How to Freeze Onions

Learn how to freeze onions so you can preserve extras from the garden and have chopped onions ready for soups, stews, casseroles, skillet meals, and more.

Freezing onions is one of the easiest ways to preserve extras from the garden, bulk purchases, or onions from storage that need to be used up. Once frozen, they are ready to toss into soups, stews, sauces, casseroles, skillet meals, and other cooked recipes without any extra prep.

I freeze onions in a couple of different ways in my own kitchen. If I only use part of an onion for a recipe, I often chop the rest into chunks and add it to a freezer bag. Later, when I need onion for another meal, I can grab what I need and chop it smaller while it is still partially frozen.

When I freeze a larger batch of onions for food storage and easy meal prep, I like to prepare them in the ways I use most often: diced onions for everyday recipes and sliced onions for fajitas, stir-fries, and skillet meals. Having a stash of chopped onions in the freezer saves time on busy nights and helps prevent good onions from going to waste.

Can You Freeze Onions?

Yes, you can freeze onions, and they are one of the easiest vegetables to prepare for the freezer. Raw onions can be peeled, chopped, diced, or sliced, then packed and frozen for later use.

The main thing to know is that freezing changes the texture of onions. Once thawed, they will be softer and more watery than fresh onions, so they are not the best choice for salads, sandwiches, fresh toppings, or recipes where you want a crisp bite.

Frozen onions are best used in cooked dishes where they can blend right into the recipe. Add them directly from the freezer to soups, stews, chili, casseroles, pasta sauce, taco meat, stir-fries, fajitas, and skillet meals. There is usually no need to thaw them first, though they may release a little extra moisture as they cook.

Do You Have to Blanch Onions Before Freezing?

No, chopped, diced, and sliced onions do not need to be blanched before freezing. This is one of the reasons onions are so easy to preserve in the freezer.

Blanching is often recommended for many vegetables because it helps slow enzyme activity and preserve quality during freezer storage. But onions are mostly used as a flavoring ingredient in cooked recipes, and they can be frozen raw without blanching.

To freeze onions, simply peel, trim, chop, dice, or slice them, then package and freeze. You can spread them on a baking sheet first so the pieces freeze separately, or pack them directly into freezer bags if you plan to use them in larger amounts.

Whole bulb onions can be blanched and frozen, but I don’t find that method as useful for everyday cooking. Chopped, diced, or sliced onions are easier to package, easier to measure, and ready to add directly to recipes from the freezer.

Best Onions for Freezing

Most types of onions can be frozen, including yellow onions, white onions, red onions, sweet onions, and homegrown storage onions. Since frozen onions are best used in cooked recipes, choose the type you normally like to cook with.

• Yellow onions are a good all-purpose choice for soups, stews, sauces, casseroles, and skillet meals.
• White onions can be used the same way, especially in recipes where you want a sharper onion flavor.
• Red onions can also be frozen, but keep in mind that their color may soften or change a bit once cooked.
• Sweet onions freeze well too, although they tend to have a higher moisture content and may release more liquid as they cook.

Freezing is also a good option for garden onions or storage onions that are still usable but starting to soften, sprout, or show signs that they won’t keep much longer. As long as the onions are firm, clean, and free from mold or spoiled spots, they can be trimmed, chopped, and frozen before they go to waste.

Avoid freezing onions that are mushy, moldy, slimy, or have a sour or rotten smell. Freezing will not improve poor-quality onions, so start with onions you would still feel comfortable using fresh in a cooked recipe.

How to Chop Onions Without Tears

Chopping a large batch of onions can bring on the tears quickly. A sharp knife helps because it cuts through the onion more cleanly and crushes fewer cells. You can also chill the onions in the refrigerator before chopping, wear onion goggles, cut near a fan or open window, and leave the root end intact until the end.

Wearing kitchen gloves helps keep onion odor off your hands, and a vegetable chopper can make the job faster so you spend less time over the cutting board. If your eyes start to burn, step away from the onions and wash your hands thoroughly before rinsing your eyes with cool water.

