How Cold is Too Cold for Seedlings

Question

I have started seeds and seedlings out in my plastic wrapped screened in porch. Tonight it is suppose to be 40 degrees. Is that too cold to leave them out in? I live in Minnesota. How cold is too cold for just planted seeds and seedlings?

Answer 1

Most seeds require warm temperatures to germinate, usually at least 55-60 degree F., depending on the plant being grown. While 40 degree temps will not likely hurt the seedlings (as they're protected), it could inhibit the germination of the other seed plants.