How cold is too cold for the plants in my garden?

My boyfriend and I planted a few plants today because it was 75 degrees. I am in Missouri, and it tends to get cold and then warm and then cold again all in one week. This week, the days will be in the 50's, but at night, it could get down in the high 20's. The main plants we are concerned with are the rose bush, a lilac bush, dwarf carnations and some tomato plants. If this is too cold, what is the best way to help protect them?

How cold is too cold for the plants in my garden?
Tomato plants should be put in the ground after the last frost, they are so, so delicate, cover them at night. Maybe cover the rest also just to protect them, if they are not too big.


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You are too funny, it's so easy to plant stuff in the garden as soon as we get one nice day! I have had the urge with the mild winter we are having, but resisted. But t-storms should be okay, maybe rig up some sort of tarp tent so the rains do not smush the plants and flood them out.
Reply:If it gets down in the 20's at night your carnations and tomatoes will be doomed from frost damage unless you cover them up with something like a plastic sheet. If you are going to get rain and winds tonight at least these plants will be safe from any frost tonight, but if the winds are high enough they may suffer some wind damage since they are newly planted. The thunder and lighting is not an issue unless they are hit directly by lighting which is probably very unlikely.



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