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Old February 1, 2018   #111
BigVanVader's Avatar
Join Date: Mar 2014
Location: Greenville, South Carolina
Posts: 3,049

I've found mine does NOT get colder when I leave the ends open. I am also on a slope so the cold air may flow down and away from the coldframe. Either way I keep it opened and use row cover and I still have lettuce alive after weeks in the teens.
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