Can You Freeze Onions?
Written by Jordan Morley · Reviewed against USDA FoodKeeper · Last updated 28 October 2026
Yes, you can freeze onions. Best quality within 10–12 months; it stays safe beyond that at a constant -18°C.
What freezing does to onions
Onions freeze well chopped or sliced, with no blanching, and can go straight into the pan from frozen. They go soft, so they are for cooking and not for salads. Most vegetables freeze better after a quick blanch (a short dip in boiling water, then straight into cold water), which stops the enzymes that otherwise cause off-flavours and colour loss. Texture still softens, so frozen vegetables are best cooked from frozen or used in soups, stews and sauces rather than salads. FoodKeeper gives onions a best-quality freezer window of 10–12 months. For comparison, the same database gives mushrooms 10–12 months, peppers 6–8 months, broccoli 10–12 months.
You can also check the calorie content of onions alongside their safety information.
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Onions next to similar foods
| Food | Freezer window |
|---|---|
| Broccoli | 10–12 months |
| Carrots | 10–12 months |
| Mushrooms | 10–12 months |
| Onions | 10–12 months |
| Berries | 12 months |
Of the 16 fruit and vegetable foods in the freezing guide, onions have a best-quality window that is longer than 11, equal to 3 and shorter than 1.
Onions: the other answers on this site
| Question | Short answer (links to the full page) |
|---|---|
| In the fridge | 2 months in the fridge; 1 month in the cupboard |
Common questions
How long can you freeze onions?
For best quality, up to 10–12 months (USDA FoodKeeper). It stays safe beyond that, because bacteria cannot grow at a constant -18°C; the time limit is about taste and texture, not safety. Label the pack with the date so you can use the oldest first.
How should I freeze onions?
Wash, prepare and blanch where suitable (broccoli, carrots), cool, drain well, then freeze in a single layer on a tray before bagging. Onions and peppers can be chopped and frozen raw for cooking.
How do I defrost onions?
Cook from frozen where possible; thawing first makes vegetables soggy.
Can you refreeze onions?
Not recommended.
Fridge or freezer for onions?
The fridge window for onions is 2 months (USDA FoodKeeper). If you are not going to finish it inside that window, freeze it while it is still fresh, ideally in the first day or two, since freezing only pauses the clock and anything frozen late goes in with less life left.
Is onions with freezer burn safe to eat?
Yes. Freezer burn is dried-out, greyish patches where air has reached the surface; it affects texture and flavour, not safety (USDA). Cut away badly affected areas if you like, and prevent it by wrapping tightly and pressing out the air.
Related answers
Primary source: USDA FoodKeeper.
General information only, not medical advice: see the medical disclaimer. Feeling unwell after eating something? Contact NHS 111 or your GP.