Chart for Roasting Prime Rib (Standing Rib Roast)
Source: whatscookingamerica.net

For a generous serving of standing rib, figure on two people per rib. That means if you plan to serve six you should be able to do so with a three rib roast; eight people, four ribs.

NOTES:
This chart is only a guide. You must rely on an accurate meat thermometer and start taking temperatures half an hour before the end of the estimated roast time.
If you want the rested temperature to end at 120, remove roast before it reaches 120 in the oven.

Rib CountApproximate WeightOven TemperatureTotal Estimated TimeMeat Thermometer Reading (Rare)
2 ribs4 to 5 pounds450°/325° F60 to 70 minutes120° F
3 ribs7 to 8.5 pounds450°/325° F1 1/2 to 1 3/4 hours120° F
4 ribs 9 to 10.5 pounds450°/325° F1 3/4 to 2 1/4 hours120° F
5 ribs 11 to 13.5 pounds450°/325° F2 1/4 to 2 3/4 hours120° F
6 ribs 14 to 16 pounds450°/325° F3 to 3 1/4 hours120° F
7 ribs 16 to 18.5 pounds450°/325° F3 1/4 to 4 hours120° F

Bring Prime Rib Roast to room temperature - if you don't let come to room temperature, if will take longer to cook your roast. Pat the rib roast dry with a towel or napkin.

Preheat oven to 450°F.
Season roast with salt and pepper, as desired. Opt: Rub with or insert garlic all over.
Place the roast (ribs down) on the rack in the roasting pan.

Sear the rib roast for 15 minutes at the higher oven temperature (450°F), then turn the oven to the lower temperature (325° F) for the rest of the cooking time. Note: all ovens are different, especially between gas and electric. For electric, I preheat the oven to 450 and turn down to 325 sooner than 15 minutes since it takes longer for the oven temp to go down.
About 1/2 hour before the estimated end of the roasting time, begin checking the internal temperature. Cook until rib roast reaches an internal temperature of 120°F (lower if you want the finished temp to be 120). Remove from oven, cover with aluminum foil, and let sit approximately 20 to 30 minutes.

NOTE: The rib roast will continue to cook as it sets. The temperature will rise to 125 to 130° F. internal temperature (medium rare) at 15 to 20 minutes. If allowed to rest as long as an hour, the temperature will rise even higher. So, pay attention to how long you let the cooked prime rib roast sit.

Beef Roast Cooking Temperatures
Rare120 to 125° Fcenter is bright red, pinkish toward the exterior portion
Medium Rare130 to 135° Fcenter is very pink, slightly brown toward the exterior portion
Medium140 to 145° Fcenter is light pink, outer portion is brown
Medium Well150 to 155° Fnot pink
Well Done160° F and abovesteak is uniformly brown throughout



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