Building and Using Cold Frames Author:Charles Siegchrist Involving a day's work with readily available materials and simple hand tools, construction of a cold frame is quick and economical. With a cold frame you can stretch the growing season for salad greens up to 3 months in short season areas. In addition to expanding the length of the growing season, a cold frame can increase the types of produc... more »e you can grow. This book tells you how to build a cold frame and how to use a cold frame.« less