How do I cook a frozen lasagna?

The article will provide a helpful guide on how to cook a frozen lasagna; at what temperature a frozen lasagna can be baked, along with other important information about cooking frozen lasagnas.

How do I cook a frozen lasagna?

Frozen lasagnas are defrosted and baked in the same dish that they are assembled in, although some methods allow you to bake the lasagna without defrosting it first.

Lasagnas are a universally loved dish, with everyone having their own particular style of making it. But the trouble with this dish is that it can be time-consuming and take a lot of steps to prepare. To save on time but not on flavor, it is a common practice to assemble a lasagna beforehand, and freeze it so that it can be baked whenever needed. 

People often employ this idea when hosting a party or taking it to a get-together. It is also a useful hack to prep it on the weekends so that it can be baked and served on a busy weekday. Alternatively, you can also prepare two lasagnas at a time and serve one while freezing the other for later.

To cook a frozen lasagna, the first step is to let it defrost overnight in the fridge. If it is still not completely defrosted after leaving it in the fridge all night, be sure to increase the cooking time as needed. Do not allow the lasagna to defrost on the kitchen counter or at room temperature, to prevent it from going bad.

Next, preheat the oven to 375 degrees. If the lasagna is layered up to the brim of the dish, it is recommended to place the lasagna on a rimmed baking sheet to minimize any mess that might be made by the cheese and sauce dripping over the edges and onto the oven floor.

Cover the lasagna with aluminum foil and bake for 50 minutes. Remove the foil and continue to bake another 10 to 15 minutes until completely warm through and through, and bubbly around the edges. Allow it to cool for 5 to 10 minutes, and it’s ready to serve!

How do you cook frozen lasagna without defrosting it?

Frozen lasagna can still be cooked without defrosting it, but that will take a considerable amount of time to bake. A general rule of thumb is to allow about 90 minutes of baking for a frozen lasagna, but it may take longer for a larger dish of lasagna.

It is also important to remember that if the lasagna has been assembled and frozen in a glass dish, and is going to be baked in that same dish, then it cannot be baked frozen, otherwise the glass will break. 

This is because the glass will not be able to withstand the extreme temperature change of the frozen lasagna and the preheated oven, and will shatter. It must be thawed first, or given time in the microwave to allow it to heat up gently, and then be put in the already hot oven to cook.

With the oven preheated to 400 degrees, cover the frozen lasagna with foil and bake for 60 to 75 minutes. Then remove the foil covering and continue to bake for approximately 30 more minutes, making the top layer of cheese and sauce melt, bubble, and turn a light golden brown.

How long can lasagna be frozen?

Uncooked and homemade lasagna can remain at its optimal quality for 2 or 3 months of being frozen if it is properly stored and sealed. However, it will still be safe to consume beyond that time but will start to lose its flavors.

Cooked lasagna that has been defrosted in the fridge can be stored for an additional 3 to 4 days in the refrigerator before baking it again, and it should be eaten immediately as it is at risk of going bad as soon as it reaches room temperature.

Other FAQs about Lasagna that you may be interested in.

Does lasagna have bechamel sauce?

Do you put lasagna sheets on the top?

Do you have to boil lasagna noodles?


We hope this article proved helpful in explaining how to cook a frozen lasagna, and provided useful information on its storage time, and some tips to get even better results.