What is the cook time for an 8 pound medium rare beef roast?

To cook an 8 pound beef roast to medium rare, you should cook it at 300 degrees Fahrenheit for about 45 minutes per pound. This means the total cooking time will be around 6 hours. To ensure the roast is cooked to your desired doneness, it's a good idea to use a meat thermometer. The internal temperature of the roast should reach 135 degrees Fahrenheit for medium rare.