Your potatoes should be stored in a cool, dark, dry place, such as a pantry or cupboard.
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.
How should you store onions?
THE BOTTOM LINE: Store leftover halved onions wrapped tightly in plastic wrap or in a zipper-lock bag or airtight container in the fridge for up to two weeks. Be sure to use the stored onions only in cooked applications. Stored properly, a leftover halved onion works fine if cooked but not raw.
How long can you store onions?
Onions will keep for 1-2 months in the summer and up to 6 months in the winter, since the conditions are less humid and cooler. If cut and peeled, they will last in a sealed plastic bag in the fridge for a few days. Shallots will keep for a month at room temperature and for 2 weeks if you store them in the fridge.
Should onions be refrigerated?
Instead, keep storage onions, such as red or white onions, in the mesh bag they came in, or in a bowl in a cool, dry, ventilated spot in your pantry. The USDA recommends you store them at 45 to 50ºF (just above refrigeration level), but if you can’t find such a cool place, they’ll keep for a week at room temperature.