How To Reheat A Frozen Fully Cooked Turkey. We like reheating turkey at 300° f—low enough to prevent the heat from drawing moisture away from the meat, but high enough that it won’t take hours to reheat. First, preheat your oven to 325° f.

Cover the turkey with foil and place in oven. Remember leftover meat and poultry can be refrigerated for two days or frozen for up to three months. During final 1 hour, check internal temperature by inserting thermometer into thickest part of breast.