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You can freeze squash and onions easily, and doing it right means you’ll have ready-to-cook ingredients any time you need them.
Whether you’re dealing with a bumper crop of summer squash or a bag of onions that’s about to go soft, freezing is one of the simplest ways to stop waste and save time later.
Learning how to freeze squash and onions properly comes down to a few key prep steps, because each vegetable behaves a little differently in the freezer.
In this post, we’ll walk through how to freeze squash and onions the right way so they keep their flavor, texture, and quality for months.
Let’s dive in.
How to Freeze Squash and Onions: The Basics
How to freeze squash and onions starts with understanding that squash and onions are not the same when it comes to freezing.
Squash has a high water content, so it needs to be blanched before freezing to stop enzymes that cause mushiness and off-flavors.
Onions, on the other hand, freeze beautifully with almost no prep beyond chopping.
Because of this difference, you should always freeze squash and onions separately rather than mixing them into one bag.
That way, you can thaw and cook each one the way it needs.
1. Choose Fresh, Firm Produce
The best frozen squash and onions start with the best fresh ones.
Pick squash that’s firm, heavy for its size, and free of soft spots.
For onions, choose bulbs that are firm and dry, with no sign of sprouting or mold.
If you freeze squash and onions that are already past their prime, the freezer won’t fix them.
2. Wash and Prep Thoroughly
Rinse your squash under cool water and scrub off any dirt.
For onions, peel away the papery skin and trim both ends.
When you freeze squash and onions, clean prep is what keeps them tasting fresh instead of funky.
How to Freeze Squash Step by Step
If you want to know how to freeze squash so it doesn’t turn to mush, blanching is the answer.
1. Slice or Cube Your Squash
Cut summer squash into half-inch slices or cubes.
If you’re freezing winter squash like butternut, peel it first, then cube it.
Smaller, even pieces freeze and thaw more evenly.
2. Blanch in Boiling Water
Drop your squash pieces into boiling water for about three minutes.
This brief heat bath deactivates the enzymes that would otherwise break down texture and color.
3. Shock in an Ice Bath
Immediately transfer the squash to a bowl of ice water for three to five minutes.
This stops the cooking process cold so your squash stays firm.
4. Drain and Pat Dry
Drain the squash well and pat the pieces dry with a clean towel.
Extra moisture leads to ice crystals, which is the enemy of good frozen squash.
5. Flash Freeze Then Bag
Spread the pieces on a baking sheet and freeze for a couple of hours.
Once frozen solid, transfer them to freezer bags and squeeze out the air.
This is how to freeze squash so the pieces stay loose instead of clumping into one giant block.
How to Freeze Onions Step by Step
Freezing onions is even easier than squash, and there’s no blanching required.
1. Chop Your Onions
Dice or slice your onions however you plan to use them later.
Remember that frozen onions soften once thawed, so they’re best for cooking rather than eating raw.
2. Spread and Flash Freeze
Lay the chopped onions on a parchment-lined tray in a single layer.
Freeze for an hour or two until they’re individually frozen.
3. Transfer to Freezer Bags
Pour the frozen onion pieces into labeled freezer bags and seal them tight.
Now you’ve got a stash of onions ready to toss straight into any skillet.
4. Label and Date Everything
Always write the contents and the date on your bags.
When you freeze squash and onions, labeling is what saves you from mystery bags six months later.
Tips for Storing and Using Frozen Squash and Onions
How long do frozen squash and onions last?
Blanched squash keeps well for about ten to twelve months, while onions stay good for six to eight months.
Store everything at zero degrees Fahrenheit or below for the best quality.
When you’re ready to cook, you don’t always need to thaw.
Frozen onions can go straight into a hot pan.
Frozen squash is best added to soups, stews, casseroles, or stir-fries where a little extra softness won’t matter.
If you do thaw your squash, let it drain in a colander so the excess water doesn’t water down your dish.
And here’s a bonus: you can freeze squash and onions together for soup starters.
Just blanch the squash first, then combine it with chopped onions in a bag so everything’s ready for the pot.
So, How Do You Freeze Squash and Onions?
You freeze squash and onions by prepping each one properly: blanch the squash, chop the onions, flash freeze both, and store them in airtight, labeled bags.
Freezing squash and onions is one of the easiest ways to preserve your harvest and cut down on prep time during busy weeknights.
With the steps above, you’ll know exactly how to freeze squash and onions so they stay fresh, flavorful, and ready whenever you need them.