Although I had some advance warning that I might have frost overnight last night, these ragged veggie transplants did not inspire enough enthusiasm on my part to attempt to protect them, which would have been a fair amount of work at the far corner of my garden.
Frost does not need to freeze a leaf in order to damage it. Needle-like ice crystals form on the exterior surfaces (upper and lower) of the leaf, and pierce the lamina. As soon as the sun comes out, the damaged leaf is promptly toasted.
I'll watch these for a few days, and if need be, purchase tomato starts, and directly seed more cukes and squash.
I did take some care with my potted Big Beef tomato, on the porch. I made sure the large pot was well watered, and placed two 1-gallon jugs of water beside it. When I retired for the night, I turned on an oscillating fan on the porch, to keep air-circulating. That tomato was nipped on a few leaf tips, but otherwise looks healthy.
Bob