It also depends on the type of grape you have.
I have an old wild grape that now produce well if I make sure that only the oldest best brances are left, I trim either fall or early spring, but I also now have a unknown grape type, that was left by a renter and i planted it out of curiosity.
It took five or so years before it was more than a few sad branches coming out of the ground. I was very happy that year, then my sig. decided to mow lawn and mowed it off.
I was not happy, BUT, that year it then suddenly acted like kid on a sugar rush and grew from zero to about eight feet, with a lot of grapes.
It is neither a wild grape, nor a table grape, but it is doing very well now.
At my mother's, place I planted Concorde and three other types of grapes. The Concorde is now doing very well but the others, have produced one cluster, but are neither thriving nor dying.
We get sub-zero winters, and if it does not snow enough to reduce ground frost, the grapes do not die, but die way back.
