Winter Squash is an annual fruit representing several squash species within the genus Cucurbita. It differs from summer squash in that it is harvested and eaten in the mature fruit stage when the seeds within have matured fully and the skin has hardened into a tough rind. At this stage, most varieties of this fruit can be stored for use during the winter.
You'll see best storage results when you stash squash in a cool, dry spot. For most winter squash,store at 50º to 55º F with relative humidity of 60 to 70 percent. The one exception, again, is Acorn squash, which should be kept at temperatures less than 55. Higher temperatures cause the flesh to become stringy.