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You can keep walnuts for up to a year or longer if you store them properly.
But how long your walnuts actually last depends on a few key factors, like whether they’re still in the shell and where you keep them.
If you’ve been wondering how long you can keep walnuts before they go bad, the answer isn’t as simple as a single number.
In this post, we’ll break down exactly how long you can keep walnuts, the best ways to store them so they last, and how to tell when they’ve gone bad.
Let’s dive in.
How Long Can You Keep Walnuts?
The short answer is that how long you can keep walnuts depends largely on how you store them and whether they’re shelled or unshelled.
Here’s what to expect:
1. Unshelled Walnuts Last the Longest
If your walnuts are still in their shells, you can keep them for up to 12 months in a cool, dry place.
And if you refrigerate or freeze them, that timeline stretches even further.
So how long can you keep walnuts in the shell?
In the pantry, about 6 to 12 months.
In the fridge, up to 18 months.
In the freezer, easily 2 years or more.
The shell acts as a natural protective barrier, keeping moisture and air away from the nut inside.
That’s why unshelled walnuts hold up so well over time.
2. Shelled Walnuts Have a Shorter Shelf Life
Once you remove the shell, the clock starts ticking faster.
You can keep shelled walnuts in an airtight container in the pantry for about 2 to 4 weeks.
In the fridge, they’ll stay fresh for up to 6 months.
And in the freezer, shelled walnuts can last up to a year.
The reason is simple: without the shell, the nut is exposed to air, light, and moisture, all of which speed up spoilage.
So if you’re asking how long you can keep walnuts after cracking them open, the answer is not nearly as long as you’d like.
3. Chopped or Ground Walnuts Go Bad Fastest
If your walnuts are chopped, ground, or processed, they have the shortest shelf life of all.
You can keep chopped walnuts for about 1 to 2 weeks in the pantry and up to 3 months in the fridge.
In the freezer, they’ll stay good for up to 6 months.
The smaller the pieces, the more surface area is exposed to oxygen, which means they go rancid quickly.
So how long can you keep walnuts that are already chopped?
Not long, so use them fast or freeze them.
How to Store Walnuts So They Last Longer
If you want to extend how long you can keep walnuts, proper storage is everything.
Here are the best ways to do it:
1. Keep Them Cool and Dark
Heat and light are the enemies of walnuts.
Store them in a cool, dark place like a pantry or cupboard away from your stove or any heat source.
If your kitchen runs warm, the fridge is a better option.
2. Use Airtight Containers
Oxygen is what makes walnuts go rancid.
So always store your walnuts in an airtight container, whether it’s glass, plastic, or a vacuum-sealed bag.
This is especially important for shelled walnuts because they have no natural protection.
3. Refrigerate or Freeze for Long-Term Storage
If you want to keep walnuts for more than a few months, the fridge or freezer is your best friend.
Refrigeration slows down the oxidation process, and freezing basically pauses it.
Just make sure your walnuts are in a sealed container or freezer bag before you put them in.
And if you’re freezing them, label the bag with the date so you know how long they’ve been in there.
4. Keep Them Away From Strong Odors
Walnuts absorb smells easily.
So don’t store them next to onions, garlic, or anything else with a strong odor.
Even in the fridge, keep them in a sealed container to protect their flavor.
How to Tell If Your Walnuts Have Gone Bad
Even if you follow all the storage rules, walnuts can still go bad eventually.
Here’s how to tell if yours are past their prime:
1. They Smell Rancid
Rancid walnuts have a sharp, bitter, or paint-like smell.
If you open the container and get hit with an off odor, toss them.
Fresh walnuts should smell mild and slightly nutty.
2. They Taste Bitter
If you bite into a walnut and it tastes bitter or sour, that’s a sign of spoilage.
Rancid oils are the culprit, and they won’t do your stomach any favors.
3. They Look Shriveled or Discolored
Fresh walnuts are plump and light in color.
If yours look shriveled, dark, or have mold spots, they’re past their prime.
4. They Feel Soft or Slimy
Walnuts should be firm and dry.
If they feel soft, mushy, or slimy, that’s a clear sign they’ve gone bad.
So, How Long Can You Keep Walnuts?
You can keep walnuts for up to a year or longer if you store them properly.
Unshelled walnuts last the longest, shelled walnuts have a shorter shelf life, and chopped walnuts go bad the fastest.
The key is to keep them cool, dark, and airtight, and to use the fridge or freezer for long-term storage.
And always check for signs of spoilage like a rancid smell, bitter taste, or shriveled texture before you eat them.
Hope this post has helped you understand how long you can keep walnuts and how to store them so they stay fresh as long as possible.