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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.
Keeping most onions out of the fridge works, but here are a few caveats: 1  Cut onions DO need to be refrigerated. 2  Peeled onions DO need to be refrigerated. 3  Refrigerate sweet or mild onions that have a high water content. This will extend their shelf life.