120°F to 125°F 120°F to 125°F
30 minutes before the end of the cooking time remove the prime rib roast from the oven and check the internal temperature. For the roast to be rare the internal temperature should be 120°F to 125°F but remove from the oven when it is 115°F to 120°F and allow to stand for 20 minutes.  Directions. 1  Preheat oven to 450°F. 2  Pat the rib roast dry with a paper towel or napkin. 3  Smear the cut ends of the roast with the butter. 4  Place the roast (ribs down or fat side up) in roasting pan. 5  Sear the rib roast for 15 minutes at 450°F, then turn the oven to 325°F for the rest of the cooking time. 1 Sear the rib roast for 15 minutes at 450°F, then turn the oven to 325°F for the rest of the cooking time. 2  Every 1/2 hour, baste the cut ends of the roast with the fat accumulated in the 1 After 20 minutes turn the oven down to 325 degrees F. and roast until the desired internal temperature is reached (see guide below). 2  For medium-rare this will take approximately 15 minutes per pound. 3  Transfer to a large platter, and let the prime rib rest, loosely covered with foil for 30 minutes before serving. 1 Rub the entire surface of the cold roast with butter, and coat evenly with the kosher salt and black pepper. 2  Leave the prime rib out at room temperature for 2 hours. 3  Preheat the oven to 450 degrees F. 4  When the oven is hot, put the roast in and cook for 20 minutes to sear the outside of the roast. 1 Smear the cut ends of the roast with the butter. 2  Place the roast (ribs down or fat side up) in roasting pan. 3  Sear the rib roast for 15 minutes at 450°F, then turn the oven to 325°F for the rest of the cooking time. 4  Every 1/2 hour, baste the cut ends of the roast with the fat accumulated in the roasting pan. 1 Sear the rib roast for 15 minutes at 450°F, then turn the oven to 325°F for the rest of the cooking time. 2 1 Preheat oven to 450°F. 2  Pat the rib roast dry with a paper towel or napkin. 3  Smear the cut ends of the roast with the butter. 4  Place the roast (ribs down or fat side up) in roasting pan. 5  Sear the rib roast for 15 minutes at 450°F, then turn the oven to 325°F for the rest of the cooking time. 1 Sear the rib roast for 15 minutes at 450°F, then turn the oven to 325°F for the rest of the cooking time. 2  Every 1/2 hour, baste the cut ends of the roast with the fat accumulated in the 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. Prime Rib Roast (standing rib roast), at room temperature (very important) 2 tablespoons butter, room temperature. Preparation: Preheat oven to 450 degrees F. Pat the room-temperature standing rib roast (prime rib roast) dry with paper towels or napkins. 1 Place the roast (ribs down or fat side up) in roasting pan. 2  Sear the rib roast for 15 minutes at 450°F, then turn the oven to 325°F for the rest of the cooking time. 3  Every 1/2 hour, baste the cut ends of the roast with the fat accumulated in the roasting pan. 1 Sear the rib roast for 15 minutes at 450°F, then turn the oven to 325°F for the rest of the cooking time. 2 Residual Heat or Carry-Over Cooking: Remember, the rib roast will continue to cook as it sets. The internal temperature will rise to 125 degrees F. to 130 degrees F. (medium rare) in approximately 15 to 20 minutes. If allowed to rest as long as an hour, the internal temperature will rise even higher. So, pay attention to how long you let the cooked prime rib roast sit. Prime Rib Roast (standing rib roast), at room temperature (very important) 2 tablespoons butter, room temperature. Preparation: Preheat oven to 450 degrees F. Pat the room-temperature standing rib roast (prime rib roast) dry with paper towels or napkins. 1 When the oven is hot, put the roast in and cook for 20 minutes to sear the outside of the roast. 2  After 20 minutes turn the oven down to 325 degrees F. and roast until the desired internal temperature is reached (see guide below). 3  For medium-rare this will take approximately 15 minutes per pound. 1 Rub the entire surface of the cold roast with butter, and coat evenly with the kosher salt and black pepper. 2  Leave the prime rib out at room temperature for 2 hours. 3  Preheat the oven to 450 degrees F. 4  1 Leave the prime rib out at room temperature for 2 hours. 2  Preheat the oven to 450 degrees F. 3  When the oven is hot, put the roast in and cook for 20 minutes to sear the outside of the roast. 4  After 20 minutes turn the oven down to 325 degrees F. and roast until the desired internal temperature is reached (see guide below). 1 Rub the entire surface of the cold roast with butter, and coat evenly with the kosher salt and black pepper. 2  Leave the prime rib out at room temperature for 2 hours. 3  Preheat the oven to 450 degrees F. 4
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internal cooking temperature for medium prime rib roast