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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.
For example, if you slice your onions on a cutting board that you also used to cut raw chicken, any bacteria from the chicken juice will be transferred to the onion. Using Precut Onions. Chopped or sliced onions, properly stored in the refrigerator, will keep for seven to 10 days, according to the National Onion Association.