How long does miso paste last?
So, you’ve bought a few packages of miso to make miso soup or use in ramen noodles. You tried a few recipes, but for some reason dishes with miso didn’t get into your standard menu.
Now you’re left with a jar that’s nearing its date. That begs the question: how long does miso paste last?
Or maybe you’ve just opened a package of miso and aren’t sure how to store it for the long term. You’ve checked a couple of websites and found some conflicting information. Some say that miso can sit at room temperature, while others urge you to refrigerate it. And you’re not quite sure who to trust. Same thing with the shelf life and going bad of the paste.
If you would like to learn more about storage, shelf life, and going bad of miso, read on. In this article, I not only cover the basics but also share some links to producers’ websites where you can read about miso in more detail.
What is Miso Anyway?

Miso is made by fermenting soybeans with salt and a traditional Japanese ingredient called ‘koji’.
Koji is made by boiling rice, soybeans, or barley inoculated with Aspergillus Oryaze, which is a fermentation culture.
Consuming fermented eatables will always taste foreign to your taste buds at first and therefore, eating miso on its own will provide a shock to your taste buds as it is tangy and extremely salty.
It has a paste-like texture and they are mainly used for making soups. To be clear, miso is a flavor boost that introduces your palate to a unique burst of tang and taste! More recipes with miso can be found here.
However, because of the unique taste of miso, it is also often added as a salad dressing or used as marinades.
Some people also add a little bit of miso in their vegetable dishes and baked tofu.

Miso is a go-to food product for vegans and vegetarians. But the prospects of using miso are not limited as it is also often used in a lot of traditional Japanese dishes.
There are also obviously different types of miso pastes and it depends on the type of ingredients that were used.
But, if you are out in the market looking to buy one, you will be able to make out the different types of miso by the variety of colors.
How Long Does Miso Last?

If there’s a best-by date on the label, you can easily assume that unopened miso will be at peak quality for at least a couple of months past that date. If there’s only the production date, the paste should keep its quality for at least a year.
Past that time frame, the paste won’t go bad or anything, but it might degrade a bit in terms of quality and become less sweet to taste. That’s because miso is alive, and it continues to ferment, albeit very slowly.
Once you open the package, the degradation process accelerates a bit. Generally, the paste should retain the best quality for about 3 months after opening the package.
That, of course, doesn’t mean that it will go bad after 4 months or half a year. But at a certain point, you might notice some subtle differences in flavor between the paste you have and fresh miso. However, if the quality of the paste is good enough to use, you can continue using it.
Pantry Fridge Miso (unopened) 1 year or best by + 3 – 6 months Miso (opened) 3+ months
Please note that the periods above are for best quality only. Properly stored miso will last much longer with pretty good quality.
How To Tell If Miso Is Bad?

