How cold of temperatures can onions tolerate? This is my first time growing onions and it is getting down to 27f tonight. Do I need to cover them or can they handle this?
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Pretty darn cold. I think they will be fine at 27 degrees. You may have some frostbite on the tops of the green but they will grow out of it quickly.
It all depends. Are they sets you recently planted? Are they seedlings that you started in the house? How tall are the tops? If you've recently planted sets, they should be fine down to 20*, according to the literature. if they are seedlings that you've recently set out, I'd plan to cover them.