How Long Do You Cook A 3 Pound Roast Beef At 350?
The general rule of thumb is to cook a 3-pound roast beef at 350°F for about 45-60 minutes per pound, which means you should cook it for 2 to 2.5 hours until it reaches an internal temperature of 135-140°F for a medium-rare result. However, it’s always best to use a meat thermometer to ensure your roast beef is cooked to your desired doneness.