Why You Should Think Twice Before Leaving Out Soup Overnight (2024)

Anjali Prasertong

Anjali Prasertong

Anjali Prasertong is a writer and public health dietitian focused on food systems, racial equity, and nutrition. Originally from Los Angeles, she has taught English in rural Japan, worked as a private chef in Malibu, and led an innovative city-funded corner store program in New Orleans that increased fresh food access in low-income neighborhoods. She was previously a contributing editor for The Kitchn, and currently lives in Denver with her husband and two kids.

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updated Dec 18, 2023

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Why You Should Think Twice Before Leaving Out Soup Overnight (1)

If you’ve ever intentionally or accidentally left a soup or stock in the pot overnight, you’ve probably wondered if it is still safe to eat after reheating. Harold McGee had the same question, especially when he heard about the food writer Michael Ruhlman’s practice of using stock from a pot left out all week. He talked to a food safety expert to find out if reboiled stock is still safe to eat when you leave it out for one night — or even several days.

Quick Overview

Can You Leave Soup Out Overnight?

On most occasions, you shouldn’t leave soup out overnight. This is because when the stock in the soup cools below 130°F, dangerous bacteria can multiply. If you do decide that you want to leave soup out overnight, it’s recommended that you boil the soup for 10 minutes to kill any active bacteria.

The logic behind leaving stock out for extended periods of time is that because the liquid was boiled, any bacteria in it has been killed. While this is true for some bacteria like E. coli and salmonella, other dangerous bacteria species — such as the one that causes botulism — can form inactive spores that survive the boiling process. Once the stock cools below 130°F, these spores can germinate and multiply quickly.

Bringing the stock back up to a boil for one minute will kill any active bacteria, and holding it at a boil for 10 minutes will inactivate the botulism toxin. According the expert McGee consulted, soup or stock left to cool overnight, then reboiled for 10 minutes and properly refrigerated in the morning is still safe to eat because it isn’t cool long enough for the bacteria to germinate and reproduce up to dangerous levels.

But a stock left out for two days “‘almost certainly has high levels of infectious Clostridium perfringens cells, or Clostridium botulinum or Bacillus cereus cells and their toxins, or some combination thereof.'”

And though even a stock left out for days at a time might not technically be toxic after a thorough boiling, its flavor will certainly be compromised:

A reboiled three-day-old stock may be safe to eat, but it is now seasoned with millions to billions of dead bacteria and their inactivated toxins. It’s conceivable that they might add an interesting flavor, but more likely that the bacteria have feasted on the stock’s sugars and savory amino acids, the air has oxidized and staled the fat, and the stock has become less tasty.
Read more: Bending the rules on bacteria at Curious Cook

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Why You Should Think Twice Before Leaving Out Soup Overnight (2024)

FAQs

Why You Should Think Twice Before Leaving Out Soup Overnight? ›

coli and salmonella, other dangerous bacteria species — such as the one that causes botulism — can form inactive spores that survive the boiling process. Once the stock cools below 130°F, these spores can germinate and multiply quickly.

What happens if you leave soup out overnight? ›

On most occasions, you shouldn't leave soup out overnight. This is because when the stock in the soup cools below 130°F, dangerous bacteria can multiply. If you do decide that you want to leave soup out overnight, it's recommended that you boil the soup for 10 minutes to kill any active bacteria.

How to keep Chinese soup overnight? ›

Refrigerating Soups and Stews

It's best to let it cool fully first, but don't worry too much if the soup is still warm—modern refrigerators, set to 40 F or colder, will rapidly bring it down to a safe temperature. You can, if you have room, even refrigerate the whole pot with the soup in it.

How do you know if a soup is spoiled? ›

Look for mold: If you see any mold growing on the surface of the soup, it's definitely time to throw it out. Check the texture: If the soup has become slimy or has a strange texture, it's a sign that it's gone bad. Taste a small amount: If you're still not sure, you can taste a small amount of the soup.

