Setting out some broccoli plants WAAAY to early

I don't know what I was thinking, exactly. I guess I was curious what would happen if a put a couple brassicas out under the hoop houses. After all, there's a ton of lettuce and kale in there that sprouted in January, during the coldest month of the winter! Well I put a couple of the smaller ones out there, and a couple days later (today) I went out and checked on them. They're completely dead! Wilted to the ground! We had some really cold nights the last couple nights, and chances are, it got up to almost 90 degrees in the hoop houses today because of the sun. Lesson learned - just be patient!