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Frozen Pizza Thawed – Is It Still Safe to Eat?

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Frozen pizza is a convenient and popular choice for quick and delicious meals. However, many of us have found ourselves in situations where we have leftover frozen pizza that needs to be thawed before consumption.

The question arises – is thawed frozen pizza still safe to eat? Understanding the potential risks and best practices for handling thawed pizza is essential to ensure both the quality and safety of the meal.

So the answer to this question mainly depends on those factors. It’s not a yes or no answer, unfortunately. Luckily, today’s comprehensive guide will explain everything in detail.

In this article, we will explore the science behind freezing and thawing pizza, the physical changes it undergoes, and how temperature affects bacterial growth.

Delving into expert advice and food safety guidelines, we will provide a comprehensive understanding of how to properly handle, store, and reheat thawed pizza to enjoy it without compromising on taste or jeopardizing our health.

What Happens When Pizza Is Frozen, Then Thawed?

When pizza is frozen, its temperature is rapidly reduced to below freezing point, typically around -18°C (0°F) or lower. During this process, the water content in the pizza’s ingredients turns into ice crystals.

These ice crystals form throughout the pizza, causing physical changes in its structure. As the ice crystals grow, they can create small ruptures in the pizza’s texture, resulting in potential changes in taste and texture when thawed.

When the frozen pizza is thawed, the ice crystals melt, and the water content returns to its liquid state.

This can lead to moisture accumulation, making the pizza soggy. Additionally, some ingredients like vegetables may become limp or lose their crispness due to the water content changes.

Regarding bacterial growth, freezing does not kill bacteria but rather puts them in a dormant state. When the pizza is thawed, the temperature rises to a range that allows bacteria to become active again and multiply.

If the pizza is thawed at room temperature for an extended period, the conditions become favorable for bacterial growth, potentially leading to foodborne illnesses.

And that is mainly the reason this question is still so prominent online today.

Is Thawed Frozen Pizza Safe to Eat?

Generally speaking, there shouldn’t be anything unsafe about thawed frozen pizza. The biggest risk factor is bacterial growth, which is actually very easily controlled.

thawing frozen pizza at room temperature

The bigger question in our opinion is whether or not thawed pizza is still appealing to eat. This is a personal question and while many don’t mind the flavor and texture changes that occur during the process, others cannot stomach it.

How to Tell if Thawed Pizza Has Gone Bad?

Knowing if the frozen pizza has gone bad is essential to avoid consuming spoiled food. 

Check the Expiry Date

Start by examining the packaging for the “use-by” or “best-by” date. If the pizza has passed this date, it may not be safe to consume, and its quality might have deteriorated.

Inspect the Packaging

Look for any signs of damage, such as tears, punctures, or freezer burns. Freezer burn appears as discolored, dry, or frosty patches on the pizza’s surface and can indicate that the pizza has been improperly stored or is too old.


Give the pizza a sniff. If it emits an off or foul smell, it’s a clear sign that it has gone bad. Spoiled pizza can have a sour or rancid odor due to bacterial growth or deterioration of ingredients.


Visually inspect the pizza’s texture. If the crust appears excessively dry, brittle, or discolored, it may be a sign of freezer burn or spoilage.


Check for any signs of mold growth on the pizza’s surface. Mold indicates that harmful microorganisms have proliferated, and the pizza is no longer safe to eat.


If the pizza crust or toppings appear excessively soggy or mushy, it might have been exposed to moisture during storage or thawing, leading to spoilage.


If the pizza tastes sour, off, or different from what you expect, it is a strong indication of spoilage.

How to Properly Thaw Pizza

Improper thawing can lead to bacterial growth and spoilage, compromising the taste and safety of the pizza.

frozen pizza

The best and safest method to thaw pizza is in the refrigerator. This process involves placing the frozen pizza on a plate or in a container and letting it thaw slowly in the refrigerator.

Refrigerator thawing allows for a gradual temperature change, which minimizes bacterial growth and preserves the pizza’s texture and flavor.

Plan Ahead

Thawing pizza in the refrigerator requires planning. Determine when you want to eat the pizza and take it out of the freezer accordingly.

Large pizzas may take 24 hours or more to thaw completely. A pizza slice can take anywhere between 1-4 hours.

