Yes, you can freeze onions. Freezing is useful when you have too many onions or want ready-chopped portions for sauces, soups, curries, casseroles and stir-fries. The texture softens, so frozen onions are for cooking rather than raw salads.
Quick reference chart
| Question | Best answer | Why it matters |
|---|---|---|
| Chopped onions | Yes | Freeze in small airtight portions. |
| Sliced onions | Yes | Useful for soups, stews and cooked toppings. |
| Cooked onions | Yes | Cool promptly before freezing. |
| Best freezer time | About 3 months | Use sooner for the brightest flavour. |
| Best use | Cooked dishes | Add straight from frozen; they soften after thawing. |
Step-by-step method
- Peel the onions and discard any soft or mouldy layers.
- Chop, dice or slice them into the size you usually use in cooking.
- Divide onions into small meal-sized freezer bags or airtight containers.
- Press excess air from bags, seal them tightly and label with the date.
- Freeze bags flat so they take up less space and are easier to separate.
- Add onions straight from frozen to a hot pan, soup, sauce, curry or stew; avoid using thawed onions raw.
Do frozen onions smell in the freezer?
Onions have a strong aroma, so use airtight freezer bags or containers and remove excess air before sealing. Keeping portions small also means you do not need to open and re-freeze a larger bag.
Can you freeze cooked onions?
Yes. Let cooked onions cool promptly, then freeze them in small portions. This is particularly useful for caramelised onions, onion bases for sauces, and leftover cooked onion mixtures.
Should you thaw onions before cooking?
Usually no. Add frozen onions directly to the pan or pot. They release some moisture, so cook over medium-high heat for a little longer if you want the water to evaporate.
What to read next
For more practical guides, see can you freeze peppers, can you freeze spinach, can you freeze mushrooms, Practical Guides hub.
Frequently asked questions
Can you freeze chopped onions?
Yes. Put chopped onions into small airtight freezer bags or containers, label them and add them straight from frozen to cooked dishes.
Can you freeze cooked onions?
Yes. Cool cooked onions promptly, portion them and freeze them in airtight containers.
Can you use frozen onions raw?
Frozen onions soften after thawing, so they are best used in cooked dishes rather than salads or raw toppings.
How long can you freeze onions?
For the best quality, use frozen onions within about three months.
BM_HARD_PUSH_20260805: Freezer-vegetable cluster: one dedicated parent URL for chopped, sliced and cooked onion-freezing intent. Ahrefs live matching-terms access remains unavailable, so no current volume or KD is claimed. Featured visual marker: BM_FREEZE_ONIONS_VISUAL_20260805.
For another freezer-vegetable staple, see how to freeze carrots raw, blanched or cooked.
For another freezer-friendly vegetable, see how to freeze broccoli and how to freeze cauliflower for useful meal-sized portions.
For a quick freezer side dish, see how to freeze green beans with a short blanch first.
For another useful home-grown glut, see how to freeze tomatoes for sauces, soups and cooking.
Pair onion freezer portions with this guide to freezing courgette for easy cooked meals.
For an easy soup or sauce base, add this guide to freezing celery alongside your freezer vegetables.
For another make-ahead meal basic, see how to freeze garlic as whole cloves or small cooking portions.
For an easy make-ahead meal, see how to freeze cooked pasta in useful portions.
For a separate sweet or savoury portion, see how to freeze egg yolks with a little sugar or salt.
For a separate sweet or savoury portion, see how to freeze egg yolks with a little sugar or salt.
For roast and leftover meal planning, see how to freeze gravy in small airtight portions.
For roast and leftover meal planning, see how to freeze gravy in small airtight portions.
For an easy batch-cooked dinner, see how to freeze chilli safely in meal-sized portions.
For an easy batch-cooked dinner, see how to freeze chilli safely in meal-sized portions.