Freeze This Food

Can You Freeze Onions?

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Illustration of onions

Yes, and they are one of the easiest vegetables to freeze: chopped or sliced onions need no blanching whatsoever. Just dice them, freeze them on a tray, and bag them. They thaw soft, so they are strictly for cooking, not for raw garnish, and they keep their best flavour for a few months. Whole bulbs are the exception — blanch those first.

Can you freeze onions?

Yes — it freezes well
How long it keeps frozen
Best within about 3 to 6 monthsNCHFP notes raw frozen onions are best used within a few months, as the flavour fades faster than blanched vegetables. Frozen continuously they keep safe well beyond that; only the pungency and aroma dull.
How to freeze it
  1. Peel and chop or slice the onions to the size you usually cook with — diced, half-moons, or rings.
  2. Spread the pieces in a single layer on a lined tray and freeze for an hour or two until firm.
  3. Tip the loose frozen pieces into a bag or container, press out the air, and seal it tightly.
  4. Double-bag or use an airtight container so the smell does not travel to other freezer items.
How to thaw & use
Skip thawing — toss the frozen pieces straight into a hot pan, soup, or sauce, where they soften and release their moisture as they cook down.
Texture & quality
Freezing collapses the crisp cell structure, so thawed onions are limp and a little watery — fine for sautéing, stews, and soups, useless on a burger. The flavour also mellows over months, so a frozen onion is for the pot, not the salad bowl.

More in this group: Freezing vegetables

Frequently asked questions

Do you need to blanch onions before freezing?

Not if they are chopped or sliced — raw diced onions freeze well with no blanching at all. Only whole onion bulbs need a blanch (3 to 7 minutes until the centre heats through) before they go in the freezer.

How do you stop frozen onions smelling up the freezer?

Seal them properly. Use a thick freezer bag with the air pressed out, or an airtight container, and double-bag if your freezer is small. The strong aroma only escapes when the packaging is loose or thin.

Can you freeze caramelised or sautéed onions?

Yes, and they freeze beautifully. Cool the cooked onions, portion them into small bags or an ice-cube tray, and freeze. Drop a frozen block straight into the pan when a recipe wants a head start on that deep, sweet flavour.

Are frozen onions still good for cooking?

Very much so. They soften and lose their crunch, but in soups, stews, sauces, and stir-fries that softness is exactly what you want. Add them straight from frozen and they cook down just like fresh chopped onion.

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