As I mentioned earlier, miso can last a long time, so the chance that it will spoil is slim to none. However, with time the quality of paste degrades slightly, and at some point, you might decide to throw it out for quality purposes.
Give it a good sniff and decide if it’s good enough or not. If you’re unsure, you can eat a small amount before you make the final decision.
How To Store Miso
In terms of storage, miso is quite similar to Tabasco. You should store an unopened package of miso in a cool and dark place, away from light and sources of heat. The pantry is the best place, but a cabinet in the kitchen will get the job done too. Just make sure it’s not near the stove, as the temperature fluctuations may alter the taste of the paste. There is no need to refrigerate unopened miso.
Once you open the package, make sure it’s always sealed tightly when not in use.
When it comes to where opened miso should be stored, there are two options. The fridge is the best place because miso retains quality best at low temperatures. However, the pantry or even room temperature in many cases is a-okay for prolonged storage as well. If the label doesn’t urge you to refrigerate the paste after opening, feel free to keep it in the pantry.
Last but not least, always use clean utensils when scooping the paste for miso soup (e.g., with tofu) or ramen noodles, or any other dish that requires it.
While fermented soybeans and salt don’t make a great environment for foreign bacteria to live in, microbial contamination is still a possibility. And it’s super easy to avoid it by simply always using clean spoons.
Miso is a fermented soybean paste used in Japanese cuisine.
Miso has been around since ancient times but its popularity has grown exponentially in recent years.
Miso is high in protein and contains probiotics, making it a healthy addition to your diet.
However, there are several misconceptions surrounding miso.
This blog post will clear those up!
Refrigeration:
Miso paste is a fermented soybean product used in Japanese cuisine. It is usually sold in plastic containers with a screw cap. Miso paste is a salty condiment that adds flavor to soups, stews, salads, and other dishes. It is available in different colors, such as red, white, yellow, green, and black. Misos are typically stored in the refrigerator because they contain salt. However, miso paste can be stored longer if refrigerated properly. Refrigerating miso paste helps prevent mold growth. To store miso paste, remove it from the package and place it into a glass jar. Cover the jar tightly with a lid. Store the jar in the refrigerator. Keep the miso paste away from light and moisture. The shelf life of miso paste depends on how old the miso was when purchased. For example, miso paste that is two years old or older will likely not taste good.
Nutritional benefits of miso:
Miso is a fermented soybean paste that contains protein, carbohydrates, vitamins, minerals, and amino acids. It is rich in B vitamins, especially thiamine B1, riboflavin B2, niacin B3, pantothenic acid B5, folic acid B9, biotin B7, vitamin C, iron, zinc, calcium, phosphorus, magnesium, potassium, copper, manganese, selenium, iodine, and molybdenum. Miso is a great source of protein. One tablespoon of miso contains about 10 grams of protein. This is equivalent to 1/4 cup of cooked beans. Miso is also a good source of fiber. A serving of miso provides 2 grams of dietary fiber. Fiber helps lower cholesterol levels and prevents constipation.
Shelf life of miso:
MISO is a traditional Japanese condiment that is used in soups, sauces, dressings, and marinades. Miso is made from soybeans that have been inoculated with a special mold called koji. After fermentation, the mixture is aged for several months. During this process, the soybeans lose moisture, resulting in a thick, creamy consistency. Miso comes in two varieties: red and white. Red miso is darker in color and stronger in flavor than white miso. White miso is milder and sweeter than red miso. Both types of miso are available in jars or cans.
Proper packaging:
Miso is a fermented product and therefore needs to be stored properly. It should be refrigerated after opening and should not be left open for long periods of time. Once opened, miso should be consumed within 6 months.
How to identify bad miso?
If the miso looks moldy, smells bad or tastes bitter, it is probably bad.
White miso paste vs Red miso paste:
Miso is a fermented soybean product used in Japanese cuisine. It is usually sold in blocks or jars, but sometimes comes in powder form. Miso is typically salty and thick, with a flavor similar to anchovies. There are two main types of miso: white miso shiro and red miso aka shoyu. White miso is milder and sweeter while red miso is stronger and saltier. Both types of miso are made from soybeans, but the process of making each type varies slightly. White miso is made by fermenting soybeans with koji, a fungus that grows naturally on soybeans. This produces a light, sweet, salty paste. White miso is available in many different varieties, such as shiromiso, shinshu, shirokoji, and shirodaira.
How to store miso:
Store miso in a cool, dark place away from direct sunlight. Miso tends to lose its flavor after about six months if stored improperly. To extend the shelf life of miso, wrap it tightly in plastic wrap and refrigerate. Red miso is made by soaking soybeans in brine saltwater for several days until the beans start to break down. After that, the beans are ground into a fine paste. Red miso is darker and thicker than white miso. It is traditionally used in soups and stews, but it can also be used as a seasoning. How to store red miso: Answer : Store red miso in a cool dry place away from direct sunlight for up to 6 months.
Storage conditions:
To extend the shelf life of red miso, wrap it in plastic wrap and refrigerated.
How long does miso paste last?
Miso paste is stored in a cool place, away from direct sunlight. It can be stored in a refrigerator for about 6 months. What is the difference between white and yellow miso?
What can I do with leftover miso?
Refrigeration is not necessary if you buy miso from a reputable store. However, it is recommended that you store miso in the refrigerator because it will last longer. What is the difference between white and red miso? White miso is milder and sweeter than red miso. Red miso is stronger and saltier.
Can you freeze opened miso paste?
Yes, you can eat miso paste raw. Miso is fermented soybean paste. It contains enzymes that help break down protein and carbohydrates. This helps to improve digestion and absorption of nutrients. Miso is used in Japanese cuisine. In Japan, miso soup is eaten everyday after lunch. Miso is also used in many other Asian cuisines such as Chinese, Korean, Thai, Vietnamese, Indonesian, Malaysian, Filipino, Indian, Sri Lankan, Nepalese, Bangladeshi, Pakistani, and Ethiopian.
How can you tell if miso is bad?
You can use it in soups, sauces, stews, stir-fries, salads, sandwiches, and even desserts. It’s great in sushi rolls, and it’s delicious in ramen noodles!
Can you eat miso paste raw?
If you are using miso paste, you can keep it for about 6 months. But if you are using miso soup, you should discard after 3 months.
How do you store miso paste?
Miso is usually sold in glass jars. It is important to check the expiration date on the jar. Miso that is past its expiration date should be discarded. When you open a new jar of miso, it should smell sweet and salty. If it smells sour or bitter, it is no longer good. You should always store miso in a cool place. Refrigeration will spoil miso quickly.
Should miso paste be refrigerated?
Yes, you can freeze opened miso paste. However, we recommend freezing only unopened miso paste. Once opened, miso paste loses its nutritional value and becomes useless. To freeze opened miso paste, simply transfer it into a freezer bag and freeze it. Make sure to label the bag clearly with the date and contents. If you are planning to thaw frozen miso paste, you can either put it directly into warm water or warm it in a microwave oven. Do not let it sit in hot water because this could destroy the nutrients in the miso paste.
How long can you keep miso marinade?
Miso paste is a fermented soybean product used in Japanese cuisine. It is available in various forms such as white, red, yellow, green, light brown, dark brown, and black. Miso paste is usually stored in glass jars. To prevent contamination from other ingredients, it is recommended to store miso paste in a cool dry place away from direct sunlight.