How Long Should You Cook Beef Tenderloin?
Cook beef tenderloin for 40 minutes to 70 minutes depending on the cut's size and desired doneness. With the oven at 425 degrees Fahrenheit, cook a 1- to 3-pound tenderloin to medium rare for about 40 minutes or to medium for about 50 minutes.
When cooking a 4- or 5-pound tenderloin, roast for about 60 minutes for a medium rare roast or about 70 for a medium done roast. To make the tenderloin extra juicy and flavorful, brown the meat with olive oil in a large skillet over medium-high heat, then transfer to a rack in a shallow roasting pan. Roast the meat to the desired doneness, and let it stand for 15 minutes before slicing and serving.