How Long Do Onions Last?
By James OkaforReviewed 2026-01-01
Whole onions keep 1–2 months in a cool, dark, dry, ventilated spot; cut onions last 7–10 days in the fridge. Never store onions with potatoes — they spoil each other. Freeze chopped onions for 3–6 months. Sprouted onions are fine; use them quickly.
Onions are the kitchen's long-distance runner among vegetables — a good storage onion will wait for you for two months. The catch is that onions are the opposite of potatoes in almost every way, and storing them the same way is the most common mistake in the produce aisle.
How long onions last
| Storage method | Duration | Best practice |
|---|---|---|
| Pantry (whole) | 1–2 months | Mesh bag or open basket, dry and ventilated |
| Pantry (sweet onions) | 2–4 weeks | Sweeter onions hold more moisture |
| Fridge (cut) | 7–10 days | Sealed container; peel and chop first |
| Freezer (chopped) | 3–6 months | Use straight from the freezer for cooking |
Storage conditions for onions
Whole onions want a cool, dark, dry, and ventilated spot — a mesh bag, open basket, or single layer in a cabinet. Light makes them sprout and green, moisture makes them rot, and a sealed plastic bag traps exactly that moisture. Sweet onions like Vidalia and Walla Walla are the exception: they're juicier, so they spoil faster and some cooks refrigerate them.
The golden rule is separation. Onions and potatoes actively spoil each other — onions release moisture and potatoes release ethylene gas, and each accelerates the other's decay. Store them in different cabinets, or at least different baskets.
Storage tip
For cut onions, peel and chop the entire onion and store the pieces in a sealed container. A lone half-onion wrapped in plastic dries out and goes limp fast; chopped pieces in an airtight container hold up for the full 7–10 days. ::
How to tell onions are past their prime
Look for soft, mushy spots, a strong sweet-rotten smell, visible mold (usually black or gray), or green sprouts. Sprouted onions are fine to eat — trim the shoots — but use them fast, since the sprout steals flavor and crunch. An onion that has gone soft, smells fermented, or shows mold goes in the compost.
Freezing onions
Chopped onions freeze beautifully. Peel, chop, and freeze in zip-top bags for 3–6 months, and use them straight from the freezer in any cooked dish — no thawing needed. Frozen onions lose their crisp bite, so save them for soups, stews, sauces, and sautés rather than salads. They're a huge convenience: chop a batch on prep day, freeze it flat, and break off what you need.
See how to freeze vegetables and the refrigerator storage guide for the step-by-step methods.
Frequently asked questions
How long do whole onions last?
Whole onions keep 1–2 months in a cool, dark, dry, ventilated place — a pantry or cabinet, in a mesh bag or open basket, never plastic. Sweet onions like Vidalia last less (2–4 weeks) because they hold more moisture. Warmer, brighter spots shrink the window fast.
How long do cut onions last in the fridge?
Cut onions keep 7–10 days in the refrigerator in a sealed container or bag. They last longest if you peel and chop the whole onion and store the pieces, since a cut, half-peeled onion dries out. If any cut onion develops a slimy layer or off smell, trim or discard it.
Should onions be stored with potatoes?
No. Onions and potatoes spoil each other faster when stored together — onions give off moisture and potatoes release ethylene gas, and each accelerates the other's sprouting and rot. Store them in separate places: potatoes in the dark and cool, onions in a dry, ventilated spot.
Can you freeze onions?
Yes. Peel, chop, and freeze onions in zip-top bags for 3–6 months. Frozen onions are perfect for cooking — soups, stews, sauces, and sautés — and you can use them straight from the freezer without thawing. They lose their crispness, so don't use frozen onions raw on salads.
Why do onions sprout and turn green?
Onions sprout when they're exposed to light and warmth — light especially, which is why a visible bowl of onions grows green shoots. Sprouting is not dangerous, but it uses the onion's stored energy and can make it taste bitter and lose crunch. Use sprouted onions quickly, trimming the shoots.
Sources
Shelf-life and temperature claims on this page are cited from tier-1 food-safety authorities. Always confirm current guidance before relying on dated information.
Written by
Senior food storage writer
Writer covering food storage shelf life, storage methods, and kitchen organization.
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