How to Freeze Onions Step-by-Step

Preparing onions for the freezer is simple. You don’t need to blanch them or cook them first. Just peel, trim, cut, and package them in the way you are most likely to use them later. Here are the steps for freezing onions:

Step 1: Gather Your Equipment

Before you begin, gather your kitchen tools and freezer supplies so everything is ready to go. You will need:

• Cutting board
• Sharp knife
• Vegetable chopper (optional)
• Large prep bowl
• Rimmed baking sheets
• Parchment paper
• Food prep gloves (optional)
• Onion goggles (optional)
• Freezer bags or freezer-safe containers
• Permanent marker for labeling

A vegetable chopper is optional, but it can make the job so much faster if you are processing a large batch of onions. It also helps cut the onions into evenly sized pieces, which makes them easier to measure and use in recipes later.

I also find that wearing food prep gloves can help keep onion odor from lingering on my hands, especially when prepping a large batch for the freezer.

Step 2: Select Good Onions

Choose firm onions that are still in good condition. The onions should feel solid and heavy for their size, without mold, mushy spots, or a sour smell.

If you are using onions from storage, check them over carefully before freezing. It is fine to use onions that are beginning to soften slightly or sprout, as long as the onion itself is still firm and clean inside. Trim away any dry, bruised, or damaged areas before chopping.

Do not freeze onions that are moldy, slimy, mushy, or spoiled. Freezing will not improve poor-quality onions, so start with onions you would still be comfortable cooking with.

Step 3: Peel and Trim

Remove the loose, papery outer skins from the onions. Trim off the stem end and root end, then cut the onion in half from top to bottom.

If the onion has started to sprout, you can remove the green sprout from the center before chopping. Small sprouts are not usually a problem, but they can have a stronger flavor and may affect the texture.

Step 4: Cut the Onions for How You Cook

Think about the recipes you make most often, and cut the onions in a way that will be useful later.

For everyday cooking, I like to freeze diced onions because they can be added to so many recipes, including soups, stews, chili, casseroles, taco meat, pasta sauce, and meatloaf.

Sliced onions are useful for fajitas, stir-fries, sausage and peppers, sheet pan meals, and skillet dinners.

If you only have part of an onion left from another recipe, you can chop it into chunks and add it to a freezer bag. The chunks can be chopped smaller later while still partially frozen if needed.

Step 5: Choose a Freezing Method

Once the onions are peeled, trimmed, and cut, choose the freezing method that works best for how you plan to use them. Tray freezing keeps the pieces loose so you can scoop out small amounts as needed, while freezing onions flat in bags is faster and saves freezer space.

Option 1: Tray Freeze Onions

Tray freezing keeps the onion pieces separate so you can scoop out only what you need for a recipe.

1. Line a rimmed baking sheet with parchment paper. Spread the chopped, diced, or sliced onions in a single layer over the parchment. Try to keep the pieces from piling up too much so they freeze quickly and evenly.
2. Place the baking sheet in the freezer and freeze until the onions are solid, about 1 to 2 hours. Once frozen, transfer the onions to freezer bags or freezer-safe containers.
3. Press out as much air as possible, seal, label, and return them to the freezer.

This method is especially useful for diced onions because you can measure out just a handful, 1/2 cup, or 1 cup at a time without thawing the whole package.

Option 2: Freeze Onions Flat in Bags

Freezing onions flat in bags is a quick option when you are short on time or freezer space.

1. Add the chopped, diced, or sliced onions directly to freezer bags. Spread the onions into a thin, even layer, then press out as much air as possible before sealing. Label the bags with the type of onion, the cut, and the date.
2. Lay the bags flat in the freezer until solid. Once frozen, you can stack the bags upright or flat to save space. The onion pieces may freeze together more than tray-frozen onions, but the thin layer makes it easier to break off what you need.

This method works well if you usually add frozen onions by the handful to soups, stews, chili, casseroles, and skillet meals.

How to Freeze Leftover Onion Pieces

You don’t have to wait until you have a large batch of onions to freeze them. If you use only part of an onion for a recipe, chop the rest into chunks and add them to a freezer bag.

Keep the bag in the freezer and add to it whenever you have extra onion pieces.

