High tunnels, also known as hoop houses, are greenhouse-like structures made of metal frames covered with a layer of clear plastic that provide a protected environment for growing crops (Kaiser and Ernst, 2021).

They are similar to greenhouses in their appearance and function, and primarily used for growing vegetables, cut flowers, and small fruit crops.

The main purpose of the high tunnel is to extend the growing season for various crops such as leafy greens, tomatoes, and peppers. By protecting plants from harsh weather (such as wind and frost), high tunnels create a more controlled environment which can lead to an earlier start in the spring and a later end in the fall compared to field cultivation (USDA-NRSC, 2024).

Unlike greenhouses, high tunnels do not have climate control systems such as heating or automated ventilation. High tunnels rely on solar radiation for heat and ventilation which can be achieved by rolling up the sides of the tunnel or opening end doors.

Choose a site that is level or slightly sloped for proper drainage.

Avoid shaded areas, especially those shaded during the winter months. A south-facing orientation often provides optimal sunlight exposure.

Choose a site with fertile and well-drained soil. Conduct soil tests to assess nutrient levels, pH, and texture.

Proximity to a reliable water source is required all year round.

High tunnel cost (excluding labor): $1.50-$5.00 per square foot, depending on materials.

Medium-sized high tunnel (30'×96'): Estimated cost $4,320-$14,400.

Simple drip irrigation can cost $300 and over.

Advanced systems: Over $1,000.

Annual maintenance (plastic covering, irrigation repairs): $100-$1,000.