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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.
Frozen chopped onions will have a softer texture once thawed and are best used in cooked dishes. How long do chopped onions last in the freezer? Properly stored, they will maintain best quality for about 6 to 8 months, but will remain safe beyond that time.