Parsnip roots can be used in soups, stews, and side dishes. (Learn more about cooking and serving parsnips, click here.) The parsnip is a root crop that can be planted in spring and autumn in all regions and winter in mild-winter regions. Parsnips require 95 to 120 days to mature and reach harvest. The parsnip root is most tasty after it has come through freezing temperatures. Planting Calendar. Parsnips require as many as 120 days to reach maturity and harvest. Freezing weath
