step 1 above) and a small quantity of water or broth to the pot. Please bring it to a boil, and then turn off the heat. Add the miso paste slowly while stirring with a long spatula. Sprinkle some flour on top, start again, and you have your miso soup!

3. Add the cooked vegetables to the pot and serve.

As mentioned earlier, miso soup is best consumed within two months of purchase. If you do not use it all up during that time, you should freeze the leftovers in an air-tight container for later or discard them. Putting miso soup in a vacuum pack or wrapping it in plastic will cause it to go bad faster than if you left it out in the open.


Miso soup is easy to make and can be prepared using just a few ingredients. Use miso flakes (if you are using dark miso) and not powder because the latter will make the soup bitter and old tasting.

The easiest way to tell how long miso soup lasts is by looking at how well it absorbs liquid. If the soup is still thick after you add it to your rice bowl, it has been sitting for too long and should be discarded.

Remember that miso soup has many other beneficial properties besides its ability to last a long time. It can be a great muscle relaxer and can help you sleep better when you eat it before bed.

It is also great for your gut health because it contains Lactobacillus, which helps prevent the growth of harmful bacteria, especially the ones that cause inflammation. Lastly, it contains antioxidants and healthy fats that lower cholesterol levels.

The nutritional value of miso soup

Serving Size: 1 cup

Total Calories 110
Calories from Fat 7
Protein 3 grams
Carbohydrates 10 grams
Fiber 4.5 grams
How Long Does Miso Soup Last

If you are unsure whether the soup is good or bad, it’s best to use the liquid remaining in your pot and add a little more water or broth to make it the right consistency. Shake it up again before serving so that all ingredients mix well.

So, How Long Does Miso Soup Last?

Miso soup can last anywhere from 2 days to 3 months, but it is recommended to use it within 2 months of boiling. If the broth soaks up too much liquid, shake your soup again before serving since mixing the ingredients too soon will cause the benefits of the miso paste to be reduced.

The longevity of the soup depends on several factors. Some of the key ones include:

  • The quality of the miso paste used to make it.
  • How hungry you were when you served it and how often you ate it.
  • If your tap water has sulfur, you could have a problem since this can also increase how long miso soup lasts.
  • The ratio of water to miso paste used in the soup.
  • If you keep all of these things in mind, you should have no problem whatsoever when it comes to storing your miso soup.
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How to store miso soup?

Store your cooked miso soup in an airtight container and put them in the refrigerator. You can also keep them in a freezer so the temperature stays cool enough not to become too sour or go wrong. You can store up to six months of your frozen miso soup.

Shelf life of miso soup:

The actual shelf life of miso soup varies from one type to another. As mentioned earlier, the longer it is stored, the more it spoils. The one that has the most extended shelf life is the light miso soup because it contains more water compared to the dark miso soup.

On the other hand, many companies do not include an expiration date on their package of miso paste because it depends on how well you use it.

Miso soup can last from 2 days to 3 months. It all depends on how you store it and how well you prepare it. Make sure you stir your soup or shake it before serving to mix all ingredients evenly.

Storing Tips for Miso Soup:

The best way to store miso soup is in an airtight container and place it in the refrigerator. Avoid exposing it to sunlight or freezing it, as this can degrade its quality.

Some tips for miso soup storage:

1. Fill a bowl with cold water and ice cubes. Place your miso soup in it and leave it in the freezer for about an hour. Take it out and let it sit on the counter for about five minutes. You can now reheat the soup in its container over a low flame or microwave it long enough to ensure the temperature is right.

2. If miso soup remains in your pot after a meal, you can freeze it later. Shallow freezing is best for this task. All you have to do is put some ice cubes in the pot and put them on the counter. The soup will thaw by itself when you need to reheat it.

3. Make sure you allow your miso soup to cool before covering it or putting it back in the refrigerator or freezer. Otherwise, bacteria can grow in it.

4. Since miso is a fermented food and can grow mold if the temperature is too warm, you may wish to place miso soup in an airtight container and store it in your refrigerator. This will keep the temperature steady and prevent mold from forming.

5. More and more miso paste is being bottled so you can take it with you when traveling. However, it is always best to hand-make your own because it has a much better flavor and does not go wrong as quickly as store-bought miso paste.

How Can I Tell If Miso Soup Is Bad?

The best way to tell if miso soup has gone wrong is by looking at its color. If it’s not light yellow anymore but dark yellow or brown, it has probably expired for some time now.

You also need to check if there are any foreign objects or foam in the soup because these can also be signs that the miso soup has probably gone bad.

Another way you can tell your miso soup’s quality is by the smell. There are two types of miso soup that you can make out of it:

  1. Miso soup is made from dashi, which is traditional miso soup. This will have a light, clean and fishy scent to it. If you notice that your miso has an unpleasant odor, then this means that it has gone bad, and you should discard it since this is one of the signs that it is no longer suitable for consumption.
  2. The other type is the “salty miso soup” or “salty miso paste soup.” This type has a much stronger salty scent, which can only be redeemed if you use good miso paste.

