Building a cold frame can help winter vegetables survive cold, frosty nights. I put together a very makeshift cold frame using straw bales and floating row covers. I have arugula, swiss chard, beets and lettuce growing this winter. The straw-bale cold frame is working great. This week we had a night of 19 degrees and several nights in the 20′s. I checked everything today and harvested arugula, beets and beet greens. These beets were not in the cold frame and 0ne beet still had frost on it. The plants are looking a little wilted but I think they will perk up on the next warmer day. The white in the arugula picture is the floating row cover, used for protection from freezing which I pulled back to cut some arugula.