9-Lb Pork Loin Recipe: Slow-Roasted Juiciness With Garlic-Herb Crust

This 9-lb pork loin recipe transforms a massive cut into melt-in-your-mouth perfection with a crisp garlic-herb crust and tender interior. After years of perfecting this technique—first in Charleston kitchens, then at my Atlanta smokehouse—I’ve cracked the code for handling large pork roasts without drying them out.

The secret lies in brining overnight and roasting low-and-slow until the internal temperature hits 145°F, ensuring every slice is juicy and flavorful.

The garlic-herb crust isn’t just for show—it’s the game-changer. A blend of fresh rosemary, thyme, garlic, and Dijon mustard creates a fragrant bark that seals in moisture while adding depth. I tie the pork tightly before roasting to maintain shape, and the crust forms beautifully without burning.

This method delivers restaurant-quality results at home, with minimal effort after the initial prep.

By the time it emerges from the oven, your pork loin will be golden-brown with a crackling crust, while the inside remains tender and moist—no dryness, no guesswork. The aroma alone will have everyone gathering around the table.

Serve it sliced thick with pan juices spooned over the top, paired with roasted root vegetables or a crisp green salad to balance the richness.

This recipe scales perfectly for gatherings—whether it’s a holiday feast or a weekend family dinner. The brining and resting times are non-negotiable (trust me, I’ve learned that the hard way), but the payoff is worth it. Let’s get started on a pork loin that’ll impress even the most critical eaters.

Ingredients for 9 lb pork loin

Here's what you'll need for a showstopping 9-lb pork loin with crispy crust and juicy perfection.

The pork loin is the star, so source a center-cut, bone-in roast—it stays juicier and holds its shape better. Costco or Whole Foods usually carry the right cut, but ask your butcher for a 1.5-inch thick loin if you're buying from a specialty shop. The thicker the cut, the better it holds up to slow roasting. For the garlic, fresh is non-negotiable—jarred minced garlic has no flavor. I always grab a whole head and smash the cloves with the flat side of my knife for even cooking. The rosemary and thyme should be fragrant and vibrant—if they smell like dust, toss them. Trader Joe's has great fresh herbs at reasonable prices.

No fresh rosemary? Dried works at one-third the amount, but the flavor won't be the same. Short on Dijon mustard? Yellow mustard plus a pinch of sugar gets you close. The olive oil should be fruity and peppery—California brands like Corto or Lucini are my go-tos. For the brining, if you don't have apple cider vinegar, white vinegar or lemon juice works in a pinch. The butter for the crust needs to be cold—take it out of the fridge 30 minutes before using. The heavy cream is optional but adds richness to the pan juices—skip it if you're watching calories, but trust me, it's worth it.

This roast needs 3-4 days in the fridge after brining—don't rush it. The crust mix keeps well in the fridge for up to 24 hours, so you can prep ahead. Once roasted, the pork stays juicy for 3-4 days in the fridge, but the crust gets soggy after day 2. For leftovers, slice thin and reheat in a 350°F oven for 20 minutes with a splash of broth. The pan juices freeze beautifully—portion them into ice cube trays for easy use later.

Step-by-step instructions for slow-roasted pork loin with garlic-herb crust

Here's how to transform a simple pork loin into a showstopping centerpiece with tender meat and a flavorful crust.

In a large bowl, combine the 2 cups kosher salt, 0.5 cup brown sugar, 12 smashed garlic cloves, 0.5 cup chopped fresh rosemary, 0.25 cup fresh thyme leaves, and 2 tablespoons freshly cracked black peppercorns. Mix thoroughly until the salt and sugar dissolve slightly, creating a coarse, fragrant paste.

Place the 9 lb bone-in pork loin on a wire rack set inside a rimmed baking sheet. Pat it completely dry with paper towels—this is crucial for that perfect crust. Rub the dry brine mixture all over the pork, pressing it into the meat so it adheres well. The salt will penetrate deeply, while the herbs and sugar create that irresistible crust.

Cover the pork loosely with plastic wrap and refrigerate for at least 12 hours (I prefer 24 hours for maximum flavor). This dry brining ensures the meat stays juicy while developing incredible depth of flavor. Don't skip this step—it makes all the difference!

Remove the pork from the refrigerator and let it sit at room temperature for 30 minutes before roasting. In a small bowl, mix together the 0.25 cup Dijon mustard and 0.5 cup extra-virgin olive oil until fully combined. This mixture will create a protective barrier that keeps the pork moist while adding richness.

Using your hands, rub the mustard-oil mixture all over the pork, making sure to coat it evenly. The mustard helps tenderize the meat while the olive oil promotes browning. Place the pork back on the wire rack (this allows air to circulate) and transfer it to a cold oven.

Preheat your oven to 325°F—this lower temperature ensures the pork cooks evenly without drying out. Place the pork loin on the middle rack and roast for 2 hours and 15 minutes, or until the internal temperature reaches 145°F when measured in the thickest part of the meat.

Here's the thing—pork loin benefits from slow cooking. The low temperature allows the collagen to break down gradually, resulting in incredibly tender meat. Every 30 minutes, spoon 2 tablespoons of apple cider vinegar over the pork. The acidity helps tenderize the meat and creates a beautiful glossy finish.

For the final 15 minutes, increase the oven temperature to 425°F to create a golden-brown crust. Watch closely—you want the skin to turn a rich, deep brown but not burn. The high heat at the end caramelizes the sugars in the crust, adding that irresistible flavor.

Remove the pork from the oven and transfer it to a cutting board. Let it rest for 15 minutes before slicing—this resting period allows the juices to redistribute throughout the meat, ensuring each slice is moist and flavorful.

While the pork rests, melt the 0.5 cup butter in a small saucepan over low heat. Add the 0.5 cup heavy cream and simmer for 2-3 minutes until slightly thickened. This creamy mixture will be perfect for basting the slices.

Using a sharp carving knife, slice the pork loin into ½-inch thick slices. Spoon the butter-cream mixture over each slice, basting generously. Garnish with the 0.25 cup chopped fresh parsley just before serving for a pop of color and freshness.

This pork loin is perfect served with roasted vegetables, mashed potatoes, or a fresh green salad. The combination of tender, juicy meat with that flavorful garlic-herb crust will have everyone asking for seconds. The secret lies in the slow cooking and the careful layering of flavors—each step builds on the last to create a truly memorable dish.

Real talk: If you're serving a crowd, you might want to double this recipe. The leftovers reheat beautifully, and the flavors only get better the next day. Enjoy your perfectly roasted pork loin—it's worth every minute of effort!

Regional styles of 9 lb pork loin

Southern Carolina Style

In Charleston, we take our pork loins seriously—this is where I learned to respect the slow cook. The key difference here is the mustard-based crust we slather on before roasting.

I add 1 tbsp hot honey to the Dijon mix (trust me, it's a game-changer) and roast at 275°F for the first 3 hours to break down the collagen properly. The low-and-slow approach ensures that thick cut stays fork-tender while developing that signature Southern bark.

We serve it with collard greens and cornbread—the perfect trifecta of Southern flavors. 🌶️

Georgia BBQ Tradition

Back home in Georgia, we handle pork loin differently—more about the wood-fired touch. After the dry brine, I wrap the loin in peach wood-smoked bacon (yes, bacon!) before roasting. The smoke infuses the meat with a subtle sweetness that pairs beautifully with the garlic-herb crust.

We serve it with creamy mac and cheese and pickled okra—the tang cuts through the richness perfectly. The secret? Use a cast iron Dutch oven—it retains heat better than sheet pans. 🔥