It would be best to be careful when using this miso soup so it doesn’t go bad. If you notice any unusual smell or signs that it is leaking water or fishy liquid, throw it out immediately and make a new batch right away.

Can You Freeze Miso Soup?

You can freeze miso soup, and it is a good idea. You will find that it helps make your soup taste better. The biggest challenge you will have is ensuring the soup doesn’t get freezer burn. This will cause the soup to spoil and taste bitter. Your best bet is to ensure that you follow proper storage as given above.

If you want to freeze a portion of your soup for later, you must ensure it is completely cool before sealing it. Allowing it to sit out for several hours makes the best option because it won’t freeze as quickly. You can also put some ice cubes in the container, so the soup stays cool until you are ready to enjoy it.

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How long does soup last in the fridge?

The method that you use to freeze miso soup will largely depend on the product that you are using. The type of miso paste that you have will impact your method.

  • If you are using a light miso paste, you can either place it in an airtight container and place it immediately in the freezer or pour it directly into a freezer bag, close the bag and freeze it overnight.
  • For the “salty miso paste” you get from a Japanese market, you can put it in a freezer bag after cooking it for about an hour. You can also place it directly in the freezer if you do not have an airtight container.
  • You will need to split your soup and store each portion separately for the mixed misos soup. You will need a container or bag to store each portion and then place them separately in the freezer, so they do not get mixed up with others or freeze together.
  • You can freeze miso soup longer if you store it in your refrigerator. The longer you keep it, the better the taste will be when you have it later on.

If your miso soup does not taste as delicious as it should be, then the only thing to blame is yourself. It is disappointing to have a bowl of cold soup that tastes like it has gone bad.

If you want to avoid this risk, then make sure that you store your miso soup properly, shake or stir it before serving and make sure that you only use the freshest ingredients for your dish.

Can you eat miso soup cold?

It is believed that miso soup can be consumed cold, but it is not the same kind of miso soup that can be bought in the market. You can refer to the instructions above if you make your miso soup.

Usually, these kits are more expensive than the stuff you can get from the store, and for a good reason. These kits use much fresher ingredients and have been crafted precisely to ensure you will have a good experience when consuming them.

The kits you will get from Japanese stores are cheaper and less effective in preparing your food. The taste is also not as good. If you want to enjoy this kind of food, make sure that you buy genuine stuff and keep it as fresh as possible to have a good experience.

If you hope to enjoy miso soup cold, it is best to freeze it before consuming it.

How Can I Make Miso Soup Last Longer?

There are a lot of ways that you can extend the shelf life of your miso soup. Some of them are discussed below:

1. If you have the traditional miso soup, the fishy smell or change in color is good because it has gone bad and needs to be thrown out. You should use the dashi (water) recipe as soon as possible and make sure your miso soup does not go bad before making it.

2. If you have salty miso paste soup and notice a strange or leaking smell, throw it out immediately. It is the same with appearance and color if they are not what they seem.

3. Do not keep your miso soup in direct sunlight or in an area where it can be easily exposed to heat or moisture. The temperature should always remain cool because this can breed bacteria, which will cause the miso soup to go bad faster.

4. Do not use your miso soup if it has become cloudy or thick. If you ever notice any unusual smell, change in color, or leaks, throw it out immediately.

5. If you have an electric stove and the temperature has gone up to high so that your pot gets too hot, pour hot water into the pool to bring down the temperature before adding the miso sauce or soup.

6. Place your miso soup in the refrigerator when you are not using it. This will extend the shelf life by ensuring it does not get too hot.

7. If you have a pure water pot, use water instead of dashi (fish soup stock). This will ensure that the miso soup does not become contaminated with flavors from other foods or substances, such as metals, which can be toxic, like lead or iron.

8. If you store your miso soup in an airtight container, ensure it is covered. This will help prevent the dish from becoming smelly or leaking too much.

9. Make sure you have enough miso soup for your whole family at any time. This will ensure that everyone gets to enjoy an entire bowl of dashi (miso soup) every time they eat dinner, and this can help minimize waste and extend the dish’s shelf life.

10. If you make your miso soup in advance, you should use a smaller amount of dashi (fish soup stock) so that it does not go bad before serving it.

Bottom Line

Miso soup is a traditional Japanese dish that helps to increase your appetite and also provides several other health benefits. Miso soup can be made in different ways and enjoyed hot or cold. However, if you want to enjoy it cold, ensure you have frozen it first.

You can also make your miso soup last longer by storing it properly and not exposing it to heat or moisture too much. This will help ensure that your miso soup will always be fresh for consumption whenever you want to serve it.

I Hope That This Tutorial Helped! If you have any Questions or Comments, please leave a comment below. Also, if you make any of your Miso soup and would like to share it with me, please do so by sharing the recipes on my Facebook page. Thank You!

About Shayon Mondal

My name is Shayon Mondal, and I am the proud owner of Foodsvision, a vibrant and delicious food blog. At Foodsvision, we believe in the power of food to bring people together and create memorable experiences. Join us on this culinary journey as we explore diverse flavors, share mouthwatering recipes, and celebrate the joy of cooking. Get ready to tantalize your taste buds and embark on a delightful adventure with Foodsvision! And more info page

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