How Long Do You Pressure Can Butternut Squash

You can pressure can butternut squash for 55 minutes for pints and 90 minutes for quarts using a weighted gauge pressure canner at 10 pounds of pressure, or 11 pounds if you’re using a dial gauge.
 
The exact time depends on your jar size, your altitude, and whether you’re packing the squash in cubes or as a puree.
 
If you’ve been wondering how long to pressure can butternut squash so it stays shelf-stable and safe, you’re in the right place.
 
In this post, we’ll walk through the exact pressure canning times for butternut squash, why those times matter, and how to prep your squash so every jar seals perfectly.
 

How Long Do You Pressure Can Butternut Squash?

Pressure canning butternut squash takes longer than water bath canning because squash is a low-acid vegetable.
 
Low-acid foods need the higher temperatures that only a pressure canner can reach to destroy harmful bacteria.
 
Here’s the breakdown so you know exactly how long to pressure can butternut squash based on your setup.
 

1. Processing Times for Cubed Butternut Squash

For cubed butternut squash packed in jars, you’ll pressure can pints for 55 minutes and quarts for 90 minutes.
 
These times come straight from the National Center for Home Food Preservation, so they’re tested and reliable.
 
You can pressure can butternut squash in cubes because the pieces heat evenly and stay firm enough to hold their shape.
 

2. Processing Times for Mashed or Pureed Squash

If you want to pressure can butternut squash as a puree or mash, the times change to 65 minutes for pints and 75 minutes for quarts.
 
Pureed squash is denser, so it takes longer for heat to reach the center of the jar.
 
Many home canners prefer to pressure can butternut squash in cubes and mash it later when they open the jar.
 
That said, you can safely pressure can pureed butternut squash as long as you follow the longer processing time.
 

3. Pressure Settings for Your Canner Type

A weighted gauge canner needs 10 pounds of pressure for both pints and quarts of butternut squash.
 
A dial gauge canner needs 11 pounds of pressure for the same jars.
 
If you live at a higher altitude, you’ll need to adjust these numbers upward, so check your canner’s manual.
 
Getting the pressure right is just as important as the time when you pressure can butternut squash.
 

Why You Have to Pressure Can Butternut Squash

You can’t safely can butternut squash in a water bath canner, and here’s why.
 
Squash has a pH above 4.6, which means it’s a low-acid food that can harbor Clostridium botulinum spores.
 
Boiling water only reaches 212°F, and that’s not hot enough to kill those spores.
 
A pressure canner reaches 240°F or higher, which is the temperature needed to make butternut squash safe for shelf storage.
 
So when you pressure can butternut squash, you’re not just cooking it, you’re making it shelf-stable and safe.
 

1. The Botulism Risk With Low-Acid Foods

Botulism spores survive in low-acid, oxygen-free environments, which is exactly what a sealed jar of squash becomes.
 
That’s why you must pressure can butternut squash instead of relying on a boiling water bath.
 
The high heat inside a pressure canner destroys those spores before they ever get a chance to grow.
 

2. Why Altitude Changes Your Time and Pressure

Water boils at a lower temperature as you go up in altitude, so you need more pressure to hit 240°F.
 
If you’re canning above 1,000 feet, increase your dial gauge pressure by 1 pound for every 2,000 feet of elevation.
 
With a weighted gauge, you’ll go from 10 pounds to 15 pounds once you pass 1,000 feet.
 
Knowing your altitude helps you pressure can butternut squash safely no matter where you live.
 

How to Prep Butternut Squash for Pressure Canning

Before you pressure can butternut squash, you need to prep it the right way.
 
Start by washing the squash, cutting it in half, and scooping out the seeds.
 
Peel the skin, then cut the flesh into 1-inch cubes.
 
You can also pressure can butternut squash raw-pack style by filling jars with raw cubes and covering them with boiling water.
 
Leave 1 inch of headspace, remove air bubbles, wipe the rims, and add your lids.
 
Then load your canner and process for the full time so you properly pressure can butternut squash.
 

1. Hot Pack vs. Raw Pack

With a hot pack, you boil the cubed squash for 2 minutes, then pack it into jars with the hot cooking liquid.
 
With a raw pack, you fill jars with raw cubes and top them off with boiling water.
 
Either method works when you pressure can butternut squash, though hot pack gives you a slightly better texture.
 

2. Common Mistakes to Avoid

Don’t pressure can butternut squash in jars larger than a quart, since bigger jars don’t heat through safely.
 
Don’t skip the headspace, because squash expands as it processes and can push the lid loose.
 
And never pressure can butternut squash with added butter, oil, or flour, since those ingredients can interfere with heat penetration.
 

So, How Long Do You Pressure Can Butternut Squash?

You can pressure can butternut squash for 55 minutes in pints and 90 minutes in quarts when cubed, or 65 minutes in pints and 75 minutes in quarts when pureed.
 
The exact time depends on your jar size and how you pack the squash.
 
Just remember that you must pressure can butternut squash rather than water bath it, and always adjust for your altitude.
 
Once you’ve got the timing down, you’ll pressure can butternut squash with confidence every season.