A high tunnel is a poly-covered frame structure that provides climate control and protects crops from rainfall and winds, allowing farmers to extend the growing season earlier and later into the year. High tunnels offer advantages like year-round production, higher quality crops, fewer pests and diseases, less weeds, and consistent cash flow. Farmers can use high tunnels to start selling crops earlier at farmers markets or to continue selling into the winter. There are different options for high tunnel structures including low-cost PVC, scrap lumber, bent steel, and movable designs.