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One way to cook a 10-lb. turkey is to roast it in the oven. The USDA recommends that you use an oven that is heated to at least 325 degrees Fahrenheit. At that temperature, a 10-lb. turkey will take about three hours to cook if it is thawed first.A frozen turkey may take about 4.5 hours to cook through.The turkey is safe to eat when it reaches a temperature of 165 degrees, according to the USDA.Creatas Images/Creatas/Getty Images.t that temperature, a 10-lb. turkey will take about three hours to cook if it is thawed first. A frozen turkey may take about 4.5 hours to cook through. The turkey is safe to eat when it reaches a temperature of 165 degrees, according to the USDA. Creatas Images/Creatas/Getty Images.
Check the temperature of the roast using a meat thermometer 30 to 45 minutes before you expect the roast to be done. For example, with a 10 pound roast, you would expect 2 1/2 hours of total cooking time (15 minutes at 500Â° and 2 1/4 hours at 325Â°).In this case, check after 1 hour 45 minutes of total cooking time, or 1 hour 30 minutes after you lowered the oven temp to 325Â°. After browning the roast at a 500Â°F temperature in the oven for 15 minutes, reduce the oven temperature to 325Â°F. To figure out the total cooking time, allow about 13-15 minutes per pound for rare and 15-17 minutes per pound for medium rare.