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How Long Do Raisins Last (And Why)?

Exact Answer: 2 Months To 3 Months

Many people believe that raisins have a significantly longer shelf life and it would not go bad before at least a couple of years just because it is considered nuts. But, on the contrary, raisins do not have an impressively long shelf life as compared to other nuts.

It is not a fixed time for how long raisins last, but in general cases, they last for about a minimum of 2 months to a maximum of 3 months. But, it must be noted that several different factors affect the shelf life of raisins.

How Long Do Raisins Last?

Storage conditions of the raisinsTime
Stored in the pantry (open packaging)1 month to 2 months
Stored in the pantry (closed packaging)2 months to 3 months
Stored in the fridge (open packaging)3 months to 4 months
Stored in the fridge (closed packaging)4 months to 6 months
Normal freezer1 year to 2 years
Industrial freezerIndefinite time

Some of the major factors that affect the time for how long raisins last could be the storage conditions of the raisins, the place where it is kept, the condition of the grapes, and other such factors.

Among all these factors, there is one major factor that plays a vital role in determining the shelf life of raisins and must be considered while calculating the time. That major factor is where the raisins are stored.

There are majorly three different places where raisins can be stored. Those three places are the pantry, fridge, and freezer. Depending upon these three storage places, the time for how long will raisins last varies.

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On average, raisins last for about a minimum of 1 month to a maximum of 2 months when they are stored in the pantry in open packaging. Whereas, raisins last for about a minimum of 2 months to a maximum of 3 months when they are stored in the pantry and are unopened.

Secondly, raisins last for about a minimum of 3 months to a maximum of 4 months when they are stored in the fridge and are opened. 

While on the other hand, raisins last for about a minimum of 4 months to a maximum of 6 months when they are stored in the fridge and are unopened.

Lastly, raisins have the longest shelf life when they are stored in the freezer. On average, raisins last for about a minimum of 1 year to a maximum of 2 years when kept in normal freezers.

Moreover, when raisins are kept in the industrial freezers then they last for an indefinite time.

Why Do Raisins Last That Long?

When the raisins are stored in the pantry, it generally means that raisins are kept at room temperature. The time for how long raisins last when stored in the pantry is lowest as compared to raisins which are stored in the fridge and the freezer.

Moreover, if the raisins are kept open in the pantry, then their shelf life is even smaller as compared to unpacked raisins or raisins packed in airtight packaging or sealed in a vacuum.

Secondly, if the raisins are stored in the fridge then it means that raisins are kept at a relatively low temperature as compared to the raisins kept in the pantry. Furthermore, raisins have a longer shelf life when stored at lower temperatures.

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Freezers can increase the shelf life of raisins to years and even indefinitely. It generally depends upon what type of freezer the raisins are stored in. The industrial freezers are very strong as compared to normal freezers, and thus they can store raisins for an indefinite time.

Conclusion

If you store raisins under not improper conditions of storage, then it would result in spoilage of raisins. Signs of spoilage are not as prominent in raisins and mainly nuts as compared to other edible items.

The most prominent sign of spoilage in the raisins is a peculiar odor. Apart from odor, in certain cases, the visibility of blackish or blueish mold can show signs of bacterial growth over raisins.

If such signs of spoilage are visible then one must avoid eating these raisins or it can lead to serious health issues, such as food poisoning.

References

  1. https://pubs.acs.org/doi/abs/10.1021/jf0009753
  2. https://www.sciencedirect.com/science/article/pii/S0271531710001375
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