Frost strikes a blow!

[creister]

Yesterday, I put my seedlings out in their outdoor shelter to start them on being hardened off. I have used the shelter set up for about the last 3 or 4 years with good success against frost.

Not last night. Even though the temp only got to 36, several ended up with frost damage. I am not sure why that happened. Some look like they will recover, others, it remains to be seen. Will plants with leaves that appear to be dead from frost recover? The stems on all seem to still be strong. I thought I read that frost damaged plants are able to recover sometimes. If they do, will they still produce fruit?