Herb Butter Prime Rib with Golden Potatoes

See How It’s Done

Herb butter prime rib is a 2-bone prime rib roast (4-5 pounds) coated in garlic herb butter made with rosemary, thyme, chives, and minced garlic, then smoked at 250°F until it hits 123-125°F internal for perfect medium-rare. The prime rib sits on a rack above a pan of seasoned golden potatoes that catch all the herb butter drippings as the roast cooks. The result is prime rib with a golden crust packed with fresh herb flavor, meat that’s perfectly pink and juicy edge to edge, and potatoes that are crispy on the outside, tender inside, and infused with all those rich drippings. This smoked prime rib recipe is perfect for holidays, special occasions, or any time you want to impress people with a restaurant-quality roast.

The whole process takes about 3-3.5 hours from start to finish including prep, smoking, and rest. You season the prime rib with coarse steak seasoning, coat it completely in homemade herb butter, smoke it at 250°F for 2-3 hours while the potatoes cook underneath, then let it rest for 15 minutes before slicing. The low smoking temperature gives you even cooking from edge to edge with minimal gray band. These golden potatoes cooked in the drippings are a bonus side dish that tastes better than anything you could make separately.

Why a 2-Bone Prime Rib Is Perfect for Small Gatherings

A 2-bone prime rib roast weighs about 4-5 pounds and feeds 4-6 people comfortably. This is the perfect size for smaller gatherings, holidays with just family, or when you want prime rib without committing to a massive 7-8 bone roast that feeds 12-15 people.

Prime rib is cut from the rib section of the cow. Each rib bone adds about 2-2.5 pounds. A standing rib roast with 2 bones is easier to handle, faster to cook, and fits on most smokers without needing special equipment.

The bones add flavor during cooking and make the roast look impressive when you present it. After cooking, you can slice between the bones to serve bone-in ribeye steaks, or you can remove the bones and slice the meat into individual portions.

Why Herb Butter Is Better Than Dry Rub for Prime Rib

Prime rib is an expensive, well-marbled cut. It doesn’t need aggressive seasoning that covers up the beef flavor. Herb butter enhances the natural richness of the meat without overpowering it.

When you coat the prime rib in softened herb butter before smoking, the butter melts as the roast cooks and bastes the meat continuously. The fat in the butter carries the flavor from the fresh herbs and garlic deep into the crust. As the butter melts and drips down, it also flavors the potatoes underneath.

The combination of rosemary, thyme, chives, and garlic is classic for beef. Rosemary is earthy and piney, thyme is floral and slightly minty, chives are mild and oniony, and garlic adds savory depth. Together, they create a complex herb flavor that complements the beef without competing with it.

Why Smoking at 250°F Gives You Perfect Medium-Rare

Smoking prime rib at 250°F is the sweet spot. It’s hot enough to render the fat and develop a crust, but low enough to cook the roast evenly without creating a thick gray band of overcooked meat around the edges.

When you cook prime rib at higher temps (like 350°F or 400°F), the outside overcooks while the inside is still rare. You end up with a thick layer of gray, well-done meat around a small core of pink. At 250°F, you get edge-to-edge pink with just a thin crust.

For a 4-5 pound, 2-bone prime rib at 250°F, expect about 2-3 hours of cook time to reach 123-125°F internal. That’s about 30-40 minutes per pound. Always use a meat thermometer to check—don’t rely on time alone.

Pull the roast at 123-125°F for medium-rare. During the 15-minute rest, carryover cooking will bring it up to 130-135°F, which is perfect medium-rare.

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Step-by-Step Instructions

Step 1: Prep and Season the Prime Rib

Take your 2-bone prime rib roast out of the refrigerator about 30-60 minutes before cooking so it can come up to room temperature slightly. This helps it cook more evenly.

Pat the roast completely dry with paper towels. Moisture on the surface will prevent the butter from sticking and will steam instead of forming a crust.

Rub the entire roast—top, bottom, sides, and between the bones—with 1-2 tablespoons of oil. This helps the steak seasoning stick.

Season the prime rib generously all over with 3-4 tablespoons of coarse steak seasoning. Use a good quality steak rub like McCormick Grill Mates Montreal Steak Seasoning or your favorite blend. Make sure it’s evenly coated on all sides.

Set the seasoned roast aside while you make the herb butter.

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Step 2: Make the Herb Butter

In a medium bowl, combine 1 cup (2 sticks) of softened unsalted butter, 2 tablespoons of finely chopped fresh rosemary, 2 tablespoons of finely chopped fresh thyme, 2 tablespoons of sliced fresh chives, 6 cloves of minced garlic, 1 teaspoon of black pepper, and ½ teaspoon of kosher salt.

Mix everything together with a fork or spatula until all the herbs and garlic are evenly distributed through the butter. The butter should be soft enough to spread easily but not melted.

If your butter is too cold and hard, microwave it for 10-15 seconds to soften it slightly. If it’s too soft and melting, stick it in the fridge for a few minutes to firm up.

