A sour or off odor is a major warning flag that pork has spoiled; another indication is a change in color, usually from pink to brown or grey. This type of spoilage bacteria will probably not make you sick if you cook the pork to an internal temperature of 145 degrees Fahrenheit -- or 160 F for ground pork. Another type of bacteria, however, called pathogenic bacteria, does not cause discernible changes to the meat, but can cause illness. For this reason, proper handling of pork is essential. Keep in mind that raw pork will last up to two days past the date marked on the package if refrigerated constantly; if frozen before this point, it will last indefinitely -- although the texture may change if frozen for longer than six months. Keep the pork in its original packaging, or in an airtight container, to prevent contamination and exposure to moisture.