I still haven't pulled my cannas. We had night temps down to the 20's for a couple of weeks. Is the damage done?
I think you could be done in.Since canna grows along rhizones you won't know until spring now.Keep fingers crossed.
Has the soil frozen yet? If not, you just might get lucky and be able to save them. Dig them up and see what happens.
they are prob fine, although after t his weekend, not sure.
I would dig them next week when it warms up a bit (supposedly).
I cut the tops and laid those over the bulbs and added some leafs to the top of that pile. Not sure if that will work so I pulled some of them. I would advise covering them right away until you can around get to lifting them.