Ways to Thaw. Frozen Whole Turkeys and Frozen Whole Turkey Breasts need to be thawed before cooking. For the best results, follow one of these methods: Refrigerator Thawing. Thaw breast side up, in an unopened wrapper on a tray in the fridge (40 degrees F or below). Allow at least 1 day of thawing for every 4 lbs. read more