Winter squash will last up to a month in a cool (50 to 55 F) storage area, but only about two weeks in the refrigerator. Ideally, only cut or cooked acorn squash should be refrigerated; they will suffer chill damage at temperatures below 50 F. Dry, hot air will cause loss of moisture, resulting in a shorter shelf life. Squash with a bit of the stem still intact will help slow down moisture loss.

Once cut, wrap raw pieces in plastic wrap, refrigerate, and use within four days. Cooked acorn squash can be sealed and refrigerated up to four days.

Before freezing, acorn squash must be cooked. Cook squash and remove the pulp from the skin. You can leave it in chunks or mash it. Place in airtight containers and freeze up to 10 to 12 months.