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5.0 from 147 votes

Slow Roasted Prime Rib

This tender Slow Roasted Prime Rib is the perfect centerpiece for a holiday dinner. Using a reverse-sear method creates a juicy and tender roast with a crisp outer crust.

Prep Time
10 hrs 30 mins
Cook Time
3 hrs 30 mins
Total Time
14 hrs 5 mins
Servings: 6 to 10 people
Calories: 541 kcal
Course: Main Course
Cuisine: American

Ingredients

  • 6 to 12 pound standing rib roast (bone-in prime rib)
  • Kosher or sea salt
  • freshly-cracked black pepper
  • Roasted Garlic Horseradish Cream Sauce (optional, for serving)

Instructions

    Cup of Yum
  1. For ease in carving, ask your butcher to cut the meat off of the ribs and chine (backbone) and tie it back on.
  2. The day before you plan to roast your prime rib, season it liberally on all sides with salt and pepper. Place the roast on a heavy baking sheet with the fat cap side up and refrigerate, uncovered, overnight (or up to 24 hours).
  3. Remove the prime rib from the refrigerator and let stand at room temperature for 2 hours before roasting.
  4. Preheat oven to 250°F with the rack in the lower third of the oven. Place prime rib on a v-rack in a roasting pan with the fat-cap side up. 
  5. Roast until an instant-read thermometer inserted into the thickest part of the meat (away from the bone) reads 120-125°F for rare, 128-130°F for medium-rare, or 132-135°F for medium and medium-well. This will take 3-4 hours.
  6. Remove the prime rib from the oven, tent with foil, and let rest for 30 minutes.
  7. Increase oven temperature to 500°F. Uncover the roast and sear it in the oven for 5-10 minutes, until the exterior is brown with a crisp crust.
  8. Carve the prime rib and serve with Roasted Garlic Horseradish Cream Sauce on the side. 

Notes

  • *The prime rib photographed in this post was a 4-rib roast weighing 11 pounds. It was cooked to an internal temperature of 120°F in about 3 hours and 20 minutes.
  • Especially when slow roasting at a low temperature, it's important to confirm that your oven is running true to temperature with a reliable oven thermometer before you get started. Read how to test it with this article from Fine Cooking.

Nutrition Information

Calories 541kcal (27%) Protein 24g (48%) Fat 48g (74%) Saturated Fat 20g (100%) Cholesterol 109mg (36%) Sodium 80mg (3%) Potassium 400mg (11%) Calcium 14mg (1%) Iron 2.6mg (14%)

Nutrition Facts

Serving: 6to 10 people

Amount Per Serving

Calories 541

% Daily Value*

Calories 541kcal 27%
Protein 24g 48%
Fat 48g 74%
Saturated Fat 20g 100%
Cholesterol 109mg 36%
Sodium 80mg 3%
Potassium 400mg 9%
Calcium 14mg 1%
Iron 2.6mg 14%

* Percent Daily Values are based on a 2,000 calorie diet.