Hi everybody

My first post on this forum, i need some advices for the winter dormancy of ly Sarracenia, i keem them outside all the year but in this period the temperatures are going below 0 and the pots are totaly freezing... i know that some cold is not hurting them but i'm scared that they could die for dehydratation, should i bring them inside in a cold and lightless room? Please need help. Thanks