Dracaena Massangeana (Corn Plant freeze)
Left our Corn plant outside too long into the fall and it froze. as seen on other sites / videos, advice was trim back all leaves and leave in bright inside area, not to water for awhile. See pics. Now thinking we need to actually trim the stems down, but not sure how far. The tops are all dried out and brittle.




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In the UK, they would be treated as indoor plants and only put outside in a shady spot during the warmer summer months.
Try it and see - best of luck
You purchased in June, a good nursery should have had information on the label regarding it's care.
I would normally suggest returning a plant that fails in such a short time however it has been outside in a very cold November. Sadly plants in pots are even more vunerable than those in the ground and your porch may have also been just too cold.
Another way is to wait and watch.
We are Richmond VA
If you work your way down the cracking bark to an area where it is firm try the scratch test. I cannot advise on whether or not you should cut back to where there are signs of growth unless it really starts to rot, my thoughts would be to carry out any pruning that is absolutely necessary in spring.
Still worth checking the rootball ( the pot as you say is rather small ) to see whether it has been affected beyond help. If you see signs of life in one stem, then your best bet is to clean it up, keep it warm and see what happens