June 28, 2026, 10:51 am | Read time: 3 minutes
Onions are among the most essential basic ingredients in the kitchen. They add flavor and depth to soups, sauces, vegetable dishes, and meat dishes. But what can you do if you’ve bought too many onions or don’t want opened ones to spoil? Can you freeze them?
With proper storage, onions can often be kept for weeks or even months. Freezing can still be useful—especially for already peeled or cut onions. It also saves time, as the onions can later be used directly in portions for cooking.
Can you freeze onions?
Yes. Both raw and cooked onions can be frozen. This method is particularly suitable for onions that will later be cooked, fried, or braised. While the flavor is largely preserved, the texture changes. After thawing, onions are significantly softer and are therefore best suited for hot dishes.
Freezing whole or chopped onions–which is better?
In general, both whole and chopped onions can be frozen. However, it is advisable to peel the onions before freezing and dice, chop, or slice them depending on their intended use, according to the National Center for Home Food Preservation at the University of Georgia. Chopped onions freeze faster, are easier to portion later, and can be used directly for cooking.
Whole onions, on the other hand, take more time to freeze and thaw. Additionally, they become very soft after thawing and are harder to cut. For most households, it is therefore more practical to freeze onions already prepared for cooking.
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These onions can be frozen
In general, almost all types of onions can be frozen without any problems. This includes yellow cooking onions, red and white onions, shallots, and green onions. All varieties largely retain their typical flavor when frozen, but their texture changes and they become softer after thawing. Therefore, they are particularly well-suited for dishes where the onions are cooked, fried, or braised. For raw consumption, such as in salads or on burgers, fresh onions are the better choice due to their crunchy texture.
Why do onions become soft after thawing?
The reason lies in their high water content. When frozen, small ice crystals form that damage the cell walls. When thawed, liquid leaks from the cells, causing the onion to lose its firm structure. For soups, sauces, or stir-fry dishes, this hardly matters. For salads or burgers, where crunchy onions are desired, thawed onions are less suitable.
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How to freeze onions properly
Onions are best frozen peeled and prepared for cooking. Depending on their intended use, they can be cut into cubes, slices, or rings and placed in airtight freezer bags or containers in portions. To avoid freezer burn, as much air as possible should be removed from the packaging. For better portioning, it is advisable to pre-freeze the chopped onions on a plate or baking sheet before transferring them to freezer bags. This prevents the pieces from sticking together later.
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What to consider when thawing onions
In most cases, frozen onions do not need to be thawed first. They can be added directly from the freezer to the pot or pan. This saves time and prevents the onions from losing additional liquid. If thawing is necessary, it should be done as gently as possible in the refrigerator. Thawed onions should then be processed promptly and not stored at room temperature for an extended period. Refreezing is not recommended, as both quality and food safety can suffer.