I need to learn more about cold frames. I would like to use them to extend my growing season. I have covered some unharvested root vegetables with straw and let the snow cover it and was then able to harvest some more in the spring. This past year was my first year trying it. Was quite successful with the turnips and carrots. Would love to eventually get a berry patch but I am not sure if all the wildlife here would allow the fruit to ripen before they consumed it.