When do I prune grapevines in the fall

I actually asked the same question not long ago.

KUXJ directed me to this website which was very helpful!

Pruning Grape Vines .net Blog Archive Advice on How to Prune Grape Vines

Hi! fred rich, and welcome to AMHD :)... Hi! Shaz ::BIG HUG::

Dormancy is usually established two weeks after the last leaves have fallen, but some Vineyards will wait until the temps remain below 40°F - 4.45°C

In addition to the link Shaz provided, I've increased my knowledge of caring for grapes, and their vines.

These links can also be found here.
Bringing tomatoes indoors

This is for the first three years
Pruning Backyard Grapevines in the First Three Years, HYG-1429-2004

Prune your grape vines heavily in winter

Protecting Grapevines from Winter Injury pdf

K