In addition to drying out and texture changes from the repeated freeze-thaw cycle of self defrosting refrigerators, frozen yogurt (and other frozen foods) can become rancid. In this process, fats break down into components with undesirable odors and/or flavors. read more
Frozen yogurt will keep a long time in a freezer, however it's not recommended that you leave any kind of food in a freezer for more than three months. read more