Is this a grape vine?

I just moved into a new house. In the back yard is a wooden trellis. It has something growing up it. I could not think of anything else but a grape vine. There are no leaves on it but in march in alabama there arent leaves on too many things anyways. How can I tell if it is still alive? Should I trim it? It is pretty jumbled up. Do I have to just wait for leaves. When will there be leaves on it?Thanks alot for any answers

Is this a grape vine?
I am going to try to grow some grapes this year. They need a trellis. I believe you can trim them to train them. Many fruit trees need to be trimmed in order to produce fruit.