Certified GKH Gardening Expert
There are a few varieties that can withstand those temperatures with special care, and mulching. Most will not come back, though. The general consensus is that zones 8 and above are ideal for their return, though there are certainly cultivars that will go much lower.
Here is an article for their, general, care: https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/growing-elephant-ear-plants.htm