Squash is a warm-season crop, very tender to frost and light freezes. Squash can be grown almost anywhere, as the vines develop quickly. Harvest begins in 2 months. Winter squash requires a longer growing season and more garden space for sprawling plants. placed 3 feet apart each way; plant 6 or 7 seeds per hill and thin to the 3 strongest seedlings when the plants are 3 inches high. How to Grow Organic Squash & Zucchini from Seed