This herb crusted pork loin is one of those Sunday dinner roasts that looks impressive and tastes even better. A quick rub of melted butter and Dijon mustard locks a flavor-packed seasoning crust onto the outside, and a two-temp roast keeps the inside juicy and tender. Pantry spices, one pan, and a roast that earns its place at the table.
More pork dinners to try:
The Keys to Nailing this Recipe
A great pork loin roast comes down to three things: getting the seasoning to actually stick, pulling it from the oven at the right temp, and giving it time to rest before slicing.
✦ Coat the roast in Dijon and melted butter first. This isn’t just for flavor. It gives the spice rub something to grip onto so the crust forms instead of falling off in the pan.
✦ Press that seasoning in! Once you’ve added the seasonings, don’t be shy – press it in good!
✦ Pull it at 140°F, not 145°F. The internal temp keeps climbing while it rests. Pulling at 140°F puts you right at 145°F after a ten-minute rest, which is juicy and safe.
✦ Rest the roast for a full ten minutes. Cutting in early lets the juices run out onto the board. Ten minutes tented loosely with foil keeps every slice tender.
A Note on the Cut
Make sure you’re using a pork loin and not a pork tenderloin. They are very different cuts and generally not interchangeable in most recipes.
- This recipe is built for a 3 to 4 pound boneless pork loin roast
- Pork loin and pork tenderloin are different cuts (pork loin is the larger, wider roast; tenderloin is small and narrow). Tenderloin cooks much faster and would dry out at these times.
- If they have a smaller or larger pork loin, the temp method still works. The thermometer is what determines doneness, not the clock.
How to Make Herb Crusted Pork Loin
This roast comes together in about ten minutes of hands-on time. You mix your seasoning, brush the pork with a Dijon butter, sprinkle the rub on, and let the oven handle the rest.
1. Preheat and prep the pan
- Preheat oven to 425°F
- Line a sheet pan or baking dish with foil and lightly spray with nonstick spray (helps with easy cleanup)
2. Mix the seasoning
Combine kosher salt, black pepper, onion powder, garlic powder, Italian seasoning, dried thyme, dried rosemary, and dried parsley in a small bowl.
How about fresh herbs?
As much as I love fresh herbs, dried herbs hold their flavor through the long roast time without scorching. This dish best made with dried herbs.
3. Prep the pork loin
Pork loins come with a “fat cap”, and we need some of it! You’ll want a nice layer of fat on top to keep the pork loin juicy and flavorful while it roasts. However, if your roast comes with a particularly thick layer, use a sharp knife to trim it down to about ¼-inch thick. This leaves just enough fat to melt into the meat and provide incredible flavor and juiciness.
- Trim the fat cap to ¼ inch thick
- Pat the entire roast as dry as possible with paper towels. This helps create that nice crust we want.
4. Make the Dijon butter and coat the roast
- Microwave butter until melted (about 1 minute)
- Whisk Dijon mustard into the melted butter
- Rub the mixture all over the pork loin, including the sides and ends
- Why this step matters: the Dijon butter is the glue that holds the seasoning on the roast. Without it, the rub falls off in the pan instead of forming a crust.
From experience:
Skipping the Dijon butter is the number one reason a seasoning rub falls off a roast. Don’t skip it.
5. Apply the seasoning
- Sprinkle the seasoning mixture over the pork
- Press it gently into the Dijon butter coating
- Cover the sides and ends, not just the top
- Place fat side up on the prepared pan
6. Roast at two temperatures
- Roast at 425°F for 15 minutes, uncovered
- Reduce heat to 375°F and continue roasting uncovered for 45-60 minutes
- Total roasting time depends on roast size and starting temperature
- The thermometer is the only reliable doneness signal
Why Start at 425°F then drop to 375°F?
We start at the higher temp to help form that awesome crust. That dijon, butter and herb will quickly start forming a crust at 425°F, then the whole dish cooks perfectly at the lower temp for juicy results inside, with that awesome herb roasted crust on the outside.
7. Pull at 140°F
- Use an instant-read thermometer in the thickest part of the roast
- Pull when the internal temp hits 140°F
- The temp will climb to 145°F during the rest, which is the USDA-recommended safe temp for pork
- Pulling at 145°F means the rested roast lands closer to 150°F, which is past juicy
Use a thermometer!
