Thread: how cool?
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Old May 16, 2017   #5
jmsieglaff
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Join Date: Jan 2014
Location: Southern WI
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Agreed on the advice about 40s being fine. Mine often experience 40s in the cold frame where they live from later April until plant out time--usually May 10-15 for me. I have a polystyrene cover I built for my cold frame that I put on nights in the 30s and that keeps the temperature up (retains heat from the 10 or so 1/2 gallon milk jugs that spray painted black and filled with water).
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