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Step 3: Coat the Prime Rib with Herb Butter

Use your hands or a spatula to spread the herb butter all over the prime rib. Get it on the top, sides, bottom, and in between the bones. Don’t be shy—use all the herb butter. The more you use, the more flavor you’ll have and the more drippings will fall onto the potatoes.

Make sure the herb butter is pressed into the meat so it sticks. Some of it will melt and drip off during cooking, but plenty will stay and form a delicious crust.

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Step 4: Prep the Golden Potatoes

Rinse 3 pounds of golden potatoes (Yukon Gold work great) under cold water to remove any dirt. You can leave the skins on—they add flavor and texture.

Cut any large potatoes in half so they’re all roughly the same size for even cooking. Small potatoes can stay whole.

Place the potatoes in a drip pan or roasting pan that will fit under the prime rib on your smoker.

Drizzle the potatoes with 2 tablespoons of oil and toss to coat. Season them with 1½ teaspoons of kosher salt, 1 teaspoon of black pepper, 1 teaspoon of garlic powder, and 1 teaspoon of paprika. Toss again so they’re evenly coated.

Spread the potatoes out in an even layer in the pan. They should be directly under where the prime rib will sit so they catch all the drippings.

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Step 5: Set Up the Smoker

Preheat your smoker to 250°F. Use a mild wood like oak, pecan, or cherry. You don’t want heavy smoke like hickory or mesquite—prime rib is delicate and too much smoke will overpower the beef and herb flavors.

Let the smoker preheat for about 10-15 minutes so it’s holding steady at 250°F.

Set up your smoker with a rack above the drip pan of potatoes. The prime rib will sit on this rack with the potatoes directly underneath to catch the drippings.

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Step 6: Smoke the Prime Rib

Place the herb butter-coated prime rib on the rack bone-side down. The bones act as a natural roasting rack and insulate the meat slightly, which helps it cook evenly.

Insert a leave-in probe thermometer into the thickest part of the roast, making sure you’re not touching bone. You want to monitor the internal temperature throughout the cook.

Close the smoker lid and let it smoke. Don’t open the lid constantly to check on it—just monitor the temperature through your probe.

Smoke the prime rib at 250°F until the internal temperature reaches 123-125°F for medium-rare. This usually takes about 2-3 hours for a 4-5 pound, 2-bone roast.

The potatoes will cook in the same amount of time. The drippings from the prime rib will baste the potatoes as they roast, making them incredibly flavorful.

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Step 7: Rest the Prime Rib

When the prime rib hits 123-125°F internal, remove it from the smoker immediately. Don’t let it go higher or it’ll overcook during the rest.

Transfer the roast to a cutting board. Tent it loosely with aluminum foil.

Let the prime rib rest for 10-15 minutes. During this rest, the internal temperature will rise to about 130-135°F from carryover cooking, which is perfect medium-rare. The rest also allows the juices to redistribute through the meat so they don’t all run out when you slice it.

While the prime rib rests, check the potatoes. They should be tender inside and crispy on the outside. If they need more time, leave them on the smoker while the roast rests.

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Step 8: Slice and Serve

After the prime rib has rested, remove the foil. Use a sharp carving knife to slice the roast.

You have two options:

Option 1: Bone-in ribeye steaks – Slice between each bone to create 2 thick bone-in ribeye steaks. These look impressive and give each person a bone to gnaw on.

Option 2: Boneless slices – Remove the bones by cutting along them with a knife, then slice the meat into ½-inch thick slices. This is easier to serve and gives you more control over portion sizes.

Arrange the sliced prime rib on a serving platter. Spoon some of the herb butter drippings from the potato pan over the slices.

Serve the prime rib with the golden potatoes that cooked underneath. Those potatoes are infused with all the herb butter and beef drippings—they’re as good as the prime rib itself.

Frequently Asked Questions

What temperature should I pull prime rib for medium-rare?

Pull it at 123-125°F internal temperature. During the 10-15 minute rest, carryover cooking will bring it up to 130-135°F, which is perfect medium-rare. If you cook it all the way to 130°F on the smoker, it’ll overshoot to 140°F during the rest and be medium.

Can I use dried herbs instead of fresh?

Fresh herbs work way better in the herb butter because they have more flavor and moisture. If you only have dried herbs, use about 1 tablespoon total of dried herbs (rosemary, thyme) instead of 2 tablespoons each of fresh. The flavor won’t be as bright but it’ll work.

What wood is best for smoking prime rib?

Mild woods like oak, pecan, or cherry. Avoid heavy smoke woods like hickory or mesquite—they’ll overpower the delicate beef and herb flavors. Prime rib needs subtle smoke, not aggressive smoke.

Can I cook this on a regular grill instead of a smoker?

Yes. Set up your grill for indirect heat (coals on one side, prime rib on the other) and maintain 250°F. Add wood chunks for smoke. It works the same way. Just keep the lid closed and monitor the temperature.

What if I want medium or medium-well instead of medium-rare?

For medium, pull at 135°F (it’ll coast to 140-145°F). For medium-well, pull at 145°F (it’ll coast to 150-155°F). But prime rib is best at medium-rare—cooking it further dries it out and wastes the quality of the cut.