How Long Do You Pressure Can Squash

You can pressure can squash for 30 to 90 minutes depending on the type of squash, the size of the jars, and your altitude.
 
If you’ve been wondering how long do you pressure can squash, the short answer is that most winter squash varieties need between 55 and 90 minutes of processing at 10 to 15 PSI.
 
Summer squash like zucchini is a different story because it’s low acid and needs the same careful pressure canning treatment.
 
In this post, we’ll break down exactly how long you pressure can squash, the right pressure for your altitude, and a few tips so your jars seal perfectly every time.
 
Let’s get into it.
 

How Long Do You Pressure Can Squash?

How long you pressure can squash depends on whether you’re canning it in chunks or as a mash, and whether you’re using pint or quart jars.
 
The USDA recommends pressure canning squash for these specific times at 10 PSI for a weighted gauge or 11 PSI for a dial gauge when you’re below 2,000 feet elevation.
 
Here are the general timeframes so you know how long do you pressure can squash in each scenario.
 

1. Cubed or Sliced Squash in Pints

If you’re canning cubed or sliced squash in pint jars, you’ll pressure can them for 55 minutes.
 
Pints are smaller, so the heat penetrates the squash faster and the processing time is shorter.
 
This is a great option if you only cook for one or two people and don’t want to waste a big jar.
 

2. Cubed or Sliced Squash in Quarts

For quart jars filled with cubed or sliced squash, the time jumps to 90 minutes.
 
Quarts hold more squash and the center of the jar takes longer to reach the safe internal temperature.
 
That’s why you pressure can squash in quarts for the full 90 minutes without cutting corners.
 

3. Mashed or Pureed Squash in Pints

If you’re pressure canning mashed or pureed squash in pints, you’ll process them for 65 minutes.
 
Mashed squash is denser than chunks, so it needs a bit more time than cubed pints even though the jar size is the same.
 
This is the trickiest form to can because the density slows heat penetration.
 

4. Mashed or Pureed Squash in Quarts

For mashed or pureed squash in quart jars, you’ll pressure can them for 90 minutes.
 
Again, the density and volume mean you can’t rush the process.
 
Always follow these tested times so you know how long do you pressure can squash safely.
 

Adjusting Pressure for Your Altitude

The time stays the same no matter where you live, but the pressure changes with elevation.
 
This is a step a lot of people miss when they pressure can squash at home.
 

1. Below 2,000 Feet

At sea level up to 2,000 feet, use 11 PSI on a dial gauge or 10 PSI on a weighted gauge.
 
This is the baseline for how long do you pressure can squash in most kitchens across the country.
 

2. Between 2,001 and 4,000 Feet

Bump your dial gauge to 12 PSI, and if you’re using a weighted gauge, keep it at 15 PSI.
 
Higher altitudes mean water boils at a lower temperature, so you need more pressure to reach the same heat.
 

3. Between 4,001 and 6,000 Feet

Go up to 13 PSI on a dial gauge and stay at 15 PSI on a weighted gauge.
 

4. Above 6,000 Feet

Use 14 PSI on a dial gauge and 15 PSI on a weighted gauge.
 
No matter your altitude, the processing time for how long do you pressure can squash stays the same.
 
Only the pressure changes.
 

Tips for Pressure Canning Squash Safely

Squash is a low-acid vegetable, which means it must be pressure canned, never water bath canned.
 
Here are a few tips to make sure your jars turn out perfectly.
 

1. Always Use a Pressure Canner

A water bath canner can’t reach the 240°F needed to kill botulism spores.
 
Only a pressure canner gets hot enough, so this is non-negotiable when you pressure can squash.
 

2. Pack Squash Loosely

Don’t cram the squash into the jars.
 
Leave about an inch of headspace and pack it loosely so heat can circulate.
 

3. Add Boiling Water or Syrup

Cover the squash with boiling water or a light syrup, leaving that one-inch headspace.
 
This keeps the squash moist and helps with heat transfer inside the jar.
 

4. Vent the Canner Properly

Let the canner vent steam for a full 10 minutes before you start the timer.
 
This step ensures the pressure builds correctly and that you pressure can squash at the right temperature.
 

5. Let Jars Cool Naturally

After the timer goes off, turn off the heat and let the pressure drop on its own.
 
Don’t rush this part or you risk losing liquid from the jars and weakening the seal.
 

So, How Long Do You Pressure Can Squash?

You pressure can squash for 55 to 90 minutes depending on whether you’re using pints or quarts and whether the squash is cubed or mashed.
 
The pressure needs to be adjusted for your altitude, but the processing time stays the same no matter where you live.
 
Now that you know how long do you pressure can squash safely, you can fill your pantry with jars of home-canned squash that will last for years.
 
Happy canning, and enjoy every jar.