One of the great things about vinegar is that it is self preserving. In fact, the vinegar institute confirmed in a study that the shelf life of vinegar is nearly indefinite. The reason for this is because of the acid nature of vinegar. Like most condiments, it does not need to placed inside your fridge. In fact, even after a long period of time, white vinegar will remain nearly unchanged. The only vinaigrettes which you may need refrigeration are those that contain fresh herbs, shallots, garlic or onion. If you are unsure, then check the ingredients on your particular brand or style of vinegar you have purchased. Chances are that the expiration date of your bottle of vinegar may end up reaching the limit before the vinegar itself does.