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What night-time temperatures are too cold for "tender plants" such as tomatoes, squashes, annual bedding plants, etc.?
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Generally, anything close to freezing, which is 32 degrees. That doesn't take into account other variables such as hardening off plants prior to transplant.
Many ways of dealing with cold temperatures like wall-o-waters, floating row covers, high tunnels which are all season extenders to deal with freezing temperatures.
Here is a table with vegetables and average planting dates to avoid freezing of warm season vegetables http://www.co.utah.ut.us/dept/exten/Data/vegetableutah.pdf
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