Parsnips are such a sweet, delicious root vegetable that gets me through the winter months. Direct sow after danger of frost is past. They will be ready in 115 days from the time the seeds emerge. Parsnips get SO MUCH SWEETER in cold weather, so time your planting so they are harvested in mid-late fall. Many folks cover them with a deep layer of straw and pull them all winter long. They take a while, but they are so worth it!.