The winters vary around here, NW Arkansas. This year there were three or four days in a row where the temp was around 0 F at night, but most winter days around here get above freezing during the day. One of the keys to these tiny greenhouses is that I place large rocks in the beds to collect solar, and then that radiation is shared with the plants during the night.
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well last night here we had a lower of minus 21 celius -6 or so f i think.