Smoked Prime Rib With Horseradish Butter

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Learn the best way to cook Prime Rib. This Smoked Prime Rib is slow smoked, finished with a high heat, and then topped with a homemade Horseradish Butter. This is truly one amazing holiday roast recipe that your guests will never forget.

Smoked Prime Rib Roast sliced and topped with butter

The best part is that it is super easy to prepare and make! I promise you.

What is Prime Rib?

Prime Rib is one of the primal cuts of meat from a cow that comes from the ribs. What is a primal cut? It’s some of the first cuts to be butchered off a cow, thus the term “primal” cut. The Prime Rib can also be called a standing rib roast, or rib roast.

A Prime Rib can be bone-in or boneless, and either are great for smoking. Prime does not necessarily refer to the USDA quality rating of Select, Choice, or Prime.

We use an incredibly marbled boneless Snake River Farms American Wagyu roast for this particular recipe. But you can see a bone-in version here.

Whether you buy a boneless or bone-in, this recipe is going to work great for you.

Smoked Holiday Roast with horseradish butter to the side

How To Prepare a Prime Rib Roast?

One of the first tasks is to trim off excess fat from the rib roast using a sharp knife. When ordering a bone-in version, ask the butcher for how many bones you want. A three bone rib roast can weigh roughly 4 – 6 pounds.

  • Preparing Bone-In Prime Rib – Using a long sharp knife cut along the bone to completely remove it from the roast. Remove excess fat, and then tie the bone back on using butcher’s twine. The butcher may have already done this for you.
  • Preparing Boneless Prime Rib – Simply trim off excess fat from the exterior of the meat.

Season the beef roast with your favorite dry rub after using a binder agent, like Worcestershire Sauce, to allow the rub to stick to the meat. This is not necessary but also adds a nice flavor profile to the exterior of the meat and is the way we recommend you prepare it.

What is the Best Dry Rub for Smoked Prime Rib

For a dry rub, stay very simple with equal parts kosher salt, coarse ground pepper, and granulated garlic (be sure it is granulated versus powder). This allows the meat flavor to shine through. Use a 1/4 cup of dry rub for 4 pounds of meat, or one tablespoon of rub per pound.

How Much Prime Rib Will I Need?

Typically plan 3/4 pounds – 1 pound of meat per person. That takes into consideration the bone (if you use bone-in) and any loss from trimming and cooking.

How To Cook a Prime Rib Roast?

There are many ways to cook a prime rib roast.

  • Oven – When roasting in the oven, using a temperature of 375 degrees Fahrenheit allows the roast to cook evenly and get a nice browning exterior.
  • Grill – Using two zone cooking, a Prime Rib can be grilled. The important component to grilling, is using indirect heat, keeping the temperature less than 400 degrees inside the grill, and rotating the roast so one side doesn’t burn.
  • Smoking or Reverse Sear – Smoking at a low heat, like 250 degrees F with wood adding a smoke flavor. Add high heat at the end to get that roast (or char) component to the exterior.
  • Resting – No matter how you cook it, it’s important to let the rib roast rest for 30 minutes covered in foil. The resting allows the cells to cool down and as they do, they pull back in the moisture from the cooking. Keeping the cut tender and juicy.

How Long to Smoke a Prime Rib Per Pound

  • Rare: Internal Temperature 115 – 130 degrees F (30 minutes per pound)
  • Medium Rare: Internal Temperature 130 – 145 degrees F (40 minutes per pound)
  • Medium: Internal Temperature 145 – 155 degrees F (50 minutes per pound)
  • Medium Well: Internal Temperature 155 – 165 degrees F (60 minutes per pound and not recommended for Prime Rib)
  • Well: We don’t even go there for this particular cut 😉

The rule for cooking any meat, it is done when the internal temperature tells you it is done. Every cut of meat is going to be different as they all come from a unique animal with various levels of fat content. We prefer our Prime Rib cooked to 125 degrees F or rare.

Use instant read thermometers to assist in the cook. Consider the Thermoworks Smoke unit for a two zone cooker, or the Thermapen for instant read. They are both great investments as is the money spent on a rib roast.

Horseradish Compound Butter

While the roast is resting, prepare the Horseradish Compound Butter. This is also something to prepare days in advance. A compound butter is simply a butter with added ingredients mixed together to form a new butter with flavor.

Using room temperature butter add extra hot horseradish, kosher salt, and garlic, and mix. Roll out in a log to prepare for serving over the top of the warm Prime Rib.

