Can’t answer your question but got to say I feel for you. To get that far and have Mother Nature stomp on you sucks. Minus 11 here last night and have been worried about your situation. Hope you get an answer and hope they have a chance.
I have been waiting to lose power in TX too, but I am safe so far. Had a plan to move them from garage to inside if we lost power. My hunch is that slowly bringing the temp up will be better than exposing them to high dry heat to warm them quickly. Rapid fixes usually cause another problem…
I believe you get higher concentrations of CBD and CBN later in more mature buds. I was curious to grow high CBD specimens for more of the medicinal properties. There is still lots of research being done on CBN.
That is a real shame @TheScot. I, too, live by the mantra, “It is what it is.”
I think I would be more concerned with whether or not the plants themselves froze solid. And I would be concerned about humidity. When your plants thawed out, were you able to bring the humidity in your grow tent back to a reasonable level? Did they still get any light?
If your plants did not freeze, and you were able to bring them back to normal temps, see if they recover. I regularly expose my plants too cold temperatures. But I also make sure they keep getting enough light.
They might recover. If they don’t, just harvest and get them down to an rh in the 40-50% range and watch out for mold from moisture.