what temp is rare meat for grilling prime rib?
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 120Â°F to 125Â°F but remove from the oven when it is 115Â°F to 120Â°F and allow to stand for 20 minutes. Cover and place in the refrigerator for 2 hours. 2  Remove every 30 minutes and turn the roast in the marinade. 3  Remove from the refrigerator and allow the prime rib to set out for approximately two hours before cooking. 4  Allow it to reach room temperature before placing in the oven.