Avoid Room Temperature Thawing

Thawing pizza at room temperature should be avoided however tempting.

Bacteria can multiply rapidly at room temperature, increasing the risk of foodborne illnesses. If you forget to plan ahead, opt for other safe thawing methods like cold water thawing (described below).

Cold Water Thawing (Plan B)

If you need to thaw pizza quickly, cold water thawing is an acceptable alternative to room temperature thawing. Place the frozen pizza in a sealed plastic bag and submerge it in cold water. Change the water every 30 minutes to ensure it remains cold. This method can significantly speed up the thawing process.

Avoid Thawing in the Microwave

Thawing pizza in the microwave is not recommended as it can partially cook some parts of the pizza while leaving other areas frozen. Uneven thawing increases the risk of bacterial growth and spoils the texture of the pizza.

Do Not Refreeze Thawed Pizza

Once the pizza has been thawed, it should not be refrozen. Refreezing can result in a loss of quality and taste, as well as increase the risk of bacterial contamination.

Cooking Immediately After Thawing

Once the pizza is thawed, it should preferably be cooked immediately. Cooking at the right temperature ensures any potential bacteria are killed, making the pizza safe to eat.

How to Store Thawed Pizza

After thawing pizza, proper storage is crucial to maintain its freshness and safety.

It should be stored in an airtight container or wrapped tightly with plastic wrap to prevent exposure to air and moisture. Alternatively, you can use a resealable plastic bag.

Refrigerate the pizza promptly and ensure it is placed on a shelf away from raw meat and other potential sources of cross-contamination.

Thawed pizza can typically be safely stored in the refrigerator for 3 to 4 days. If you have a considerable amount of leftover pizza, consider dividing it into smaller portions for easier reheating and to reduce wastage.

The refrigerator should be set at a temperature of 40°F (4°C) or below. This temperature range helps to slow down the growth of bacteria and keep perishable foods fresh and safe for consumption. Keeping the fridge at the proper temperature is essential for food safety and maintaining the quality of stored items.

How to Reheat Thawed Pizza

Take the thawed pizza out of the refrigerator and let it sit at room temperature for about 15-20 minutes to minimize temperature differences during reheating.

Preheat your oven to 375°F (190°C). Place the pizza directly on the oven rack or use a baking sheet lined with parchment paper for easy cleanup.

Ensure the pizza is spread out evenly on the rack or baking sheet, allowing each slice to heat uniformly.

reheat thawed pizza

Reheat the pizza for about 10-15 minutes or until the cheese is melted and the crust becomes crispy again. The time may vary depending on the thickness and toppings of the pizza.

Try to reheat the pizza only once. Repeated heating and cooling can affect the taste and texture of the pizza.

Storage: If there are any leftovers after reheating, allow the pizza to cool and then store it in an airtight container in the refrigerator. Consume the leftovers within 3 to 4 days.

Related Questions

Why Should You Avoid Thawing Pizza at Room Temperature?

At room temperature, the surface of the pizza can reach the “danger zone” (between 40°F to 140°F or 4°C to 60°C), where bacteria multiply most rapidly. As the pizza thaws, the outer layers warm up quickly, while the inner parts remain frozen, leading to uneven thawing and potential spoilage.

Bacteria can multiply to unsafe levels during this process, increasing the risk of foodborne illnesses.

How Long Can Thawed Pizza Stay at Room Temperature?

Thawed pizza should not be left at room temperature for more than 2 hours. Leaving thawed pizza at room temperature for an extended period allows bacteria to grow to unsafe levels, compromising the safety and quality of the pizza.

To ensure food safety, it is essential to promptly cook or refrigerate the thawed pizza within the 2-hour window. If the pizza has been left at room temperature for longer than 2 hours, it should be discarded to prevent the risk of food poisoning.

Can You Reheat Thawed Pizza Twice?

It is generally not recommended to reheat thawed pizza twice. Each time you reheat food, including pizza, it goes through a cycle of cooling and reheating, which can promote bacterial growth and compromise food safety.

Repeated heating and cooling can also affect the taste and texture of the pizza, making it less enjoyable. To ensure food safety and maintain the best quality, it is advisable to reheat pizza only once after thawing.

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