This was a question I received a number of times at this week's Indiana Green Expo. The short answer is, I don't know. I suspect the snow cover greatly improved chances of bermudagrass survival. If you did not have snow cover, it may be a different story.
Do you want to determine what you have as of today? HERE is a link of an article from Grady Miller from 2010. Pay careful attention to the end of the article where Grady explains pulling plugs to determine bermudagrass health to date. Thanks to James Bergdoll, Turf Manager/Maintenance Superintendent at the Elizabethtown Sports Park for providing the initial link to this great information.
Let's hope for a warmer rest of the winter.
Go to j-dturf.com to learn more about J&D Turf.