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How Long Does Peanut Oil Last? Does it Go Bad?

These days peanut oil is widely used because of its nutritional benefits.

But while storing this, people think that until when they can use it or do peanut oil go bad?

Just like other oils, this also gets bad if you keep the oil stored for an extended period.

Many people consider the labeled date on the pack as the oil’s shelf life, but that is not true.

The labeled date on the pack tells which time it can retain its original quality.

However, the oil will be fine to eat even after this period, but one needs to compromise their taste.

What is Peanut Oil?

This vegetable oil is also known as Arachis and groundnut oil.

It is made from the seeds of a peanut plant which develops underground.

More often, peanuts are considered in the category of almonds and walnuts, but actually, they are a kind of legume that falls in the category of beans and peas.

The oil includes different flavors ranging from mild and sweet to strong and nutty.

This also includes different refining techniques such as cold pressed, gourmet, refined, and blended peanut oil.

These are most commonly used in places such as Chinese and South Asian cooking styles.

The nutritional value of peanuts is incredible, as only one tablespoon can offer you vitamins, fats, calories, and much more.

These are rich in providing monounsaturated and polyunsaturated fat.

This also includes linoleic acid, which is an omega-6 fatty acid.

How Long Does Peanut Oil Last? Does Peanut Oil Go Bad?

As we discussed above, peanut oil comes with a best-by date which is the date after which the deterioration process begins, but the oil’s shelf life oil is different.

The printed date only specifies that the oil will lose its potency.

This is an indication that you need to finish the oil, as it will go bad within a short time span.

Oil’s shelf life when its pack is unopened is two years after the labeled date.

Usually, these packs can last longer if you keep them closed as they do not get exposed to any outer element.

However, once you open the oil pack, you cannot expect such long shelf life as it will only last for a year.

If the pack is used and you have stored it for further use, it will hardly be good for two weeks.

That is because once the oil is taken out for use, the process of oxidation begins.

Due to this, the oil gets bacteria and goes bad in no time.

People who occasionally use peanut oil must not buy them in bulk as after opening, it will not serve you for long, and the quality will become lower.

How to Tell if Peanut Oil Has Gone Bad?

  • Difference in Appearance.

When you are not sure about the time of storing the oil, you must check if it is good or bad, as bad peanut oil can be harmful to your health.

For that, you can look for signs such as appearance.

You need to examine the oil closely and see if there are any impurities.

That is because it develops a crystallization that might be floating on its surface when it gets bad.

  • Change in Color.

When the oil becomes bad, it tends to change its color to a darker shade.

Thus you can compare the current shade of oil to the initial one.

The color change is a sign of contamination; therefore, if you see this, then be ready as you need to throw it out.

  • Unpleasant Smell.

If there are no impurities or change in color, then you can try to smell the oil.

At the initial stage, the oil has a nutty smell that is entirely pleasant, but if the oil is no better, then the smell will become unpleasant and foul.

If you are getting a foul odor, then that means your oil has gone bad, and you must discard it.

How to Store Peanut Oil?

  • Keep the Container Closed.

If you have used the oil once, you must keep the lid closed and sealed to preserve its quality.

If you keep the lid open, the old one will degrade in quality and will not offer you a similar texture after that.

Thus, it will be better if you use an airtight container to preserve it from air and moisture.

  • Store in a Cool and Dark Place.

You do not have to store the oil in the refrigerator as it can also be preserved at room temperature.

However, while storing them, you must be careful to keep them in a cool and dark place.

Outer elements like direct sunlight and heat can break its compounds, which will go bad.

  • Store Separately.

When people use the oil, they mix the leftover oil with the fresh one.

This can reduce the freshness of your oil a lot; also, this will transfer the impurities of used oil to the new container.

Therefore be careful while storing them and use a separate container to increase their storage life.


If you use bad peanut oil, then fortunately, that will not harm your body severely, but it can surely ruin the taste of your dish.

Thus, it is crucial to check the oil’s freshness before using them.

People with sensitive stomachs can face difficulties like nausea, bloating, and abdominal cramps; therefore, it will be best to avoid them.

It is advised to have peanut oil before it loses its quality and taste.

How Long Does Peanut Oil Last? Does it Go Bad?

Wondering if your peanut oil is still safe to use? Find out how long peanut oil lasts and whether it can go bad.
5 from 1 vote
Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes
Course Shelf Life
Servings 1 Serving


  • Peanut oil
  • 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 Peanut Oil Last
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