how cold outside does it have to get before a bottle of wine freezes?

Answer 1

Wine will freeze in your freezer because the alcohol content is low(ish). Your freezer is rarely below 0 degrees F, so a close approximation would be somewhere between 0 and 10 F.

Answer 2

It really depends on the alcohol content. But generally, wine will not freeze unless exposed to below freezing temps for a long time.

Answer 3

It won't freeze, your local wino will drink it befor you know it.