Prime Rib Roast

If you’re scared of ruining a Prime Rib Roast, my foolproof recipe is about to change your life. Crispy crust, juicy center, perfect doneness every time, no guesswork, no stress, and zero regrets.

This is the holiday roast at our house. When I pull this prime rib out of the oven, everyone stops talking. I’m not even exaggerating. The smell alone gets people hovering in the kitchen like I’m handing out cash. And the best part? It looks and tastes like you spent all day fussing, but it’s honestly one of the easiest roasts to make if you follow the steps.

I’ve made this roast more times than I can remember, and every single time it delivers. No guesswork, no drama, just a showstopper dinner that’ll have everyone convinced you’re a total pro.

If you’ve ever wondered how long to cook prime rib, how many minutes per pound you need, or what temperature prime rib should be cooked to, I’ll walk you through everything step by step so your roast turns out perfect every time.

Prime Rib Cooking Time Chart

If you’re wondering how long to cook prime rib, the chart below will give you a good estimate based on roasting at 325°F. But my method actually starts the roast at 450°F for the first 15 minutes, then the oven temperature is lowered to 325°F for the remainder of the cooking time.

That initial blast of high heat helps create that beautiful crust on the outside of the roast, then the lower temperature lets it cook slowly and evenly so the inside stays tender and juicy.

Always rely on internal temperature more than time, but this chart will help you estimate when to start checking your roast.

Roast Size	Rare	Medium Rare	Medium
3 pounds	40 to 45 min	45 to 50 min	50 to 55 min
4 pounds	55 to 60 min	60 to 70 min	70 to 75 min
5 pounds	70 to 75 min	75 to 85 min	85 to 90 min
6 pounds	85 to 90 min	90 to 100 min	100 to 110 min
7 pounds	100 to 110 min	110 to 120 min	120 to 130 min

Important: Remove the roast from the oven about 10°F before your target temperature, because it will continue to cook while resting.

How Many Minutes Per Pound For Prime Rib

As a general rule, cook prime rib at 325°F for about 14 to 15 minutes per pound for medium rare. This is only a guideline, so always use a meat thermometer and start checking early so you don’t overcook it.

Prime Rib Roast Internal Temperature Guide

Timing is helpful, but internal temperature is what guarantees a perfectly cooked prime rib just how you like it.

Doneness	Remove From Oven At	Final Temp (After Resting)	Texture & Color
Rare	115–120°F (46–49°C)	120–125°F (49–52°C)	Cool red center
Medium Rare	120–125°F (49–52°C)	130°F (54°C)	Warm red center – ideal 👌
Medium	130°F (54°C)	135–140°F (57–60°C)	Pink center, less juicy
Medium Well	140–145°F (60–63°C)	150°F (65°C)	Slightly pink, firmer
Well Done	150°F+ (65°C+)	160°F+ (71°C+)	No pink, very firm (why though?)

Medium rare is usually considered the ideal doneness for prime rib because it stays the most tender and juicy.

• Go bone-in. The bones insulate the meat and keep it juicy. Plus, they make your roast look way more impressive on the table.
• Prime or Choice grade? Prime is ideal (hello, marbling), but Choice will still deliver. Just make sure it’s well-marbled.
• Dry-aged is a treat, not a must. If you see it and you’re feeling bougie, go for it. The flavor is unreal. But don’t stress if not.
• Ask your butcher to tie the roast. Bonus points if they cut the bones off and tie them back on. Easiest slicing ever.
• Let it come to room temp. Take the roast out 1–2 hours before cooking. Cold meat = uneven cooking. Don’t skip it.
• Pat it dry. Like really dry. This is the secret to that gorgeous crust.
• Season like you mean it. Salt, pepper, and that spiced herb butter? Don’t be shy. This is your flavor foundation.
• Use a thermometer. This isn’t a “poke and guess” situation. You want medium-rare? You need precision.
• Let it rest! Always rest your prime rib for 20 minutes, tented with foil, after roasting. The juices settle, the temp rises a bit more, and you won’t lose all that flavor on your cutting board. Trust me, worth the wait.
• How Many Ribs? Each rib serves about 2 people, so a 3 rib roast feeds 6. If you’re feeding a crowd, get more ribs. If it’s just you and your better half (or your dogs, no judgment), leftovers are prime (pun intended) for sandwiches.
• How Much Per Person? Plan for about 1 pound per person for a bone-in roast. Sounds like a lot, but between the bone and the fact that everyone will want seconds, trust me, it goes fast.

Bone-In vs Boneless Prime Rib

Bone-in prime rib tends to be more flavorful, and the bones act like insulation which helps the roast cook a little more evenly and stay juicy. It also looks more impressive when you bring it to the table.