How to Smoke a Prime Rib?

Prime Rib on the smoker with a thermomemter attached

Target the ambient cooking temperature at 250 degrees F, and use a fruit wood or oak. Mesquite and Hickory are fine too, it just adds a lot more distinct smokiness to the meat, and for Prime Rib, we really want the smoke as an ingredient, not the predominant flavor.

If using a pellet grill or offset, consider using a water pan. We find they tend to need additional humidity in the cooker.

For Kamado Grills, like a Big Green Egg, we do not use a water pan as they are very efficient and tend to retain moisture very well.

If adding high heat at the end, or a reverse sear, increase the heat when the internal temperature is 10 degrees lower than your desired finishing temperature. That is when to raise the heat level on your grill to 400 – 450 degrees and direct heat. This is the way we like to do it, and the way you’ll see in this recipe and on the video below.

Chef Note: Let the roast rest 30 minutes tented in foil. This helps with the cells reabsorbing the moisture from cooking.

When ready to serve, slice the meat and serve with a dollop of the horseradish butter.

Smoked Prime Rib topped with horseradish butter on black slate

Smoked Prime Rib with Horseradish Butter Recipe

Smoked Prime Rib with Horseradish Compound Butter

Slowly smoked and then seared with a high heat, this Prime Rib is tender, and juicy. Finish with a horseradish compound butter as an extra flavor element.
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Print Rate
Prep Time: 30 minutes
Cook Time: 2 hours
Resting Time: 30 minutes
Total Time: 3 hours
Servings: 6 – 8 People
Cost: $150


  • 1 5 – 6 pound Prime Rib or Standing Rib Roast
  • 1/4 cup Worcestershire sauce
  • 2 tablespoons kosher salt
  • 2 tablespoons coarse ground black pepper
  • 2 tablespoons granulated garlic

For the Horseradish Compound Butter

  • 1 stick unsalted butter, room temperature
  • 2 tablespoons extra hot horseradish
  • 2 cloves minced garlic
  • 1 teaspoon kosher salt


  • Prepare Prime Rib by trimming excess fat. Pour and coat roast with Worcestershire sauce. Combine salt, pepper, and garlic in a bowl and coat the roast. This can be done the day prior to cooking or as early as an hour before.
  • Preheat smoker to 250 degrees Fahrenheit using a fruit wood like cherry or apple. Place the roast on the smoker with a wireless instant read thermometer. Smoke at 250 until the internal temperature is 110 degrees Fahrenheit if shooting for rare.
  • Increase internal temperature of smoker to 400 degrees Fahrenheit (or the oven) and cook for additional 30 minutes or until the internal temperature is 120 – 125 degrees F. Remove and let the roast rest covered in foil for 30 minutes and prepare the compound butter.
  • Slice the roast in 1/2 inch slices and serve with a dollop of the compound butter on each steak.

Horseradish Compound Butter

  • In a bowl, combine all ingredients and combine. Layout on plastic wrap and roll into a log. Slice evenly into small tablespoon portions to place over the rib roast.
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Wine Pairing for Prime Rib

Smoked Prime Rib Roast sliced with horseradish butter and rosemary

This is where I like to go big with my wine pairing. Prime rib is rich in flavor and texture, with a good amount of fat throughout. This is where those young tannic Cabernet Sauvignons really shine. Young Cabernet, without food, can be hard to drink because they tend to have mouth drying tannins. But when you pair it with fat, like Prime Rib, the fat in the meat softens those harsh tannins and you really get that pretty fruit.

This recipe also has that slightly spicy horseradish sauce. So I recommend something with a good amount of fruity characteristics. So I stick with New World reds with this (Washington State red wines, California, etc.). One of my favorite pairings for this dish is Washington Cabernet Sauvignon. You can also go California County Cab as well. Merlot, Syrah, even Grenache can be excellent bets with this holiday roast as well. For something old world, you can’t go wrong with a Rhône Valley red.

Holiday Side Dishes

More Holiday Roast Recipes

Where to Buy Prime Rib

Your local butcher can get you quality Prime Rib. Also consider Snake River Farms. Their mail order service of American Wagyu, Prime, and Choice Beef products are amazing and delivered within days to your doorstep.

Enter the code 10VINDULGE at checkout for 10% off any order over $100!

This post contains affiliate links, which means if you click on those links we may receive a small commission. We only partner with products we know and love, and it helps keep the blog going!

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