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Yes, you can can walnuts, and it’s actually one of the most rewarding preservation projects you can take on if you love that deep, rich flavor of home-canned nuts.
If you’ve been asking yourself, “can you can walnuts?” the short answer is a resounding yes — but it’s not quite the same process as canning peaches or pickles.
Instead of packing them in syrup, you’ll be canning them in a pressure canner to store them safely for a long time.
Many people wonder if you can can walnuts without them turning mushy or rancid, and the good news is that when you do it right, they keep beautifully.
In this post, we’ll walk through why you can can walnuts, the tools you need, and the step-by-step process for putting up your own jars.
Why You Can Can Walnuts
You can can walnuts because they’re a low-acid food that needs pressure canning to be shelf-stable.
Here’s why this method works so well for them.
1. Pressure Canning Eliminates Spoilage Risks
Walnuts are a low-acid food, which means a boiling water bath won’t cut it.
You can can walnuts safely only when you use a pressure canner that reaches 240°F or higher.
At that temperature, you destroy the bacteria, molds, and yeasts that would otherwise cause spoilage.
This is the same reason you can can walnuts alongside other low-acid foods like carrots or beans.
2. Proper Sealing Keeps Out Oxygen and Moisture
When you can walnuts, the vacuum seal on the jar is your best friend.
Oxygen is what makes nuts go rancid over time.
A tight seal after pressure canning removes the air and locks moisture out.
That’s why canning walnuts is a smart way to extend their shelf life far beyond the pantry.
3. Heat Helps Stabilize Natural Oils
Walnuts are loaded with healthy oils, and those oils can turn bitter if exposed to air and light.
The heat from pressure canning actually helps stabilize those oils just enough to slow rancidity.
So when you can walnuts, you’re not just storing them — you’re protecting their flavor.
4. You Control What Goes Into the Jar
When you can walnuts at home, you decide whether to add salt or leave them plain.
You can can walnuts dry or with a light brine, depending on how you plan to use them.
That flexibility is a big reason home canners love this project.
How to Can Walnuts Step by Step
Learning how to can walnuts is simpler than you might think, but you do need to follow safe canning practices.
1. Gather Your Equipment
To can walnuts, you’ll need a pressure canner, clean mason jars, new lids, and a jar lifter.
You’ll also want a towel or rack for cooling the jars afterward.
Make sure your pressure canner has a working gauge and that you’ve read the manual.
2. Prepare the Walnuts
Start with fresh, shelled walnut halves or pieces.
Spread them on a baking sheet and toast them lightly in a 200°F oven for about 10 minutes to dry them out.
This step helps remove excess moisture so you can can walnuts without them getting soggy.
3. Pack the Jars
Fill clean, hot jars with the dried walnuts, leaving about 1 inch of headspace.
You can can walnuts dry like this, or you can add a pinch of salt to each jar for flavor.
Wipe the rims, place the lids on, and tighten the bands to fingertip tight.
4. Process in the Pressure Canner
Place the jars on the rack in your pressure canner with 2 to 3 inches of water in the bottom.
Seal the canner and bring it to 10 pounds of pressure (adjust for altitude).
Process pint jars for 75 minutes and quart jars for 90 minutes.
Once the time is up, let the pressure drop naturally before opening the canner.
5. Cool and Check the Seals
Let the jars cool on a towel for 12 to 24 hours without touching them.
Then press the center of each lid — if it doesn’t pop, you’ve successfully sealed the jars.
Any jars that didn’t seal should go in the fridge and be used first.
Tips for Storing Canned Walnuts
Once you can walnuts, proper storage keeps them tasty for months.
Keep the jars in a cool, dark place like a pantry or basement.
Avoid spots near the stove or windows where heat and light can speed up rancidity.
If you want them to last even longer, you can can walnuts and then store the sealed jars in the freezer.
Just make sure the jars are completely cool before moving them.
And always label your jars with the date so you know when you canned them.
Common Mistakes to Avoid When You Can Walnuts
Even though you can can walnuts without much fuss, a few missteps can ruin a batch.
1. Skipping the Pressure Canner
Never try to can walnuts in a water bath canner.
It won’t get hot enough to kill the bacteria that cause botulism.
If you want to can walnuts safely, pressure canning is non-negotiable.
2. Using Old or Damaged Lids
Always use new lids when you can walnuts.
Old lids won’t seal properly, and that means air gets in and spoils your nuts.
Check the bands too, and replace any that are rusty or bent.
3. Overpacking the Jars
Leave that inch of headspace when you can walnuts.
If you fill the jars too full, the contents can expand and break the seal during processing.
A little breathing room goes a long way.
So, Can You Can Walnuts?
You can can walnuts, and doing so is a great way to keep your harvest or bulk buys fresh for months.
Just remember that you can can walnuts only with a pressure canner, proper jars, and a little patience.
Whether you toast them first or pack them dry, the process is straightforward once you get the hang of it.
So go ahead and can walnuts this season — your future self will thank you when you crack open a jar of home-preserved goodness.
Happy canning, and enjoy every nutty bite.