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How Long Does Miso Paste Last? Does it Go Bad?

Miso paste is mainly a paste of Japanese condiments that increases the deliciousness of soups, sauces, and much more.

There is requirement for a small amount of miso paste in various dishes to make them tastier.

As usage is minimal, get detail on do miso paste goes bad before using it.

Based on the method you will opt for storing miso paste, its life will be decided.

At a time when you find that ingredient is not suitable for further use, throw it away.

With time ingredient turns out to be dark, which makes it an unfit choice.

What is Miso Paste?

Miso paste is mainly paste of fermented soybean widely used in various dishes that the Japanese add to their diet.

This item uses fermented soya beans, salt, and koji fungus.

Thousands of miso paste varieties are available, but two are widely used, red and white.

Koji is a crucial ingredient in miso soup that Japanese people eat daily.

One who wishes to use it can get options from the market or online stores.

It is mainly used as a seasoning on various dishes.

It is used as an ingredient in dips, dressing, and soups.

It has a very strong flavor that will surely make food items salty.

The spoil of miso paste is normally seen when the paste turns out to be darker than its normal color.

With the color change, even the taste of ingredient changes.

How Long Does Miso Paste Last? Does Miso Paste Go Bad?

People consider miso paste a good option till date available as a label on its bottles.

But in case the bottle remains unopened till date, and then you can use it for a couple of months, even after the date.

After you open it, the paste will remain in good condition for three months.

If a pack of miso is not opened, you can use it for one year, and the best period for use is approximately 3 to 6 months.

Freezing can be used to store miso for a good time.

To have a long hour use of paste, keep it at a temperature that is above 25F and -5C.

for freezing them; you can either use freezer bags or keep them in ice cube trays.

One thing that needs to be clear regarding miso paste is that it is not perishable but a preservative food.

It is an option that will not turns foul shortly, but it will fade in flavor and quality as time passes.

Contamination is the main reason that will finally lead to bad miso.

You can avoid bacteria attacks by using clean spoons to remove the paste from the pack.

How to Tell if Miso Paste Has Gone Bad?

  • Change In Color

One of the main factors that tell that miso paste has gone bad is a change in its color.

Generally, due to a temperature change, there is an alteration in the paste’s color.

If it turns out to be dark, then a high chance is there that its quality is lost.

Even storing miso paste in a warm place will lead to a change in color and flavor.

  • Mold Growth

If there is a growth of molds or bacteria on miso paste, then it indicates that paste is no more a good option to use.

Starting of molds takes place from spores and spreads on fruits and vegetables.

Generally, growth takes place on a fresh surface.

There are high chances of such growth in hidden areas like the bottom of the container.

  • Bad Taste

Generally, spoiled food items have a sour taste.

The taste will start to deteriorate with a high amount of humus in the paste, making it difficult for a person to have it.

An advisable option is to throw the paste away as the taste of the food item changes.

  • Change In Texture

If food items turn out to be crusty or have separation, it will indicate that the item is best to throw in the dustbin.

If food turns out slimy, it is a major indication of bad miso paste.

How to Store Miso Paste?

  • Unopened Package

Storage of miso paste will vary based on whether a package is open or unopened.

If a package is unopened, store them in a dry place and not in contact with sunlight.

You can keep the paste in the kitchen or pantry as per the availability.

Avoid keeping it near the stove, as temperature variations might affect its taste.

There is no requirement to use a refrigerator to keep unopened packages stored.

  • Opened Package

Once the package of miso paste is opened, seal it properly to avoid any damage in the future.

An opened package can be stored in two ways: keep them in refrigerators as the low temperature will help to maintain life and quality of the paste.

You can keep the package in the pantry at room temperature for long storage.

While adding paste to food, ensure you use clean and hygienic utensils to avoid any issues.


Miso paste is an ingredient that lasts for years if kept in an unopened form.

Adding this to various food items will surely increase their taste.

It is an option that Japanese people mostly use as it is their favorite dish.

It contains soybean, rice, and salts.

The use of salt in a dish will reduce the growth of fungi over time.

Storing miso paste in the fridge will help to reduce bacteria growth.

Just ensure you cover the paste properly and keep it in a refrigerator or an area that does not come in contact with sunlight.

How Long Does Miso Paste Last? Does it Go Bad?

Interested in how long your miso paste lasts? Find out the duration miso paste remains usable and if it degrades over time.
5 from 1 vote
Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes
Course Shelf Life
Servings 1 Serving


  • Miso paste
  • Air-tight containers or Ziplock bags
  • Labels and markers


  • Store your product in an labelled container in a cool, dark place like the pantry or fridge.
  • If your food is frozen, allow it to thaw in the fridge before cooking.
  • Make sure to look for signs that your food has gone bad before eating it.
Keyword How Long Does Miso Paste Last
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