^ âeucatastropheâ (US) / âeucatastropheâ (UK) in Oxford Dictionaries, Oxford University Press.
A: Chopped or sliced onions can be stored in a sealed container in your refrigerator at the proper temperature of 40Â°F or below for 7 to 10 days (Source: USDA). For pre-cut fresh or frozen products, always use and follow manufactures use by dates.
Onions can last for several weeks (if not months) without compromising their taste or nutritional value. However, you must be sure to store them in a cool, dry, well-ventilated place. Once you cut an onion, wrap whatever portion you donât use in plastic wrap, and put it in the refrigerator. It will keep about 4 days.