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The freezing point would be lowered from 0 °C to about -6 °C by the alcohol alone. In addition, there are some sugars, salts, etc. which will lower the freezing point a little more.

It's important to realize, however, that the wine will not all freeze if cooled down to that freezing point. When some ice starts to form, it contains almost pure water, leaving the remaining liquid with an increased concentration of alcohol etc, and hence a lower freezing point. Pure ethanol has a freezing point of around -117 °C. So even if your car gets cold, you'll get wine slush, not solid wine ice.

Nonetheless, if it's good wine, you shouldn't be carrying it around in the trunk because it might be damaged by heat. Also, if some does freeze, the increased volume of the ice (water is weird that way) might increase the pressure enough to slide the cork out some, and degrade the seal. If you were more unlucky, perhaps the ice could plug the neck and the bottle might crack.

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