Peeled onions can be stored in the fridge for up to two weeks, while diced or sliced onions will only last for 7–10 days (4). Avoid storing whole, unpeeled onions in the fridge, as they easily absorb moisture. Doing so may cause them to become mushy and spoil faster.
Once an onion has been peeled, it is best stored in the fridge to avoid contamination. Halved, sliced, or chopped raw onions should also be refrigerated, in an airtight container or resealable plastic bag. They will last seven to 10 days when stored this way.
Keep storage onions in a cool, dark, and dry place. Moisture and light lead to mold (ew) and sprouting (annoying, though not a deal-breaker), so stow your storage onions (red, yellow, and white as well as shallots and the diminutive pearl and cippoline) in a dry, well-ventilated basket, bin, or large bowl.
Now when it comes to fresh onions, like spring onions with their green tops attached, or sweet onions, like Vidalias and Walla Wallas, refrigeration is your best bet for long-term storage.
Generally speaking, onions should last between seven and ten days in your refrigerator and six to eight months in your freezer, but all of that can depend on how they are stored.
According to the USDA, whole peeled onions have a shelf life of 10-14 days refrigerated, while diced and sliced onions typically last 7-10 days refrigerated. It's recommended to store cut onions in a sealed container or plastic bag while in the refrigerator.
Any moisture that gets trapped around the onions will promote early spoilage, so good air circulation is key, as is removing thm from plastic produce bags, if you use those to gather them at the store. Place the container in a dry, dark spot, like in the back of your pantry or inside a cabinet.
Don't wash your onions or garlic before you store them. Keep them very dry. While in Storage Check and cull them often to make sure the onions and garlic are not sprouting or developing soft spots. Remove and eat any damaged bulbs.
Don't store potatoes in the fridge.
Raw potatoes have lots of starches, and the cold temperatures can turn the starches into sugars. This can make your potatoes turn sweeter and darker during cooking.
Use a storage container that is well-ventilated, such as a crate, a cardboard box with holes punched in it, or any container that will allow any excess moisture to evaporate. Keep the container covered to block light and prevent your spuds from spouting.
Do not wrap onions in plastic or store in plastic bags. A lack of air circulation will reduce shelf life. Onions should feel firm and dry, be free of gray or black mold, and should not have any visible sprouting.
Never store onions in a plastic bag or airtight containers. Onions need good air circulation to stay fresh. Otherwise, they may rot quickly and be more susceptible to sprouting.
The best place to keep whole onions is somewhere dark, cool, dry, and well-ventilated. A perforated basket or bin in a kitchen cupboard checks all the boxes and would be an ideal location in which to store onions.
Onions and garlic can last up to 3-6 months when stored properly. Keep onions and garlic in a basket or paper bag where air can circulate. Store in a cool, dark place for up to 3-6 months. Never keep these items in sealed plastic as it will quickly cause spoilage.
Also, lack of air circulation will cause onions to spoil, as will storing them near potatoes, which give off moisture and gas that can cause onions to spoil quickly.
What you don't want is to have your potatoes and onions in close proximity, as gases from the onions can hasten sprouting in potatoes.
No—potatoes and onions should be stored far apart from each other. Onions produce ethylene gas, a plant hormone that encourages fruits and vegetables to ripen. When potatoes are exposed to ethylene in storage, they're more likely to rot, spoil, or sprout before you use them.
Best practice is to store eggs in the fridge; that way the temperature is always at a constant and your eggs will be fresher!