Generally speaking, those growing winter squash need to be patient gardeners, with fruits not maturing until 100 days after transplanting. It's no wonder then, that 'Early Butternut' squash was named an AAS winner, due in part to its relatively fast growth, producing mature fruits in under 90 days. Firm sweet flesh, a small seed cavity, and fruits averaging two pounds each that store well also contribute to its overall appeal. This squash will need room to grow however, with lots of sun, so place plants at least two feet apart in rows four to six feet wide. Fruits are ready to harvest when the stems dry and/or the rind is hard enough that you can't dent it with a fingernail.