This simple and easy recipe will show you exactly how to cook a boneless pork loin roast. I know this might be simple for some of you but we all have to start cooking somewhere and actually, the USDA has re-vamped their cooking temperature guidelines when it comes to cooking a pork roast. Did you know that we no longer have to cook pork roasts until they are shoe leather like our Moms & Grandparents did?

Yup. We now get to cook them to 145 °F.

Pork Loin Roast
Pork Loin Roast

How to Cook a Boneless Pork Loin Roast

If you want to read up on the new guidelines, head on over here.

It does take some getting used to, the fact that your pork roast will be slightly pink in the middle. The first time I made it my Mom was appalled. APPALLED. That’s the only word I can use. She couldn’t believe that I was trying to kill my family by feeding them under cooked pork.

That’s why I’m writing up this quick how-to post, because this is the NEW how to cook a boneless pork loin roast method. No shoe leather. Gravy is a delicious addition if wanted, not a necessity so that you don’t choke on a bone dry roast. Trust me, once you start treating pork more like a beef roast instead of chicken ( we all freak when chicken is pink!) you are going to love pork roasts again!

How Many Minutes Per Pound for Pork Loin?

The rule of thumb is usually 25 minutes per pound at 350 °F. This method that I use is the high heat method : you start the roast off at 450 °F for 15 minutes, sear in the juices and then turn down the oven to 300 °F. With my method you can also count on a good 20 minutes per pound AFTER the initial roasting at 450°F as the oven is going to have residual high heat for a while after you turn the oven down.

The only exception is when you have a thinner pork loin roast or a thicker one. I had a huge Costco pork loin for the photos (you have seen those suckers, right? What giant pig those came from I don’t want to know!) so my roast in these photos took 120 minutes on the low heat to cook. IF you have a thinner pork loin roast, adjust accordingly. A trick by the way for those Costco pork loins – cut them in half and freeze them separately. Or in thirds. They are so big and so cheap!

What’s the Difference Between Pork Loin and Pork Tenderloin?

Pork loin is round and flat, think of the meat as looking like a boneless pork chop. It is still round but is wide. Pork tenderloin is very round, smaller and is a literal circle when you cook it up. Tenderloin is very tender but if you cook this pork loin roast correctly it’s also an amazing dinner!

Is Pork Loin a Good Cut of Meat?

Pork loin can be overcooked and dried out easily but if you get a good roast with a fat cap on the top, that fat will help! Always choose a pork loin roast that has a lot of fat on the top, I will literally dig through those Costco roasts until I find one! I’m that person lol. Then you have to make sure that you cook it properly – using this recipe.

Tips for Roasting a Tender, Juicy Pork Loin

  • Searing in the juices at that high heat of 450°F to start is what makes this the best pork loin recipe around .Once you sear those in, you aren’t losing the moisture into the oven as badly. You then turn down the oven and cook it lower than usual, which also helps to make it a moist roast pork.
  • The butter and olive oil crust on top is really important. It helps to form a barrier on the top fat that helps keep the roast moist and also once melted provides the vegetables and the bottom of the roast with moisture.
  • Always roast a roast FAT SIDE ON TOP. Any other way is losing out on that natural, fantastic tasting juiciness that the fat cap provides. You need that fat to be dripping down the pork, why would you want to lose that?

The recipe is plain, simple and one of my favourite ways to cook up a roast. The ends are going to be well cooked – better for those people that are still having a hard time eating pink pork- but the center?

Perfection. I will never go back to eating show leather pork again! So who else has hopped on board? Did you find it a mental challenge to eat pink pork?

If you are looking for other pork recipes, try my recipes for:



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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. #pork #roast #porkloin

4.8 from 10 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
Keyword: pork loin, pork loin recipes, Pork Loin Roast
Servings: 8 servings
Calories: 467 kcal
Author: Karlynn Johnston
  • 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*
Total Fat 18g 28%
Saturated Fat 4g 20%
Cholesterol 172mg 57%
Sodium 1485mg 62%
Potassium 1271mg 36%
Total Carbohydrates 9g 3%
Dietary Fiber 4g 16%
Sugars 2g
Protein 62g 124%
Vitamin A 192.9%
Vitamin C 9.2%
Calcium 10.8%
Iron 18.6%
* Percent Daily Values are based on a 2000 calorie diet.





Hey guys, I'm Karlynn! Welcome to The Kitchen Magpie, my website full of family friendly recipes, cocktails & homesteading tales of chickens & cows from the family farm! Make sure to check out my bestselling cookbook, Flapper Pie & a Blue Prairie Sky ,stay tuned for info on my second cookbook!


  1. Edward Mathis Reply

    I am wondering how the veggies can cook without some type of liquid.

  2. Love your blog in general, but this recipe was just what I was looking for. BTW your information and notes are always very helpful. Thank you.

  3. Made this tonight and it was amazing! Perfect, tender, juicy pink in the middle pork loin! And the vegetables were delicious cooked in with the meat (I added some peppers, mushrooms and broccoli, too) Another hit from The Kitchen Magpie! Thank you!

  4. Michele A Welch Reply

    Can’t wait to try this method. In our family I grew up with a traditional Cuban/Spanish Christmas Eve meal of roast pork with black beans and rice. For a twist on the seasonings try using Mojo to marinate the pork in for about 24 hours before you cook it and then I leave some of the marinade in the pan to make an amazing gravy after.

  5. Michelle Miliaresis Reply

    Hello! Trying out this recipe and the oven is preheating. Two questions: don’t add any stock to the roasting pan or cover during cooking?
    You stated you cooked your almost 6lb roast for 90minutes? Not 120minutes? I’m want to make sure I’m not overcooking our roast… your instructions stated 20-25 mins per pound. So for my 3.6lb roast I was going to cook for 70 minutes after I dropped the oven temperature down to 300 degrees.
    Thanh you kindly! 🙂

    • Hi Michelle,

      The butter melts and pools in with the vegetables; the high temp Sears the meat, you don’t want liquid or a lid on the roast. As for the time: it depends on so many factors that the best gauge is temperature, for accuracy. My new oven holds heat so my roasts cook fast , the times are an estimate. With that small of a roast make sure your vegetables are small.

  6. Tweets-
    Add teaspoon of dried marjoram into your seasonings add an additional 2 teaspoons of pepper .I use regular iodize salt
    I have an electric Oven acooks high so I put my oven on 395 for 20 minutes and I use a dark roasting pan .
    I also sliced on diagonal the top that has the more fat on it I wish I had a picture of it because it was so tender it broke right it broke right away this was a boneless pork roast I slathered on on the top of the meat and the fat drip down on the bottom it was delicious !
    I roasted it on 295 for another hour

  7. Thsi was a hit with the family thanks for the recipe. I did more potatoes because we had 6 people to feed and it worked out great.

  8. Marcie Martin Reply

    Going to try this tonight, I can hardly wait!!! It has loads of garlic, I mean come on, if it has garlic or bacon? You know it’s going to be AMAZING!!! 🙂

  9. I tried this pork loin with rosemary and garlic. It was amazing and was beautiful to see coming out of the oven!

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