How To Can Squash And Onions

You can can squash and onions together in a water bath canner using a few simple steps, and it’s a great way to preserve a taste of summer all year long.
 
This classic combination is a staple in many Southern kitchens, and knowing how to can squash and onions properly means you’ll have a ready-made side dish whenever you need one.
 
If you’ve been wondering how to can squash and onions safely, you’re in the right place.
 
In this post, we’ll walk through why canning squash and onions works so well, the exact steps for how to can squash and onions, and some tips for making sure your jars seal perfectly every time.
 
Let’s dive in.
 

Why Canning Squash and Onions Works So Well

Canning squash and onions is a match made in preserving heaven, and here’s why:
 

1. Onions Add Natural Acidity and Flavor

Onions bring a mild natural acidity to the mix, which helps balance the sweetness of the squash.
 
When you can squash and onions together, the onions infuse the squash with a savory depth that plain canned squash just can’t match.
 
This flavor boost is one big reason home canners love this combination so much.
 

2. Squash Holds Up Beautifully in Jars

Summer squash like zucchini and yellow squash are firm enough to hold their shape during processing.
 
That means when you can squash and onions, you end up with tender but not mushy pieces that still taste fresh when you open the jar months later.
 
This texture is exactly why canning squash and onions is such a reliable method for putting up your garden surplus.
 

3. It Saves Garden Surplus From Going to Waste

If you’ve ever had a zucchini plant, you know how quickly the harvest piles up.
 
Learning how to can squash and onions turns that overwhelming abundance into shelf-stable jars you can enjoy for up to a year.
 
Instead of giving away squash to every neighbor on the block, you can can squash and onions and actually enjoy the rewards yourself.
 

How to Can Squash and Onions Step by Step

Here’s the step-by-step process for how to can squash and onions safely using a water bath canner.
 

1. Gather Your Ingredients and Equipment

To can squash and onions, you’ll need about 12 cups of sliced squash, 4 cups of sliced onions, pickling salt, vinegar, and water for the brine.
 
You’ll also need clean pint or quart jars, lids, rings, a water bath canner, and a jar lifter.
 
Having everything ready before you start makes the whole process of how to can squash and onions go much smoother.
 

2. Prepare the Squash and Onions

Wash your squash, trim the ends, and slice them into uniform rounds or half-moons.
 
Peel and slice the onions thinly so they’ll soften evenly during processing.
 
Keeping the pieces similar in size is important when you can squash and onions, because even cooking gives you the best texture.
 

3. Make the Pickling Brine

In a large pot, combine equal parts vinegar and water, then add pickling salt and a little sugar if you like.
 
Bring the brine to a boil and stir until the salt and sugar dissolve completely.
 
This brine is what makes it safe to can squash and onions, since the added acid keeps the low-acid squash safe for water bath canning.
 

4. Pack the Jars and Add the Brine

Pack the squash and onion slices tightly into hot, sterilized jars, leaving about half an inch of headspace.
 
Ladle the hot brine over the vegetables, making sure everything is fully covered.
 
Run a bubble popper or plastic knife around the inside of the jar to release trapped air, since this step matters when you can squash and onions.
 

5. Process in a Water Bath Canner

Wipe the rims, place the lids and rings on, and lower the jars into boiling water.
 
Process pints for about 15 minutes and quarts for about 20 minutes, adjusting for your altitude.
 
Once the timer goes off, turn off the heat and let the jars sit for five minutes before removing them to cool.
 
That five-minute rest is a small step that makes a big difference in how well your jars seal when you can squash and onions.
 

Tips for Successfully Canning Squash and Onions

A few extra tips can make your first batch of canned squash and onions turn out perfectly.
 

1. Never Skip the Acid

Squash is a low-acid vegetable, so the vinegar brine is non-negotiable when you can squash and onions in a water bath canner.
 
Skipping the acid could put your jars at risk, so always follow a tested recipe when you can squash and onions.
 

2. Check Your Seals Before Storing

After 12 to 24 hours, press the center of each lid to confirm it doesn’t pop back.
 
Any jars that didn’t seal should go straight into the fridge and be eaten within a couple of weeks.
 
This habit keeps every batch of squash and onions you can safe and delicious.
 

3. Let the Flavors Meld for a Few Weeks

Freshly canned squash and onions taste good, but they taste great after about three to four weeks.
 
The onions mellow and the brine soaks into the squash, giving you a side dish that’s ready to serve straight from the jar.
 
That waiting period is honestly the hardest part of learning how to can squash and onions.
 

So, Can You Can Squash and Onions?

You can can squash and onions in a water bath canner as long as you use a proper vinegar brine to keep everything safe.
 
Home canners love this combination because it preserves garden surplus, adds fantastic flavor, and gives you shelf-stable jars that last up to a year.
 
Just remember to slice your vegetables evenly, never skip the acid, and always check your seals before storing.
 
Now that you know how to can squash and onions, it’s time to fire up that canner and get started.
 
Happy canning.