Later, you can use the frozen chunks in cooked recipes or chop them smaller while they are still partially frozen.

This is an easy way to prevent leftover onions from drying out in the refrigerator or going to waste.

Step 6: Label and Freeze

Label each bag or container with the type of onion, the cut, and the date. Place the onions in the freezer as soon as they are packaged. For best quality, use frozen onions within a few months.

How Long Do Frozen Onions Last?

Frozen onions are best used within a few months for the best flavor and texture. They may remain safe longer if kept frozen at 0°F, but their quality will slowly decline the longer they are stored.

Over time, frozen onions can lose flavor, dry out, or develop freezer burn, especially if they are not packaged well. For the best results, remove as much air as possible from freezer bags or containers before freezing, and keep the onions tightly sealed.

Be sure to label each package with the date so you can use the oldest onions first. I like to freeze onions in amounts I know I will use within a few months, then refresh my freezer stash as needed when I have extra onions from the garden, storage, or meal prep.

Ways to Use Frozen Onions

Frozen onions are best used in cooked recipes where their softer texture won’t matter. There is usually no need to thaw them first. Just add the frozen onions directly to the pan, pot, slow cooker, or baking dish.

• Use frozen diced onions in soups, stews, chili, casseroles, taco meat, meatloaf, pasta sauce, skillet meals, and other recipes where you would normally cook chopped onions.
• Frozen sliced onions are useful for fajitas, stir-fries, sausage and peppers, sheet pan meals, and other cooked dishes where sliced onions are part of the recipe.

Keep in mind that frozen onions may release a little extra moisture as they cook. If you are sautéing them, cook for a few extra minutes to let the moisture evaporate before adding the rest of your ingredients.

Frozen onions are not the best choice for fresh uses, such as salads, sandwiches, burgers, or toppings, because they will be soft once thawed. For those recipes, fresh onions will give you the best flavor and texture.

Tips for Freezing Onions

Freezing onions is easy, but these tips will help keep them more useful for everyday cooking:

• Freeze onions in recipe-sized portions: If you often use 1/2 cup or 1 cup of chopped onion in recipes, freeze some in those amounts so they are easy to grab later.
• Freeze diced and sliced onions separately: Label each package clearly so you can find the right cut for the recipe you are making.
• Use freezer-safe packaging: Regular storage bags are not as thick as freezer bags and may not protect the onions as well from freezer burn.
• Remove as much air as possible: Press excess air out of freezer bags before sealing, or use freezer-safe containers that fit the amount of onions closely.
• Double bag if needed: Onions have a strong aroma, so double bagging can help prevent the smell from spreading in the freezer.
• Use frozen onions without thawing: Add them directly to cooked recipes for the best texture.
• Expect extra moisture: Frozen onions may release liquid as they cook, so allow a little extra cooking time when sautéing.
• Keep your freezer organized: Store onions with other vegetables or meal-prep ingredients, and use the oldest packages first.
• Remove onion odor from hands and cutting boards: After chopping onions, wash your hands, knife, and cutting board with warm, soapy water. For lingering odors, rub your hands or cutting board with a cut lemon, a paste of baking soda and water, or a little vinegar, then rinse well.

Frequently Asked Questions About Freezing Onions

Freezing onions is simple, but it is normal to have questions about texture, storage, odor, and how to use them later. Here are some common questions about freezing onions and what to expect once they are in your freezer.

Keep Your Onion Harvest Working for You

Freezing onions is an easy way to preserve extras from the garden, bulk purchases, or storage onions that need to be used up. Once they are chopped, packaged, and tucked into the freezer, they are ready to add to all kinds of cooked meals.

Whether you freeze diced onions for soups, stews, sauces, and casseroles, sliced onions for fajitas and stir-fries, or leftover onion pieces from meal prep, this simple habit can help reduce waste and make everyday cooking easier.

If you grow your own onions, be sure to start with healthy, well-cured bulbs for the best storage life. You may also enjoy learning how to grow onions, how to harvest, cure, and store onions, and other ways to preserve onions so you can make the most of your harvest.