People often keep vodka in the freezer. I'm not entirely sure the reasoning behind this, but I've done it in the past simply because the thought of drinking vodka stored at room temperature makes me shudder. As it turns out, keeping vodka in the freezer is actually a big no-no—if you want its full flavor potential, that is.
Francois Thibault, creator of Grey Goose, recently told Business Insider that putting vodka in the freezer is one of the biggest vodka-related mistakes people make. The problem is that keeping the vodka at such low temperatures subdues any flavor within the liquid. Per BI, premium vodkas such as Grey Goose should be "naturally soft and not aggressive," meaning that if you keep it at really low temperature, "you'll actually be hiding the more sophisticated aromas and flavors."
On the other hand, if you're drinking cheap, low-quality vodka (no shame!), storing it in the freezer will hide "aggressive, burning notes," Thibault tells the site. So basically, if your vodka is...not premium, you're probably doing yourself a favor by keeping it in the freezer.
The best temperature for Grey Goose, Thibault says, is zero-to-four degrees Celsisus (32 to 39.2 degrees Fahrenheit). He says this is the temperature of "a slight dilution with ice in a mixing glass." He notes that even Grey Goose would be a bit aggressive at room temperature. Sounds like adding a few ice cubes is the way to go!