Question: how long to cook a frozen roast?
Answer: Don't open the door; use the oven light to check it. Wait for the wonderful smell, about 20 minutes. After about 30 minutes, turn down the heat to 250-300 degrees, and keep cooking it for about 20-25 minutes per pound for rare and 30-35 minutes per pound for medium. So, a 4-pounder would cook for about 2 hours.