How to Store Leeks So They Stay Fresh for Weeks

Leeks are a fairly ubiquitous vegetable, easily found at the grocery store or farmers market. They have tall stalks with dark green tops and tender white roots, and like shallots, onions, and garlic, they are a type of allium. In terms of flavor, they are sweet and mild, especially compared to the bold flavor of garlic and the astringent aroma of many onion varieties. But, when it comes to how to store leeks, they are much more similar to a bunch of scallions than a bag of onions. While onions thrive in a cool, dark environment, leeks require refrigeration to stay fresh. 

We spoke with two culinary experts to learn more about storing leeks safely, so they are ready for whatever recipe you need them for, whether it’s a comforting braised leek dish or a simple soup.

How to Store Whole Leeks

Our experts, Michael Handal, chef and brand ambassador at the Institute of Culinary Education, and Mary Anne Roshni Amalaradjou, associate professor of food microbiology at the University of Connecticut, agree that storing leeks in their whole form is the preferred option. Keeping leeks whole is the best way to ensure they retain as much of their natural moisture and flavor as possible, says Handal. Any obvious surface dirt can be rinsed under cold water before storing but there is no need to wash them thoroughly—and be sure to thoroughly dry the leeks before storing. 

Refrigerating leeks whole, rather than sliced, is the safest option, says Amalaradjou. “When a leek is left whole, its outer layers protect the inside from bacteria and slow down spoilage,” she explains. Once you slice a leek, the moist inner parts are exposed, which makes it easier for bacteria to grow. Because of this, food safety guidance recommends keeping vegetables (not just leeks) whole until you are ready to use them. Keep them in the crisper drawer to make them last even longer, since it controls the humidity and air flow in the refrigerator.

The Best Storage Method for Whole Leeks

The best way to store whole leeks in the refrigerator is in a loose plastic bag or perforated produce container—line it with a few paper towels to help absorb excess moisture.

If you have a large enough container and sufficient refrigerator space (leeks can be pretty long), keep the roots and dark green tops intact when storing. Keeping the whole leek intact will have an impact on the overall shelf life. If you don't have space, then remove the tops and store them separately. 

How long whole leeks last: Whole leeks can last several weeks before any spoilage occurs if stored correctly.

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How to Store Cut or Sliced Leeks

While storing leeks whole is optimal, they can be prepped ahead of time. Pre-slicing can be a great way to reduce prep time. If you slice them, Amalaradjou says that the leeks need to be placed in the refrigerator right away. “Store them in a clean, airtight container or sealed bag and make sure they are dry before storing,” she says. This helps slow down spoilage and keeps bacteria from growing too quickly.

Handal also emphasizes the importance of proper storage techniques for sliced leeks, noting that they need to be kept covered to prevent them from drying out. And he says that if you have a vacuum sealer, it is a great option for preserving cut leeks for longer. “Pre-cut leeks can be vacuum-sealed and held for up to two weeks, if needed,” he notes.

Storing cut leeks in water in the refrigerator is not recommended, though it can be a good way to keep leeks from drying out during prep.

How long sliced leeks last: Sliced leeks should be used by three to five days after they were cut, says Amalaradjou.

Freezing Leeks

Leeks can be frozen, but they won’t have the same texture after freezing. Handal says that the change in texture may be less noticeable depending on how you plan to use the leeks. For example, when using leeks as aromatics for stock, frozen is just fine. “Two to four-inch sections of leeks can be frozen and added straight to the stock pot with other elements,” he says. However, frozen leeks, whether pre-cut or left whole, thawed or kept frozen, will express more moisture than fresh ones, so they should not be used for sautéeing, roasting, braising, etc. 

How long frozen leeks last: Frozen leeks will last up to 3 months.

Signs That Leeks Have Gone Bad

There are a few things to look for to know if leeks have spoiled. They are also good things to keep in mind when you're shopping for leeks: 

• Soft spots: Good leeks should be firm, so if you notice soft spots, that’s a sign the leeks are beginning to spoil. 
• Slimy texture: The outside of leeks should feel dry, so if you notice any sliminess, peel away those layers. If the slimy texture continues after you’ve removed a few layers, compost the leek. 
• Yellowing: The color of leeks should vary in an ombre pattern from deep green at the tops to bright white at the roots. Any bruising or yellow spots means they are past their prime. 
• Mold: Mold is a clear indicator that leeks are no longer safe to eat.