Also called high hoops or hoop houses, these are temporary, covered structures that extend the growing season. They are constructed in the field with materials like translucent plastic or polyethylene fabric in order to protect crops from adverse weather (rain, wind, cool or warm temperatures) and, in some cases, pests.
Example of High Tunnels:
High tunnels are utilized in similar way as a green house. Vegetable and fruit production can be maximized when grown in high tunnels as they are being protected from extreme weathers which extends the season of growth.