First Grow

We had a bad snow storm the past week and had some pretty low temps anywhere from 1°F-29°F, my heater had gotten turned off throughout the night before yesterday, with Lows of 22°F and Highs of 32°F in the tent, I came back to see the plants looking beat up. Not sure what caused the leaves to do that but i don't believe It had anything to do with watering because I had watered them the about 12 in the afternoon before they froze, I waited for the plants to warm up before I gave them water, they haven't improved the leaves are starting to turn a yellow color and they look like little claws