Is Gray Ground Beef Safe to Eat? Unveiling the Truth!

Ground beef is a staple for quick weeknight meals. Whether you’re making beefy macaroni, a savory burger, or Korean bulgogi, ground beef is usually the star. But what happens when you pull your ground beef out and it’s sporting a gray hue? Is it still safe to eat? The short answer is: possibly.

What Causes Ground Beef to Turn Gray?

When meat is first cut, it typically has a purple or deep red hue due to its natural color. “When exposed to oxygen, myoglobin—a protein in muscle—reacts and causes the meat to darken,” explains food scientist Brittany Towers from The Black Food Scientist.

Within about 15 minutes of being exposed to air, meat will turn the bright red that we’re used to seeing at the meat counter. After about five days in the refrigerator, the outer layers of the meat will begin to turn gray.

What if the outer layer of the ground beef is red, but the inside appears brownish?

Revisiting the role of myoglobin, we find that it can exist in three states of color: purple, red, and gray/brown. The gray/brown hue can occur after long periods of storage or when the meat is exposed to minimal amounts of oxygen, such as in the center of a ground beef package or when pre-formed burger patties are piled up.

Is It Safe to Cook and Eat?

To determine if raw ground beef is safe for consumption, trust your senses—and a bit of common sense. “As long as the ground beef isn’t slimy or doesn’t have a foul smell, the discoloration shouldn’t be a concern,” Towers advises.

To maintain the freshness of ground beef, use it within a day or two of purchase, or freeze it in a sealed bag with the date marked on it. Ground beef can be stored frozen for up to four months. Always thaw ground beef in the refrigerator before cooking.

It’s important to remember that using an instant-read thermometer is the most reliable method to ensure meat is cooked safely to the appropriate temperature.

If the ground beef appears gray prior to cooking, you cannot rely solely on visual cues to determine if it’s fully cooked. The US Department of Agriculture recommends cooking ground beef to an internal temperature of 160°F.