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Plant Protein

Do Peanuts Go Bad or Are They Good Forever?

Peanuts are a popular snack food that may even be in your pantry, but do peanuts go bad? And if so, how can you tell? This article will tell you everything you need to know about types of peanuts, whether they're going bad, and how to store them safely.

Roots & Routes hide
1 What Are Peanuts?
2 How Long Do Peanuts Last?

So let's go nutty!

What Are Peanuts?

Peanuts are a type of nut that grows in the ground. Contrary to popular belief, the USDA's Dietary Guidelines for Americans classify peanuts and peanut butter in the nuts and seeds category. Although peanuts are botanically a legume, either way, nuts and legumes are both nutrient-dense.

How to Store Peanuts

Opt for a cool, dry place for the ideal storage temperature of around  34 to 41 degrees Fahrenheit with a humidity level of 55 to 70 percent (1). The storage location may vary depending on your geographic location.

Shell vs Unshelled

shell peanuts up close

Peanuts come from big, recognizable shells. They can be stored inside or outside their shells, but removing the shells will reduce their shelf life.

Fridge vs Pantry vs Frozen

Storing peanuts in the fridge will help them last longer than storing them at room temperature. The cooler temperature helps keep the oils from rancid, but both methods can work depending on your location.

Do Peanuts Go Bad?

Yes! Peanuts can go bad or rancid. They may not smell horrible or look moldy like other foods. There are some signs you can look out for to tell if you should pass on the nuts.

How to Tell If Peanuts Are Bad

When peanuts go bad, they will develop a sour smell and may taste rancid. The texture may also change and become rubbery or mushy. If you notice any of these signs, it's best to discard the batch of nuts as they are no longer safe to eat.

These are good tips when buying from bulk bins with no expiration date. Dating your items when you get them can also be helpful.

Signs Your Peanuts Have Gone Bad

  • Lacking a nutty flavor
  • A mushier than usual texture
  • They've developed a sour taste
  • The shape has changed and appears shriveled up
  • You can visually see mold

How Long Do Peanuts Last?

Peanuts out of their shells have a shorter shelf life and don't last as long as those in their shells. To prolong their life, you can put them in an airtight container in the fridge.

Need them to last even longer? A freezer is a long-term option.

peanut storage time for do peanuts go bad.

What Happens When You Eat Expired Peanuts

If you eat expired peanuts, you may get a stomach ache, but the likelihood of you eating more than 1 to 2 rancid peanuts is low because they taste awful. Peanuts that have gone bad will also taste rancid and bitter.

So, if your peanuts don't taste right, it's probably best to toss them out.

What To Do With Old Peanuts?

To avoid the possibility of them going bad, buy only what you need, not a surplus. For nuts that are a little old but aren't inedible or unsafe to eat, use them up in new and creative ways!

You could even try adding crushed peanuts on top of overnight oatmeal.

If you have too many peanuts, make homemade peanut butter or feed them to outdoor birds. Do not feed birds moldy nuts. It's not good for them.

open jar of peanut butter

For the nuts that are old and you shouldn't eat, you can compost them. If you suspect your peanuts have gone bad, it's best to err on the side of caution and discard them.

The bottom line is that peanuts are pretty shelf-stable and last longer when shelled. If you want to extend the shelf-life, buy them in the shell or store them in the fridge or freezer.

Have your peanuts gone bad? Let me know in the comments!

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  1. hoarding hank says

    well I just ran across a couple bags of unshelled peanuts that I bought about a coon's age ago I never ate them because as you can imagine I have a lot of stuff all over my house I had a few that didn't taste rancid but they did taste they did seem mushy then I lifted the bag and I saw inside the bottom of the plastic bag a bunch of these little bug things that I've been seeing around my house for quite a while I thought they were coming in from the outside a crack or something in the wall or through the floor but apparently they were nesting in my nuts I'm not sure what kind of bugs they were kind of like little beetles not roaches anyway something to be aware of if you keep your nuts lying around for a long time I had them in a sealed plastic bag but apparently the bugs made their way into them. probably didn't help that I didn't have them in a cabinet or the refrigerator they were just inside of a bowl inside of the grocery store bag inside of this like brown paper bag that they came in in the future I'll try to eat my stuff faster or at least pick up the bag and make sure there's no little buggers underneath before I start eating. I'm probably going to just buy the sealed packages they're like airtight sealed in the future maybe they snuck in with the peanuts at the time I bought em who knows. these things were kind of what I would consider loose and a brown paper bag not sealed in the airtight container the sealed Ones cost more but I think they're less likely to have bugs

    Reply

  2. zidane says

    this article is very useful, thank you for making a good article

    Reply

  3. ME says

    Be careful about composting peanuts. Nut allergies are fairly common and am unsuspecting person with an allergy potentially still have a reaction to what they think is a safe food because of its exposure to peanuts in compost.

    Reply

    • Rhyan Geiger, RDN says

      Very good call out! Thanks for adding this point of view

      Reply

  4. Kathleen Fishback says

    Why not use your peanuts before they go rancid. Vacuum pack and freeze for longer storage. And use those peanuts!!!! There’s no limit that I am aware to the ways to use peanuts.

    Reply

  5. Ralph Ramirez says

    Hi, I found your article very interesting and a little confusing. You say that peanuts out of the shell have a shorter shelf life. Yet on your chart you say that shelled peanuts can last 4 months and unshelled peanuts only 4 weeks! So which is it, do they last longer shelled or unshelled?

    Reply

    • Rhyan Geiger says

      Hi Ralph!
      Pardon the confusion, they last longer shelled.

      Reply