Since I never made it this far last year, I don't know what I would have done with out the cold frame it works great.I was afraid that Hardening off the plants would be another stumbling block for me.The cold frame is a very small scale spin off AJ's Greenhouse. The plants really love being outside. The nights have not been to cold I put a 250w heat lamp in there a couple of nights but temps have not dropped below 45 outside. Temps stay around 62 at night and 72-80 during the day inside the cold frame