With a cold frame you can start growing vegetables and flowers significantly earlier in the year. The walls and lid of the cold frame are made of polycarbonate, are translucent and UV-resistant. As a result, these cold frames are very robust and weatherproof and have an extremely long life. The cold frame has no bottom and can therefore be easily placed around the young plants. The four large, vertically hinged lids allow easy access. In winter the double cold frame protects the seedlings against frost, in summer it extends the harvest time.cold frame for turtles? Sure. Of course, the cold frame is also suitable as a shelter against rain and cold for turtles.