4.93 from 53 votes
Buttery Garlic Rosemary Pork Loin Roast Recipe
Prep Time
5 mins
Cook Time
1 hr 30 mins
Total Time
1 hr 35 mins

How to Cook a Boneless Pork Loin Roast from start to finish! This roast pork recipe has a delicious crispy garlic butter exterior and a perfectly cooked interior. 

Course: Main Course
Cuisine: American
Servings: 8 servings
Calories: 467 kcal
  • 1 4-5 lb boneless pork loin roast
  • 1/4 cup butter softened
  • 1/4 cup olive oil
  • 7 garlic cloves minced
  • 1 1/2 tbsp coarse sea salt
  • 3 Tbsp. chopped fresh rosemary
  • 1 tsp. freshly ground black pepper
  • 1-2 lbs of chopped carrots.potatoes and onions see notes for sized
  1. Preheat your oven to 450° F.
  2. In a small bowl, combine the butter, oil, garlic, rosemary, salt and pepper, and mix until a paste forms.

  3. Pat the pork roast with a paper towel to remove excess moisture and then rub 2/3 of the seasoning mixture onto the roast, covering the top and sides.
  4. Place the roast in the bottom of a large roaster.
  5. Place desired vegetables around the roast. Dab the remaining seasoning mixture over the vegetables.
  6. Roast in the pre-heated oven for 15 minutes, then turn the oven temperature down to 300° F.  Do not open the oven! 

  7. Let the roast continue to roast for another 20-25 minutes per pound of meat, around 100 minutes or until the internal temperature reaches 140° F when a meat thermometer is inserted into the middle.  

  8. Remove the roast from the oven and cover it with foil. Let it rest 10 minutes, then slice and serve.
Recipe Notes

New USDA recommendations are that pork can now be safely cooked to 145 °F.

The vegetables should be cut as small as you see in my photo, my roast cooked for 90 minutes as it was almost 6 pounds.

Carrots should be no wider than 1/2 inch, potatoes should be cut around 1/2 inch thick to ensure that they are cooked by the end of the roasting time. Smaller  sized vegetables will cook better.


Nutrition Facts
Buttery Garlic Rosemary Pork Loin Roast Recipe
Amount Per Serving
Calories 467 Calories from Fat 162
% Daily Value*
Fat 18g28%
Saturated Fat 4g20%
Cholesterol 172mg57%
Sodium 1485mg62%
Potassium 1271mg36%
Carbohydrates 9g3%
Fiber 4g16%
Sugar 2g2%
Protein 62g124%
Vitamin A 9645IU193%
Vitamin C 7.6mg9%
Calcium 108mg11%
Iron 3.3mg18%
* Percent Daily Values are based on a 2000 calorie diet.