How Long Do You Pressure Can Butternut Squash

You pressure can butternut squash for about 55 minutes for pint jars and 90 minutes for quart jars when using a weighted gauge pressure canner at 10 pounds of pressure.
 
If you’re using a dial gauge canner, you’ll process them at 11 pounds of pressure instead.
 
The exact time you pressure can butternut squash depends on your jar size and your altitude.
 
So if you’ve been wondering how long do you pressure can butternut squash, the short answer is: it depends on those factors, but the times above are your baseline.
 
In this post, we’ll break down exactly how long to pressure can butternut squash, why pressure canning is the only safe method, and the step-by-step process so you get it right every time.
 
Let’s get into it.
 

How Long Do You Pressure Can Butternut Squash?

When you pressure can butternut squash, the processing time is determined by the jar size you’re using.
 
Here’s the breakdown so you know exactly how long to pressure can butternut squash:

1. Pint Jars: 55 Minutes

If you’re pressure canning butternut squash in pint jars, you’ll process them for 55 minutes.
 
Pints are a great choice if you live alone or have a small family.
 
They heat through faster, so the time you pressure can butternut squash in pints is shorter.
 
Just remember that every minute still counts when it comes to safety.
 

2. Quart Jars: 90 Minutes

Quart jars need 90 minutes when you pressure can butternut squash.
 
The larger volume takes much longer for heat to penetrate all the way to the center.
 
That’s why the time to pressure can butternut squash in quarts jumps so significantly.
 
If you’re feeding a crowd or stocking your pantry, quarts are efficient, but you’ll be spending more time at the canner.
 

3. Adjust for Altitude

Altitude changes the pressure you need, not the time.
 
At sea level to 2,000 feet, use 10 pounds of pressure with a weighted gauge or 11 pounds with a dial gauge.
 
Above 2,000 feet, you’ll need to increase the pressure.
 
For a weighted gauge, use 15 pounds above 1,000 feet.
 
For a dial gauge, add 1 pound of pressure for every 2,000 feet of elevation.
 
The time you pressure can butternut squash stays the same no matter your altitude.
 
Only the pressure changes.
 

Why You Must Pressure Can Butternut Squash (Not Water Bath)

Butternut squash is a low-acid vegetable.
 
That means it cannot be safely processed in a boiling water bath.
 
The only safe way to can butternut squash is with a pressure canner.
 
Here’s why this matters so much:

1. Low-Acid Foods Harbor Botulism Risk

Clostridium botulinum spores thrive in low-acid environments without oxygen.
 
A boiling water bath only reaches 212°F, which isn’t hot enough to kill those spores.
 
When you pressure can butternut squash, the canner reaches 240°F or higher.
 
That’s the temperature needed to destroy botulism spores and keep your food safe.
 

2. You Cannot Can Pumpkin or Squash Butter

Here’s a common mistake: people try to can butternut squash puree or butter.
 
You should not do this.
 
The density of puree prevents heat from penetrating evenly, even in a pressure canner.
 
So you can pressure can butternut squash in cubes, but never as a puree or butter.
 
Freeze your puree instead.
 

3. Cubes Are the Safe Choice

When you pressure can butternut squash, always cut it into uniform 1-inch cubes.
 
Packing them in liquid (water or broth) allows heat to circulate properly.
 
This is the only tested and approved method for home canning butternut squash.
 

Step-by-Step: How to Pressure Can Butternut Squash

Now that you know how long do you pressure can butternut squash, here’s the process from start to finish.

1. Prep Your Squash

Wash, peel, and seed your butternut squash.
 
Cut it into 1-inch cubes.
 
Boil the cubes in water for 2 minutes, then pack them hot into clean jars.
 
Leave 1 inch of headspace.
 

2. Add Hot Liquid

Cover the cubes with boiling water or broth, maintaining that 1-inch headspace.
 
Use a debubbler to remove air pockets.
 
Wipe the rims, add your lids, and screw on the bands fingertip-tight.
 

3. Load the Canner and Process

Place jars on the rack in your pressure canner with 2-3 inches of hot water.
 
Seal the canner and vent steam for 10 minutes.
 
Then bring it to pressure and start your timer.
 
Remember: 55 minutes for pints, 90 minutes for quarts.
 

4. Let It Depressurize Naturally

Once the time you pressure can butternut squash is up, turn off the heat.
 
Let the canner cool and depressurize on its own.
 
Don’t rush this step by removing the weight or opening the lid early.
 
Wait 10 more minutes after the pressure drops to zero before opening.
 

So, How Long Do You Pressure Can Butternut Squash?

You pressure can butternut squash for 55 minutes in pints and 90 minutes in quarts at 10 pounds of pressure with a weighted gauge.
 
Adjust the pressure for altitude, but never shorten the time.
 
Pressure canning is the only safe method for this low-acid vegetable, and cubed is the only approved pack style.
 
Get the timing right, and you’ll have shelf-stable butternut squash ready for soups, stews, and sides all winter long.