I May Have Lost All New Seedlings

OK so I left my seedlings outside last night and the temperature dropped briefly to 39 degrees.
Ugh. Here's a germination chart that doesn't shed much hope on the future of these seedlings.

I am banking on a hunch that the seeds will do OK, praying the ground they are in stayed warm enough??

We'll see.
I should probably get going on some more new plantings.