Boneless prime rib is easier to carve and cooks a little faster, so start checking the temperature earlier if you’re cooking a boneless roast. Both work great, so don’t stress too much about it, just make sure you use a meat thermometer and cook to temperature, not just time.

Pull your roast out of the fridge and let it sit for 1 to 2 hours. Yes, it sounds annoying, but this helps it cook evenly and avoids that sad grey ring around the edges. Pat it dry with paper towels so the crust actually crusts.

Crank that oven up to 450°F (232°C) and let it fully preheat. No shortcuts. You want it blazing hot to sear the outside and lock in those juices.

In a bowl, mix the soft unsalted butter, garlic, thyme, rosemary, chili powder, cumin salt and pepper. It’ll smell like a steakhouse already. Smear this magic all over the roast, don’t be shy. Use your hands. Get it into every crevice like you’re giving it a spa day.

Toss onion wedges, garlic cloves, and herb sprigs into a large skillet or roasting pan. Set the roast on top, bone-side down. This not only flavors the drippings for your gravy, it keeps the meat lifted and lets air circulate.

Roast at 450°F (232°C) for 15 minutes to get that crust started. Drop the oven to 325°F (163°C) and keep roasting until the internal temp hits your sweet spot, 120°F (49°C) for medium rare (it’ll rise as it rests).

Pro Tip: Use a meat thermometer. Guessing is for charades, not $100 cuts of meat.

Remove the roast and tent it with foil. Let it rest for 20 minutes. Walk away. Have a glass of wine. This is when the juices redistribute, and the temp creeps up to perfection.

While to roast is resting, place the pan with the onions and drippings on the stove. Add red wine and beef broth, simmer for 5 minutes. Thicken with a quick cornstarch slurry (1 tablespoon cornstarch + 2 tablespoons water). Strain if you’re fancy. Pour it over everything if you’re not.

Use a sharp knife and cut between the bones for thick, juicy slices. Serve with that homemade gravy and watch everyone lose their minds.

How Much Prime Rib Per Person

As a general rule, plan for:

• Bone-in prime rib: about 1 pound per person
• Boneless prime rib: about ¾ pound per person

Each rib typically feeds about 2 people, so a 3-rib roast will feed about 6 people. If you want leftovers (and you do), buy a little extra.

Should prime rib be covered or uncovered?

Prime rib should be cooked uncovered so the outside develops a nice crust. Covering the roast would trap steam and prevent that beautiful browned exterior from forming.

Do you cook prime rib fat side up or down?

Cook prime rib fat side up. As the fat renders, it slowly bastes the meat while it cooks, which helps keep the roast juicy and flavorful.

How long should prime rib rest before slicing?

Let the prime rib rest for at least 20 minutes after removing it from the oven. This allows the juices to redistribute throughout the meat and the internal temperature to finish rising. If you slice it too early, all the juices will run out onto the cutting board.

Can I cook prime rib ahead of time?

Prime rib is best served fresh, but you can season it and prepare it the day before. Rub the roast with the butter or seasoning, cover loosely, and refrigerate overnight. Let it sit at room temperature for 1 to 2 hours before cooking.

If you need to cook it ahead, slightly undercook it, then gently reheat in the oven before serving.

How do you reheat prime rib without drying it out?

he best way to reheat prime rib is in the oven, not the microwave.

Place slices in a baking dish, add a splash of beef broth or gravy, cover with foil, and warm at 300°F for about 15 to 20 minutes until heated through. This keeps the meat from drying out.

You can also reheat slices gently in a covered skillet over low heat with a bit of broth or gravy.

Is bone-in or boneless prime rib better?

Bone-in prime rib tends to be more flavorful and the bones help insulate the meat while cooking, which can help it cook more evenly. Boneless prime rib is easier to carve and cooks slightly faster. Both work great, so choose whichever you prefer and cook to internal temperature rather than strictly by time.

Carving Tips

Let it rest fully first, 20 minutes minimum. Then:

• Run your knife along the bones to remove the roast from the rack.
• Slice against the grain into thick or thin slices, your roast, your rules.
• Spoon gravy over the top, pat yourself on the back, and accept your compliments graciously.

Storage + Reheating

Leftovers? Lucky you. Prime rib holds up beautifully if you treat it right.

• Fridge: Store slices in an airtight container for up to 4 days. Keep any leftover gravy in a separate container.
• Freezer: Wrap individual slices tightly in plastic wrap, then foil, and pop into a freezer bag. Good for up to 3 months. Thaw overnight in the fridge before reheating.

How to Reheat Without Drying It Out:

• Oven: Place slices in a baking dish, add a splash of broth, cover with foil, and warm at 300°F (150°C) for 15–20 minutes.
• Stovetop: Gently reheat slices in a covered skillet over low heat with a bit of gravy or broth.

Pro Tip: Never reheat prime rib in the microwave unless you’re okay turning that juicy roast into leather. You’ve been warned.