What happens if you put warm soup in the fridge? ›

Dangerous bacterial growth occurs between 41 and 135 degrees F (5 and 57 degrees C). This spectrum is known as the danger zone for foods. Potentially harmful bacteria grow most rapidly at these temperatures. Placing large batches of hot foods in the fridge can push the temperature of the fridge into this danger zone.

Can soup be kept overnight? ›

Many soups, with the possible exception of seafood soups, may taste better the next day! For best safety and quality, plan to eat refrigerated soup within 3 to 4 days or freeze it. And avoid letting soup set at room temperature for more than TWO hours.

Is it safe to leave cooked food out overnight? ›

The U.S. Department of Agriculture (USDA) food and safety basics states cooked food can be left at room temperature up to two hours. If the temperature outside (or inside your house) is 90°F or above, you should cut that time in half.

Is it OK to leave Chinese food out overnight? ›

If one ingredient has a shelf life of four days but another only has a shelf life of two, the dish should be eaten withing two days. It is important to remember that Chinese food that has been left out at room temperature is not safe to eat. They should be placed in the fridge as soon as they are cool.

Can you eat Chinese soup the next day? ›

Yes, soup can usually be reheated. The best way to do so is to place it in a saucepan over a medium heat until it reaches at least 75°C. You may need to add a little water to it while it is heating to prevent it from thickening.

Does soup get better overnight? ›

This can be shown by serving the fresh and the leftover soup to tasters who weren't there during the cooking. They tend to agree that a night of fridge-aging improves the flavor. The soup itself changes.

Is 5 day old soup ok to eat? ›

Most soups can only last in a refrigerator for 3 to 4 days until they risk going bad, so make sure you place your cooled vegetable soup promptly in the freezer before this point. Make sure your soup lasts well by placing it in an airtight freezer-safe container.

Can you get food poisoning from old soup? ›

Clostridium perfringens

Can cause food poisoning when soups, stew, and gravies made with meat, fish, or poultry are left at room temperature and not refrigerated for long periods of time.

Can soup go bad in a day? ›

Most soups stay fresh and retain their flavour in the fridge for three or four days. You should aim to consume refrigerated soup within this timeframe for maximum safety, taste, and quality.

Is it OK to leave warm soup out overnight? ›

Food should not be at room temperature for more than two hours. Shallow containers or small amounts of hot food can be placed directly in the refrigerator or rapidly chilled in an ice or cold water bath before refrigerating. Cover foods to retain moisture and prevent them from picking up odors from other foods.

Why shouldn't you reheat soup more than once? ›

Each time food is cooled, stored and reheated, the likelihood of harmful bacteria multiplying increases. If you do end up with leftovers, it is much safer to either freeze them or reheat them just once.

Should I let soup cool before refrigerating? ›

Once cooled to 70°F, by using one of the above rapidly cooling options, you can place the container of soup in the refrigerator. Place on the top shelf. Leave uncovered until cooled to 40°F. Consume or freeze leftovers within 4 days of preparation.

Can you leave soup in a crockpot overnight? ›

The general rule of thumb is that 2-4 hours is the maximum length of time you can leave food in a slow cooker on warm. After this, it needs to be cooled and transferred into the refrigerator.

Is it safe if leftover soups are left at room temperature for more than 2 hours? ›

After you eat, cool your leftovers rapidly so they don't stay in the danger zone for too long. Don't leave food on your countertop for more than 2 hours (or 1 hour, if it's 90 F or hotter). Put leftovers in the refrigerator right away, even if they are still hot.

Can I reheat stew that was left out overnight? ›

Reheating food may not make it safe. If food is left out too long, some bacteria, such as staphylococcus aureus (staph), can form a heat-resistant toxin that cooking can't destroy. One of the most common sources of staph bacteria is the human body.

Can I leave bone broth out overnight to cool? ›

Remove from heat, cover pot, and let sit on the counter overnight. In the morning, skim off fat, if desired. I only do this when the animal is a very fatty one.

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