How low temperatures can 2 week old plants survive?

I am starting my plants out indoors and can't seem to find out how low of a temperature 2-4 week out plants can survive(other than frost). The reason I ask is I am between 35-40 Latitude and our last frost day is around the second week of May, but there are people planting flowers last week or so that are still alive(been in 70's all week, supposed to get 85 today and lows of 45!),we will probably only get 1-2 light frost between now and then.Would 2 week old plants survive if it got down to 30-35 overnite?month old ones? I'd like to put my plants in the ground in a week or two to maximize my yield but don't know if I should risk it, i only got 2 plants of each strain and I really wanna try them all, most of my strains are sativa or sativa dominant if that makes a difference.

It's all upon the genetics of the plant.. Some can handle the cold some will die with just a tiny amount. If they do live, there gunna be soo much in shock they'll probably hermie.

agree^ if they live, they aren't going to like you much. Some things i do are.. put something over top of the plant to stop any frost of reaching your plant (i use a trellis with plastic on it) and if they are big enough i place a thick towel around the root, for a little more warmth. I usually do this late in the season, i like to grow into Nov. (plants are usually done here in Oct.) to get the trichomes as amber as i can.