Mine are in the ground, which helps. If yours are in pots, you can bring them in, even to a shed. I had just one in a pot (a little mutant I didn't bother to transplant) and I brought her into a barn. If you can't bring en in, insulate the shit out of them. If you can cover them, do it. I would if mine were smaller. I considered cutting the tops off them and covering but am banking on their hardiness.
If they do get frost bit, it should only be leaf damage. If the damage is bad, wait until the heat of the day and gently harvest and trim. The bud should be fine. If they bear tonight's frost, they will have at least a couple of week's nice weather as a reward. Still, the process is very nerve-wracking ...