Perfecting Prime Rib

The accurate way to gauge doneness is to insert an instant-read meat thermometer into the centre of the thickest part of the roast. The numbers below are based on a roasting temperature of 450°F. Remember that the prime rib will continue to cook during the resting period.

Rare

Allow approximately 20 minutes per pound. Remove from oven when internal temperature is 120°F to 125°F.

Medium-rare

Allow approximately 20 to 25 minutes per pound. Remove from oven when internal temperature is 130°F.

Medium

Allow approximately 25 minutes per pound. Remove from oven when internal temperature is 140°F.

Well-done

Allow approximately 30 minutes per pound. Remove from oven when internal temperature is 150°F.