How to Tell if Portabella Mushroom Is Bad?

Last Updated on May 31, 2023 by Lauren Beck

As a seasoned cook, I’ve had my fair share of encounters with portabella mushrooms. Their earthy flavor and meaty texture make them a prized ingredient. 

But what happens when they go bad? Fear not, my friends! I have some simple yet effective ways to help you identify if your beloved portabella mushrooms have passed their prime. 

Get ready to become a mushroom detective!

8 Ways to Tell if Portabella Mushroom Is Bad:

  1. Foul odor: If your portabella mushrooms emit a strong, unpleasant smell, similar to ammonia or rot, it’s a clear sign that they have spoiled and should be discarded.
  2. Slimy texture: Fresh portabella mushrooms have a firm and dry texture. If they feel slimy or sticky to the touch, it indicates that they are past their prime and should not be consumed.
  3. Discoloration: Pay attention to any significant color changes in your mushrooms. It clearly indicates spoilage if they appear darkened, discolored, or have mold spots.
  4. Wrinkled appearance: Fresh portabella mushrooms have smooth and plump caps. If you notice that the caps have become wrinkled, shriveled, or mushy, it’s a sign that they are no longer fresh.
  5. Excessive moisture: Mushrooms naturally contain some moisture, but if you find excessive wetness or a buildup of liquid in the packaging or around the mushrooms, it suggests that they have started to deteriorate.
  6. Mushy stems: The stems of portabella mushrooms should be firm and sturdy. If the stems have become soft, slimy, or mushy, it indicates that the mushrooms are no longer good to eat.
  7. Mold growth: Mold is a clear sign of spoilage. If you see any fuzzy or unusual growth on the surface of your portabella mushrooms, it’s best to discard them.
  8. Off taste: Fresh portabella mushrooms have a mild, earthy flavor. If you notice any bitter or off flavors when tasting the mushrooms, it strongly indicates that they have gone bad.

What Is the Portabella Mushroom?

Portabella mushrooms, also known as portobello or cremini mushrooms, are matured versions of the common button mushroom [1]. 

They have a meaty texture and robust flavor and are often used as a vegetarian substitute for meat in various dishes.

How Long Do Portabella Mushrooms Last?

Fresh portabella mushrooms can last about 7 to 10 days when stored properly. 

However, it’s important to remember that their shelf life may vary depending on their freshness at the time of purchase.

How Long Do Portabella Mushrooms Last in the Fridge?

To extend the shelf life of portabella mushrooms, store them in a paper bag or a loosely wrapped container in the refrigerator. 

Refrigerated, they can last up to a week, maintaining their quality and flavor.

Can You Cook Spoiled Portabella Mushroom?

Portabella Mushroom on a Wooden Table

Cooking spoiled portabella mushrooms will not make them safe to eat. If you suspect that your mushrooms have spoiled, it’s best to discard them to avoid any potential foodborne illnesses.

How to Properly Store Portabella Mushroom?

To maximize the shelf life of portabella mushrooms, follow these storage tips:

  • Store them in a paper bag or a loosely wrapped container to allow air circulation.
  • Keep them in the refrigerator, ideally in the vegetable drawer.
  • Avoid washing the mushrooms until ready to use them, as excess moisture can accelerate spoilage.
  • Use a clean, damp cloth to remove dirt or debris before cooking.


In the realm of culinary adventures, knowing when a portabella mushroom has gone bad is a vital skill. By relying on your senses and paying attention to signs like odor, texture, discoloration, and taste, you can confidently determine if your mushrooms are still fresh or past their prime. 

Remember, it’s better to err on the side of caution and discard any questionable specimens. With these tips in your culinary arsenal, you’ll be able to enjoy the deliciousness of portabella mushrooms at their peak, ensuring that your dishes are always flavorful and safe. Happy mushroom hunting!


Lauren Beck
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