North Carolina Cooperative Extension, Season Extension
Overview of season extension. Includes list of appropriate over-wintering crops, biodegradable mulches, row coverings, high tunnels, etc. Good resource but it’s written for North Carolina temperatures so keep that in mind.
University of Kentucky Cooperative Extension Service, Season Extension Tools and Techniques
Benefits of season extension, low tunnels, high tunnels, etc.
University of Tennessee, Production Planning: Growing More out of your Season
Information on season extension in powerpoint form, lots of pictures.
American Society for Plasticulture
Information on plasticulture and publications for sale. Also has powerpoint presentations.
Penn State Center for Plasticulture
Information on plastic technologies, instruction manuals, photos, and more.
Washington State University, Vegetable Research and Extension
Covers uses of plastic for agriculture and season extension. Information on plastic recycling, hoophouses, plastic as mulch, high and low tunnels, and greenhouses. Also includes instruction manuals and construction plans.
A number of articles on high tunnels, including information about vegetables, fruits, and flowers used in them, construction, and examples of growers using high tunnels. Also has a list of online resources.
Design and Construction of the Penn State High Tunnel
Plans and constructions for a high tunnel from Penn State. Design was developed, researched, and patented by Penn State.
University of Kentucky Department of Horticulture, How to Build a High Tunnel
Plans to build a high tunnel. Includes lists and costs of materials, pictures, and instructions.