Do wineries take credit cards north of Avignon France?

Can't speak for Avignon, but in Burgundy they were happy to accept credit cards.

In my experience, most, but not all, wineries anywhere in France take credit cards. The exception will often be small farm wineries where the tasting room is part of the cellar.

The wine cooperative in Gigondas does-and they offer more than 100 different wines for the tasting-no push to buy. A great experience.