I have done this recently with my Caladium, both times I did not water at all during dormancy, and the new growth shoot appeared without water in Spring. The first time I kept it inside at my office (very dry AC environment), so nothing below 65. This winter I put it in my unheated greenhouse where temps can get down below 50 and it was fine also.

I thought you' diet a kick out my caladium story. I planted two plants last year in a new bed under a tree along with ferns & I patients. Everything but the ferns died within weeks. I cleaned up everything out and sent the lot to the compost pile. We eventually figured out that tree was starved for everything - previous owner neglected everything. Fixed that so everything growing great under it this year. But I didn't plant any more caladiums. Hubby informed me yesterday that one of the caladiums is growing gloriously in one of the compost piles! I guess I better go move it to a proper bed!

There should be places where the plants should sprout next year. I would not be concerned

A frost for a short time would not burn the bulbs. The soil keeps that insulated. Dig your bulbs and rinse them with a hose and cut off all the stems. Place them in a large bowl or an old cookie sheet works great. Good bulbs should feel very hard. Throw out any which feels the least bit spongy. Do not pile them deep in a small container, the ones on the bottom will mildew. Place them in an area which has good air circulation for about 2 weeks. Then store them in your house inside a paper bag until next Spring's planting time. Do not put them in a refrigerator. It so happens I just dug mine up last week and dried them. I have used the same bulbs for 3 years now. I am located in zone 7, Southside Virginia. Good luck with yours and happy gardening.