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If it is a commercially frozen lasagna, it should be kept in the freezer until it is taken out to be cooked. Once it has been cooked, the leftover lasagna can be kept safely in the refrigerator for up to two days in a covered container. Learn more about Food Spoilage Sources:
Bring the lasagna to room temperature. If you want to freeze baked lasagna, it's necessary to make sure it has cooled entirely before you freeze it. Otherwise, the texture of the dish won't be as pleasant when it's time to eat it. After making the lasagna, set it aside for one hour to cool.