High Tunnels are an increasingly popular trend for growers and a proven technology for crop production. The term “high tunnel” is a loosely defined phrase for heighted tunnels greater than 8 ft. high. And it is the difference between a High Tunnel and a regular free-standing greenhouse.All high tunnels are designed for heavy snow and wind loads with extra support for crops. All greenhouses are pre-drilled, pre-cut, include all hardware and assemble very easily. Many different options available for cooling, doors and end wall design, Crop support systems available.