Cooking Time For Prime Rib Roasts

12.09.18

Updated: 06.12.20

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This Prime Rib Roast is cooked to a perfect medium rare, and smothered in a compound butter spiced with chili powder, cumin, fresh herbs, and garlic. This feast is fit for any holiday or special occasion.

Is there anything more truly beautiful and satisfying than a delicious prime rib? We're talking a deep brown crust that is perfectly seasoned with a compound butter with lots of herbs and spices. Then as you slice it open, you reveal a juicy pink center and a maelstrom of drippings and fat.

Prime Rib Roast

Prime rib roast is perfect for a holiday dinner or a special occasion. It's not an economical cut of meat so when you do buy it you want to make it worth your time and money. But when you do make it the right way, get ready for those compliments, because they will be coming.

Choose Well-marbled Meat

The star of a good prime rib roast is obviously the prime rib so make sure you choose the right one. The more marbled your meat, the juicier and more flavored it will be.

If you can afford it, choose a dry-aged cut of beef. Dry-aging is a process where large cuts of meat are held in a temperature and humidity-controlled room for several weeks. The whole idea behind this is that during this time, the meat will become more tender and flavorful.

Buy a bone-in prime rib. The idea behind this is insulation. Meat around the bones will cook slower, therefore the meat around the bones will be extra tender and juicy.

What Ingredients Are Needed for Prime Rib Roast

All you need is the prime rib and seasoning. Seasoning can be as simple as salt and pepper as long as you generously season the meat. However, I wanted to add a bit more flavor into my prime rib by making a compound butter loaded with herbs and spices.

All this compound butter is going to do is just enhance the flavor of the roast. It truly is worth the extra effort.

How to Make Prime Rib Roast

Plan ahead and remove your roast from all its packaging and let it sit out at room temperature for one to two hours. Also make sure your roast is fully thawed, you do not want to cook a roast from frozen. Pat it dry with paper towels.

Preheat your oven to 450 F degrees.

Make the compound butter but mixing the butter together with the herbs and spices using a spatula. This butter will infuse the roast with extra flavor. Totally worth it. Spread this butter all over the roast.

I like to make a gravy from the drippings so I always add some garlic and onion at the bottom of the skillet. Place the roast bone side down over the onions. If you don't have a skillet large enough to fit the roast, use a roasting pan.

Cook the roast for 15 minutes at 450 F degrees then reduce the temperature to 325 F degrees. Continue to cook the roast until your meat thermometer reads 120 F degrees. Estimate about 15 minutes per pound, however, start reading the temperature after about an hour.

Once the thermometer hits 120 F degrees, remove the roast from the oven. Place it on a cutting board and cover it with aluminum foil. Let it rest for 20 minutes. The roast will continue cooking, this is called carry-over cooking, raising the internal temperature to 130 degrees for a perfect medium-rare prime rib.

Prime Rib Roast Internal Temperatures

Timing is a pretty loose guide when it comes to cooking prime rib. Ovens are all different. A thermometer is the ONLY way to guarantee a perfectly cooked prime rib just how you like it.

Rare	120 F degrees (48.9 degree Celsius)
Medium Rare	130 F degrees (54.45 degrees Celsius)
Medium	140 F degrees (60 degrees Celsius)
Medium Well Done	150 F degrees (65.5 degrees Celsius)
Well Done	160 F degrees (71.1 degrees Celsius)

How Long to Cook a Prime Rib Per Pound

The general rule of thumb is 15 minutes per pound but this is a very general rule of thumb. As mentioned above the best way to tell when your prime rib is done the way you want it, is to use a meat thermometer.

Also, always try and give yourself a little wiggle room when serving this for your holiday meal.

How To Serve

My favorite way to serve prime rib is with mashed potatoes. There's nothing more comforting than a slice of this juicy prime rib roast over a cloud of creamy mashed potatoes and smothered in gravy. Here are some other recipes you can serve along with your roast:

Roasted Potatoes
Roasted Mushrooms and Veggies
Old Fashioned Green Beans
Garlic and Herb Roasted Carrots
Dinner Rolls

Prime Rib Roast over mashed potatoes and gravy

Looking for More Beef Recipes? Try These:

Beef Bourguignon
The Best Crock Pot Roast
Beef Brisket Gyros
Garlic Butter Steak Bites
Hungarian Goulash
French Dip Sandwiches
Oven Baked Beef Brisket

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Compound Butter

▢ 8 tablespoon butter unsalted, room temperature (1/2 cup or 1 stick)
▢ 2 teaspoon chili powder I used a mild chili powder
▢ 1 teaspoon cumin ground
▢ 1 tablespoon thyme chopped, fresh
▢ 1 tablespoon rosemary chopped, fresh
▢ 3 cloves garlic minced
▢ 1 teaspoon salt or to taste
▢ 1 teaspoon pepper or to taste
▢ 5 pound prime rib

Prime Rib Roast

▢ 2 medium onions quartered
▢ 5 cloves garlic peeled
▢ 4 sprigs thyme
▢ 2 sprigs rosemary

Remove your roast from all its packaging and let it sit out at room temperature for one to two hours. Also make sure your roast is fully thawed, you do not want to cook a roast from frozen. Using paper towels, pat the roast completely dry.
Preheat your oven to 450 F degrees for at least 30 minutes, while the prime rib comes to room temperature.
In a bowl mix the butter with the chili powder, cumin, thyme, rosemary, garlic, salt, and pepper until well combined.
With either a spatula or your hands, spread the compound butter mixture over the entire roast.
Place the onions, garlic, thyme and rosemary in a large skillet that will fit your roast. If you don't have a large enough skillet, use a roasting pan.
Place the roast over the onions in the skillet.
Cook the roast for 15 minutes at 450 F degrees, then reduce the oven temperature to 325 degrees. Continue to cook the roast until your meat thermometer reads 120 degrees. Estimate about 15 minutes of cooking time per pound of prime rib.
Once the thermometer hits 120 F degrees, remove the roast from the oven and transfer it to a cutting board. Cover it with aluminum foil and let it rest for 20 minutes. The roast will continue to cook as the juices inside settle, raising the internal temperature to 130 degrees for a perfect medium-rare prime rib.
Slice and serve with gravy over mashed potatoes.

Gravy

While to roast is resting, place the skillet with the onions, garlic and herbs over medium high heat.
Add the red wine and beef broth and bring to a boil. Lower the heat and simmer for about 5 minutes. The sauce should reduce a bit.
Mix the 1 tbsp of cornstarch with 2 tbsp of water and to the skillet. Whisk it and continue to cook for a few more minutes. The sauce should thicken. Use more cornstarch if wanting a thicker gravy.
Strain into a bowl, then pour it into a gravy boat.

Nutritional information assumes 2 servings per pound.

Calories: 799 kcal (40%) Carbohydrates: 5 g (2%) Protein: 31 g (62%) Fat: 69 g (106%) Saturated Fat: 31 g (194%) Cholesterol: 161 mg (54%) Sodium: 389 mg (17%) Potassium: 609 mg (17%) Sugar: 1 g (1%) Vitamin A: 505 IU (10%) Vitamin C: 4.4 mg (5%) Calcium: 42 mg (4%) Iron: 3.9 mg (22%)

Course: Main Course

Cuisine: American

Keyword: prime rib, prime rib roast, rib roast

Meet Joanna Cismaru

I'm Joanna (Jo for short) and this is my blog where I share with you my culinary adventures. Here you will find a variety of recipes using simple everyday ingredients and creating wonderful, delicious and comforting meals, including some decadent desserts.

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