The thermometer is non-negotiable. Pork loin goes from juicy to dry in about five degrees.
8. Rest before slicing
- Tent loosely with foil and rest 10 minutes
- Why rest: the juices redistribute through the meat, and the carryover cooking finishes bringing the roast to safe temp
- Slice across the grain in ½-inch slices
Serving Suggestions
Roasted pork loin works well with SO many different sides. Naturally, potatoes are an excellent choice. For a fuller Sunday dinner spread, mashed potatoes and a simple green vegetable round it out.
Storage, Freezing, Make-Ahead
- Refrigerate leftovers in an airtight container for up to 4 days
- Reheat slices gently in a covered skillet over low heat with a splash of broth or water to keep them from drying out (avoid the microwave on high power)
- Freeze sliced or whole for up to 3 months; thaw overnight in the fridge before reheating
- Make-ahead note: you can mix the dry seasoning a day or two in advance and store it in a small jar so prep is even faster on cook day
FAQs
Why did my herb crust fall off the pork loin?
The most common cause is skipping the Dijon butter layer or applying a dry rub straight to a wet roast. Pat the pork dry, apply the Dijon butter generously, and press the seasoning into the coating so it adheres.
Do I roast a pork loin covered or uncovered?
Uncovered the whole way. Covering steams the roast and prevents the crust from forming.
Can I use fresh herbs instead of dried?
Yes. Use about 1 tablespoon each of finely chopped fresh rosemary and thyme in place of the dried versions. Keep the other seasonings as-is. Flavor leans a little brighter and more savory with fresh.
Can I roast this from frozen?
no. Thaw the pork loin completely in the fridge first (24 to 48 hours depending on size). Roasting from frozen makes it nearly impossible to hit the internal temp evenly without overcooking the outside.
More Pork Dinners to Try
- Smothered Pork Tenderloin
- Slow Cooker Balsamic Pork Roast
- Oven Baked Bone-In Pork Chops
- Stovetop Balsamic Pork Tenderloin
- Grilled Pork Tenderloin
- Slow Cooker Creamy Tuscan Pork Tenderloin
Recipe
Herb Crusted Pork Loin {Juicy, Tender, and Foolproof}
Ingredients
Method
- Preheat oven to 425°F. Line a sheet pan or baking dish with aluminum foil and lightly spray with nonstick spray.
- In a small bowl, combine kosher salt, black pepper, onion powder, garlic powder, Italian seasoning, thyme, rosemary, and parsley flakes.
- Trim any excess fat from the pork loin if needed, but leave the fat cap on top. Pat the roast dry with paper towels.
- Microwave the butter in a small dish for about 1 minute, or until melted. Whisk in the Dijon mustard.
- Rub the Dijon butter all over the pork loin, covering the top, sides, and ends.
- Sprinkle the seasoning mixture over the entire roast, pressing gently to help it adhere. Get the sides and ends too.
- Place the pork fat side up on the prepared pan. Roast at 425°F for 15 minutes, uncovered.
- Reduce heat to 375°F and continue roasting uncovered for 45-60 minutes, or until the internal temperature reaches 140°F in the thickest part of the roast.
- Remove from the oven and tent loosely with foil. Let rest, undisturbed, for 10 minutes. The internal temperature will rise to 145°F.
- Slice across the grain into ½-inch slices and serve.
Notes
- Pull at 140°F, not 145°F. The roast carries over to 145°F during the rest, which is the USDA-recommended safe temp for pork.
- An instant-read thermometer is the only reliable doneness signal. Cook time varies by roast size, oven calibration, and starting temperature.
- Patting the roast dry and using the Dijon butter base is what makes the crust stick. Don’t skip either step.
- Press the seasoning firmly into the Dijon butter coating so it forms a real crust instead of falling off in the pan.
- Roast uncovered the entire time. Covering steams the roast and softens the crust.
- For fresh herbs, swap in about 1 tablespoon each of finely chopped fresh rosemary and thyme in place of the dried versions.
- This recipe is built for a 3-4 pound boneless pork loin roast. Pork tenderloin is a different cut and cooks much faster.
- Rest a full 10 minutes before slicing. Cutting in early lets the juices run out onto the board instead of staying in the meat.
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