How Long Do You Pressure Can Squash

You can pressure can squash for 20 to 30 minutes in a pressure canner when you cut it into cubes and pack it into jars.
 
But the exact answer to how long do you pressure can squash depends on what type of squash you’re working with and whether you’re doing pints or quarts.
 
Squash is a low-acid vegetable, so it absolutely has to be pressure canned to be safe.
 
Water bath canning won’t cut it here because the temperature never gets high enough to kill the bacteria that cause botulism.
 
So if you’ve been wondering how long do you pressure can squash, you’ve come to the right place.
 
In this post, we’ll break down the exact processing times for different squash varieties and walk you through the steps so your jars come out safe and shelf-stable.
 
Let’s dive in.
 

How Long Do You Pressure Can Squash? Here’s the Real Answer

You pressure can squash for 20 minutes for pints and 25 minutes for quarts when you’re using a dial-gauge pressure canner at 11 pounds of pressure.
 
If you’re using a weighted-gauge canner, the same times apply but you’ll process at 10 pounds of pressure instead.
 
Those times jump to 30 minutes for pints and 35 minutes for quarts when you’re canning squash in a dial-gauge canner at higher altitudes.
 
And if you’re at sea level up to 2,000 feet, those standard times hold true.
 
But here’s where people get confused about how long do you pressure can squash, because not all squash is treated the same.
 

1. Winter Squash (Butternut, Acorn, Hubbard)

Winter squash like butternut, acorn, and Hubbard are the ones you’ll most commonly pressure can at home.
 
These varieties get peeled, seeded, and cut into one-inch cubes before packing into jars.
 
You don’t mash or puree winter squash before canning because the density can block heat penetration.
 
That’s why the answer to how long do you pressure can squash varies based on cube size.
 
Stick with uniform one-inch cubes and the 20-to-25-minute rule works perfectly.
 

2. Summer Squash (Zucchini, Yellow Squash)

Summer squash like zucchini and yellow squash are a different story entirely.
 
They’re technically safe to pressure can, but the texture turns to mush and most people don’t enjoy the results.
 
If you still want to pressure can summer squash, the times remain the same as winter squash.
 
So how long do you pressure can squash like zucchini?
 
You still pressure can it for 20 to 30 minutes depending on jar size, but honestly freezing is a better option for summer varieties.
 

3. Spaghetti Squash

Spaghetti squash can be pressure canned too, but it’s tricky because of its stringy texture.
 
You’ll want to cook it first, scoop out the strands, and then pack it into jars.
 
The processing time for how long do you pressure can squash like spaghetti squash stays the same at 20 to 25 minutes.
 

Step-By-Step Guide to Pressure Canning Squash

Knowing how long do you pressure can squash is only half the battle.
 
Here’s the full process so you get it right from start to finish.
 

1. Prep Your Squash

Wash your squash thoroughly, then peel, seed, and cut it into one-inch cubes.
 
Don’t puree or mash it because that changes the density and processing time.
 
You can boil the cubes for two minutes before packing to help them settle better in the jars.
 

2. Pack the Jars

Fill hot, sterilized jars with the squash cubes, leaving one inch of headspace at the top.
 
Add boiling water to cover the cubes, still keeping that one-inch headspace.
 
Remove air bubbles with a plastic spatula and wipe the rims clean.
 

3. Process in the Pressure Canner

Place your jars in the pressure canner with two to three inches of hot water in the bottom.
 
Lock the lid and let steam vent for 10 minutes before adding the weighted gauge or closing the petcock.
 
Bring the pressure up to 11 pounds (dial gauge) or 10 pounds (weighted gauge).
 
Now here’s where the question of how long do you pressure can squash gets its final answer.
 
Start your timer once the pressure is reached and process pints for 20 minutes or quarts for 25 minutes.
 

4. Cool and Store

Turn off the heat and let the pressure drop naturally.
 
Don’t rush this part by running cold water over the canner.
 
Once the pressure reads zero, wait two more minutes, then open the lid.
 
Let jars cool for 12 to 24 hours, check the seals, and store them in a cool, dark place.
 

Common Mistakes to Avoid When Canning Squash

Even when you know how long do you pressure can squash, small mistakes can ruin your batch.
 

1. Using a Water Bath Canner

Never water bath can squash because it’s a low-acid food.
 
The temperature in a water bath canner only reaches 212°F, which isn’t hot enough to destroy botulism spores.
 
A pressure canner reaches 240°F or higher, and that’s the only safe way to can squash.
 

2. Mashing or Pureeing Before Canning

Mashed squash is too dense for heat to penetrate properly.
 
If you want squash puree, can the cubes first and mash them when you open the jar.
 

3. Skipping the Altitude Adjustment

If you live above 2,000 feet, you need to increase your pressure.
 
At 2,001 to 4,000 feet, use 12 pounds for a dial gauge or 15 pounds for a weighted gauge.
 
Knowing how long do you pressure can squash also means knowing your altitude matters just as much as your timer.
 

So, How Long Do You Pressure Can Squash?

You pressure can squash for 20 minutes for pints and 25 minutes for quarts at 11 pounds of pressure with a dial-gauge canner.
 
If you’re using a weighted gauge, process at 10 pounds for the same amount of time.
 
Altitude adjustments and jar size both play a role, so double-check your numbers before you start.
 
Now that you know how long do you pressure can squash, you can stock your pantry with jars of safe, home-canned squash that lasts for years.
 
Happy canning.