Yes, wine can be frozen, but after spending time in the freezer, it will be better suited to cooking than drinking. For an easy way to freeze your leftover wine, just pour it into an ice cube tray. Then, transfer the finished cubes to a freezer bag. One cube is usually the equivalent of two Tablespoons.
Tip: Don't worry about thawing the cubes. They'll melt quickly when added to a hot pan.