Hamburger, like other raw ground meats, can be refrigerated for 1 to 2 days in a refrigerator set to 40 Fahrenheit or below. The cooler temperature helps slow the growth of bacteria, though it doesn't completely stop it.
Bacterial growth occurs more rapidly in foods stored between 40 and 140 degrees Fahrenheit. Failure to properly store food can result in food poisoning. Other types of raw meats, such as steaks, chops and roasts, can safely be stored in the refrigerator for 3 to 5 days, whereas cooked foods, such as poultry, seafoods and other meats, can last between 3 and 4 days in the refrigerator.