There was a time when I avoided cooking pork loin in the slow cooker because I was convinced it would turn out dry. Pork loin has a bit of a reputation for being unforgiving, and after one disappointing roast years ago, I almost gave up on it completely. Then I made a few small changes—nothing complicated—and everything clicked.
Now it’s one of those meals I come back to whenever I want something comforting without spending the whole afternoon in the kitchen. The slow cooker does most of the work, while the pork becomes tender enough to slice easily without falling apart. The juices left in the pot are just as good as the meat itself, especially spooned over mashed potatoes or rice.
If you’re making pork loin in a crock pot for the first time, don’t overthink it. This recipe isn’t about fancy ingredients or complicated techniques. It’s about letting simple flavors and a little patience do their job.
Quick Info
Difficulty: Easy
Prep Time: 15 minutes
Cook Time: 6–7 hours on LOW (or 3½–4 hours on HIGH)
Total Time: About 6 hours 15 minutes
Servings: 6–8
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Ingredients for slow cooker pork tenderloin
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Instructions
- Pat the pork loin dry with paper towels before doing anything else. It might seem like a tiny step, but removing the extra moisture helps the seasonings stick much better. I’ve skipped this before when I was in a hurry, and the seasoning never formed that flavorful coating I was hoping for.
- In a small bowl, combine the 1 teaspoon smoked paprika, 1 teaspoon garlic powder, 1 teaspoon onion powder, 1 teaspoon dried thyme, 1 teaspoon kosher salt, and ½ teaspoon black pepper. Stir everything together, then rub the mixture generously over every side of the pork loin. Don’t worry if it doesn’t look perfect—the seasoning will blend beautifully while it cooks.
- Heat 1 tablespoon olive oil in a large skillet over medium-high heat. Once the oil is hot, place the pork loin in the pan and sear it for about 2 minutes on each side until lightly browned.
- Technically, you can skip this step if you’re short on time. I’ve done that on busy weekdays and dinner still turned out great. But whenever I have an extra few minutes, I always brown the meat first. It adds a richer flavor that you really notice once everything has finished cooking.
- Scatter the sliced onion across the bottom of your slow cooker, then add the 4 minced garlic cloves. This creates a simple base that keeps the pork from sitting directly on the bottom while also adding plenty of flavor to the cooking juices.
- Place the browned pork loin on top of the onions. In a measuring jug, whisk together 1½ cups chicken broth, 1 tablespoon Worcestershire sauce, and 1 tablespoon Dijon mustard until smooth, then carefully pour the mixture around the pork rather than directly over it. I learned the hard way that pouring it over the top can wash away some of the seasoning you just added, so I always pour it around the sides instead.
- Cover the slow cooker with the lid and cook on LOW for 6 to 7 hours. If you’re short on time, you can cook it on HIGH for about 3½ to 4 hours, although I almost always choose the low setting. The texture is noticeably more tender, and the meat stays juicier.
- One of the hardest parts is resisting the temptation to keep lifting the lid to check on everything. I used to do this almost every hour until I realized each peek lets out a surprising amount of heat. Now I simply leave it alone and let the slow cooker do exactly what it’s designed to do.
- After about 6 hours, start checking the internal temperature with a meat thermometer rather than relying only on the clock. You’re looking for 145°F (63°C) in the thickest part of the pork. Every roast is a little different, and even two pork loins of the same size can finish at slightly different times. The thermometer takes the guesswork out of it.
- Once the pork reaches the right temperature, transfer it to a cutting board and loosely cover it with foil. Let it rest for 10 to 15 minutes before slicing. I know it’s tempting to cut into it straight away—especially because the kitchen smells incredible by this point—but those few extra minutes really help the juices stay inside the meat instead of running onto the board.
- While the pork is resting, don’t throw away the cooking liquid. That’s where a lot of the flavor ends up. If you’d like a simple gravy, pour the juices into a small saucepan and bring them to a gentle simmer over medium heat.
- In a small bowl, stir together 1 tablespoon cornstarch and 2 tablespoons cold water until completely smooth. Slowly whisk the mixture into the simmering cooking juices. Keep stirring for 2 to 3 minutes until the gravy thickens slightly. It doesn’t need to be heavy—just thick enough to coat the back of a spoon.
- Slice the pork against the grain into pieces about ½ inch thick. This makes a surprising difference to the texture. The first time I made pork loin, I sliced it with the grain without thinking and couldn’t understand why it felt a little chewy. Since then, I always take an extra few seconds to look at the direction of the muscle fibers before slicing.
- Arrange the slices on a serving platter and spoon some of the warm gravy over the top. Serve the rest on the side so everyone can help themselves. I usually pair this with mashed potatoes because they soak up every bit of the sauce, but roasted vegetables, buttered green beans, rice, or even a simple garden salad work just as well.
- If you happen to have leftovers, they reheat surprisingly well. I actually think the flavor is even better the next day after the pork has had time to sit in its juices overnight. Thin slices also make fantastic sandwiches with a little Dijon mustard or cranberry sauce.
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A Quick Note
The biggest mistake people make with pork loin is confusing it with pork tenderloin. They sound similar, but they’re completely different cuts of meat. This recipe is designed for a pork loin roast, which is larger and holds up beautifully in a slow cooker. If you use pork tenderloin instead, it will cook much faster and can easily become overdone.
FAQ
Can I cook pork loin from frozen in a crock pot?
I wouldn’t recommend it. Frozen meat spends too long in the temperature danger zone before it starts cooking properly. For the best texture and food safety, thaw the pork completely in the refrigerator before using this recipe.
Can I skip browning the pork first?
Yes. If you’re short on time, you can place the seasoned pork directly into the slow cooker. The recipe will still work, but browning adds a richer, deeper flavor that I think is worth the extra few minutes whenever possible.
How should I store leftovers?
Store cooled pork and its cooking juices in an airtight container in the refrigerator for up to 4 days. Reheat gently with a splash of broth to help keep the meat moist.
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