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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:
CLOSE. 1  Cooked pasta can be stored in airtight containers in the refrigerator for 3 to 5 days. 2  Or, freeze cooked pasta for up to 2 weeks: Cool the pasta slightly, then drizzle with a little olive oil or cooking oil and toss gently. 3  Defrost a bag of frozen pasta in a colander in the sink by running tepid water over it.