How Long Do Pistachios Last in Different Conditions?

If you want to use pistachios, you need to know the most exact answer to the question, “How long do pistachios last?”.

You may hear different answers from many people, but let us tell you the most comprehensive yet detailed knowledge about this topic.

In this article, we will discuss many problems, pistachio nuts shelf life, how to know that this time is expired and how to prolong it to avoid wasting this great food!

How Long Do Pistachios Last in Different Conditions?

How long do pistachios last in different conditions

Like most foods, the lower the temperature is, the more slowly pistachios go bad. Because the high temp will allow biochemical reactions to happen more quickly and facilitate bacteria to thrive, storing them in a fridge or a freezer will help to keep them last longer.

Processed pistachios that have less fat content, be sealed in an airtight bag, or treated with preservatives will be able to last much longer than raw ones since they are more slowly oxidized.

So what are practically the specific cases? Let’s learn about them now!

1. Unshelled Type

Typically, unshelled pistachios can only last for not more than six months in the average room temperature (approx 25 degrees Celsius), so eat them as soon as possible if you want to serve them freshly.

In the fridge, unshelled pistachios are still usable for up to one year with correct storage.

Likewise, in the freezer, it is still safe for people to eat that have been placed in the freezer for up to 12 months.

2. Shelled Type

Commonly, shelled one can last for five months when properly stored in your pantry.

However, they can be stored in the fridge for as long as twelve months and are best served during the first 24 months inside a freezer.

After 12 months of being frozen, the nutrition quality of pistachios may start to decrease gradually.

3. Roasted Type

For both shelled and unshelled types, roasted ones can last in a shorter period about 50% longer since they have less fat content and become oxidized more slowly. So, How long is this period of time? I think it is no more than 6 months.

4. Out of Expiration Date

Everything will have its own shelf life, you need to understand two other sub-issues “how long do pistachios last after opening” (once opened) and “how long do they last if still sealed”.

If you have opened the package before it expires yet store it properly, you can still try to eat the rest within one week after the expiration date. Nonetheless, if a store-bought bag has never been opened and has always been stored in a freezer, you can still use it after one year of expiration date!

As you can see, in general, shelling pistachios and sealing them in airtight containers are recommended if you want to keep them longer.

What Are The Signs of Spoiled Pistachios?

What are the signs of spoiled pistachios

Like almost any other nuts, you can tell that a pistachio nut has gone bad when you see one of the following signs:

Sign No. 1:  You find weird taste such as bitter, sour pistachio, or rancid pistachios.

Ordinarily, rancid nuts emit a foul smell that we can compare with the uncomfortable odor of a plastic container that has not been used for a long time or paint.

So if you doubt that the pistachios have gone bad, carefully check whether they smell harsh or not by taking a sniff.

Besides, you can touch them to see if the nutmeat is dehydrated and becomes extremely dry. These are common signs of rancid.

(Remember that any nuts like cashews or pistachios consist of unsaturated fats and the lipids will become rancid if exposed to the heat for a long time.)

Sign No. 2: You find insects like bugs inside.

These tiny creatures often look dark, brown, green, or black and should continuously run over the surfaces of spoiled nuts.

Sign No. 3: There is mold on pistachios.

Pistachios mold may be green, dark, and white in color. It often appears as a powdery coat on its exterior.

Sign No. 4: Rotten pistachios usually smell bad, and the green color may look darker than normal. 

Generally, anybody can easily find a weird dark brown color that will gradually spread through all over the nuts.

Should you find only one of the above signs, throw your pistachios away because they have become unusable.

Trying to consume them will definitely make you sick.


1. What Happens If  You Eat Bad Pistachios?

Pistachios go bad might bring about severe stomaches or other health problems if you ingest them. Some other side effects include dizziness and even food poisoning.

Therefore, you should double-check the food whether it is out of its shelf life or not before deciding whether it is safe for you to eat or not. I strongly recommend that you only eat any food with the best by date on the label.

Make the most out of the signs of spoiled pistachios that we have just mentioned above.

2. Should You Refrigerate Pistachios?

If you love fresh pistachios, you may not want to put them in a refrigerator.

However, if you cannot eat them before they expire, you still ought to put your pistachio bag in the fridge to preserve them.

As common sense, the lower the storage temperature is, the longer they can last. Besides, the container should also be as airtight as possible to prevent moisture go inside.

3. How Many Pistachios Should I Eat Per Day?

Although eating a suitable amount can make pistachios healthy for you, but scientists have found out that a big enough amount enter your body will be bad for you (e.g., a bag of pistachios per day).

Usually, you had better take in from 1.5 to 3 ounces per day, which is equal to approximately a handful of this nut.

If you are addicted to this nut, try making some pistachio cookies or find other substitutes such as beans or peanuts to reduce the amount that you can eat.

Final Words

Pistachios have been known as a kind of incredibly beneficial food for humans with a lot of protein, vitamin B6, Thiamine, and many other nutrients, especially for the Low Calories diet as walnut.

Hopefully, now you have known how long do pistachios last, how to preserve them, and avoid using bad ones accidentally to get the best benefits of the nut. Thanks for reading!

Kevin Richard

Hi all! I’m Kevin. I spend plenty of time in the kitchen every day because I love cooking healthy and delicious foods for my family and friends. Cooking gives me a chance to be creative and fun. It’s also one of the most meaningful ways to express my love and take care of my little family.

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