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Sear the rib roast (prime rib) for 15 minutes at the higher oven temperature (450 degrees F.), then turn the oven to the lower temperature (325 degrees F.) for the rest of the cooking time. Every 1/2 hour, baste the cut ends of the roast with the fat accumulated in the roasting pan. Do Not Cover the roast.
1 Roast in preheated oven until cooked to your desired degree of doneness; about 4 1/2 hours (20 minutes a pound) for medium-rare. 2  Roast to an internal temperature of 120 degrees F (49 degrees C) for medium-rare; 130 degrees F (54 degrees C) for medium; or 140 degrees F (60 degrees C) for well done.irections. Prep. Cook. Ready In. 1  Remove prime rib from refrigerator and allow the meat to come to room temperature, about 3 hours depending on the size of the roast. 2  Preheat oven to 425 degrees F (220 degrees C).