Ground beef can spoil quickly so learning the warning signs helps protect your health. If the beef changes color to dull brown or gray it may be starting to spoil and if it has a sticky or slimy texture it is definitely unsafe. A sour or unpleasant odor is another clear indicator that the meat should be thrown out immediately. Even if only one sign appears it is best not to take any c... https://www.dskkblade.com/blogs/food-news/how-long-is-ground-beef-good-in-the-fridge