This Is What Ground Beef Turning Brown Really Means

If your ground beef has turned brown or gray in color, or if the outer layer is still pink but the inside has turned (or vice versa), there are a few other ways to tell if it is okay to use. First, check the expiration date. If the beef is still within its "good by" time period, it is more likely to be safe, as long as it has been transported and stored properly (Healthline). Next, smell it. If the beef has an unremarkable "normal" smell, it is likely not yet spoiled, but if it smells off to you, it's safer to throw it out. Last, feel the texture. If it is slimy or greasy in feeling, toss it. That could indicate bacteria growth and spoilage. If, however, the meat smells fine, feels fine, hasn't yet hit its expiration date, and has been handled properly, you are probably okay to make those tacos.