Cold Frames and High Tunnels

Cold Frames and High Tunnels are simple in construction, typically heated by the sun filtering through the poly film covering....offering protection from rain, wind, insects, birds etc. As a practical season extender for early higher crop yields, a cold frame or high tunnel greenhouse is not only inexpensive, but also provides supplemental growing space for big projects. In many instances, cold frames and high tunnel structures may be upgraded with thermostatic controlled ventilation systems, shade cloth, heating systems.