How Long to Cook Pork Tenderloin on a Pellet Grill

Pork tenderloin on a pellet grill is a lean, mild pork roast seasoned with a simple spice rub and cooked over wood pellets for a gentle smoky flavor. At 250°F (121°C), a 1- to 1½-pound tenderloin usually takes about 55 to 70 minutes to smoke before a quick, hot sear; use a thermometer rather than the clock to decide when it is done.

Ingredients

1 pork tenderloin, 1 to 1½ pounds (450 to 680 g), with silverskin trimmed
1 tablespoon olive oil (15 ml)
1 teaspoon fine salt (6 g)
½ teaspoon freshly ground black pepper (1 g)
1 teaspoon garlic powder (3 g)
1 teaspoon smoked paprika (2 g)
1 tablespoon packed light brown sugar (12 g)
½ teaspoon mustard powder (1 g)

Instructions

Prepare the tenderloin. Pat the pork dry with paper towels. If a thin, shiny strip of silverskin remains, slide a small sharp knife just beneath it and trim it away without removing much meat; silverskin can tighten as it cooks. Tuck any very thin tail under itself and tie it loosely with kitchen twine if needed so the roast is closer to an even thickness. This helps the thinner end avoid drying out while the center cooks.
Season the pork. Stir together the salt, pepper, garlic powder, smoked paprika, brown sugar, and mustard powder. Rub the tenderloin all over with the olive oil, then press the spice mixture onto every side. The sugar helps the outside brown, but it can scorch over very high heat, so do not leave the pork unattended during the sear. If you have time, season it just before cooking; a long marinade is not necessary.
Preheat the pellet grill. Fill the hopper with pellets and preheat the grill to 250°F (121°C), following the manufacturer’s instructions. Apple or cherry pellets give a mild, slightly sweet smoke; hickory is more pronounced. Allow about 15 minutes for the grill to preheat, though the time can vary by model and weather. Clean the cooking grate and place a drip pan beneath it if your grill’s setup allows.
Smoke until nearly done. Set the tenderloin on the grate, close the lid, and cook at 250°F (121°C). Start checking the center after about 45 minutes; many tenderloins of this size take roughly 55 to 70 minutes to reach 125 to 130°F (52 to 54°C), but thickness, starting temperature, grill behavior, and wind all affect the timing. Insert an instant-read thermometer into the thickest part from the side, avoiding the grate. Keep the lid closed between checks so the grill temperature stays steady.
Raise the heat and sear. Increase the grill setting to 450 to 500°F (232 to 260°C) and allow about 10 minutes for it to heat up. Turn the pork every minute or two as it sears, checking the temperature frequently. A tenderloin may need about 4 to 6 minutes total, but the thermometer—not the color or a fixed sear time—is the guide. If your pellet grill cannot get this hot, sear the pork in a preheated heavy skillet over medium-high heat, turning it to brown each side.
Check for safe doneness and rest. Remove the pork when the thickest part reaches 145°F (63°C); the USDA FSIS safe minimum for whole cuts of pork is 145°F (63°C), followed by at least a 3-minute rest. Rest this tenderloin for 5 minutes on a clean cutting board, then slice across the grain into medallions. Juices may appear faintly pink even when pork has reached the safe temperature, so rely on the thermometer rather than color.

Tips

Check which cut you have. Pork tenderloin is a narrow, small muscle that commonly weighs about 1 to 1½ pounds (450 to 680 g). Pork loin is much larger and thicker, so it will not follow this timing; check the label and cook by internal temperature. If the package contains two tenderloins, they can cook at different rates, so check each one separately.

Adjust salt for the type you use. This recipe calls for fine salt. If using coarse kosher salt, its volume-to-weight ratio varies considerably by brand; weigh it when possible or use a little less by volume, then season to taste at the table. The brown sugar can be omitted for a less sweet rub, though the crust will brown a little differently.

Keep the thermometer clean. Wash the probe after checking undercooked pork and before using it again to check the final temperature. Insert it into the thickest section, not the narrow end, and take a second reading if the roast is uneven. Pellet grills can have hotter spots, so rotate the tenderloin if one side is browning faster.

Avoid cooking by time alone. The stated range is a planning estimate, not a promise. Cold weather, a tenderloin straight from the refrigerator, or a grill that runs below its displayed temperature can add time. Starting to check early prevents overshooting 145°F (63°C), which can make this lean cut dry.

Serving Suggestions

Slice the rested tenderloin into medallions and spoon any juices from the cutting board over the meat. Serve it with grilled or roasted vegetables, baked potatoes, rice, or a crisp cabbage slaw. A tart apple relish, mustard sauce, or barbecue sauce works well alongside the smoke without hiding the mild pork flavor. For a simple plate, add a green salad and warm rolls; for a more substantial dinner, pair the pork with mashed potatoes and green beans.

If serving a group, keep the tenderloin whole until close to mealtime and slice it just before bringing it to the table. Thin slices are convenient for sandwiches, while thicker medallions stay especially juicy on a dinner plate. Offer sauce on the side so each person can choose how much to add.

Variations

Herb and citrus: Replace the smoked paprika and mustard powder with 1 teaspoon dried thyme (about 1 g) and the finely grated zest of 1 lemon (about 2 g). The lemon zest brightens the rub, while the grill still provides the smoke. Serve with lemon wedges rather than adding lemon juice to the raw pork well ahead of time.

Chili-spiced: Add ½ teaspoon ground cumin (about 1 g) and ¼ teaspoon cayenne (about 0.5 g) to the listed rub. This gives the pork a warm, gently spicy edge; increase the cayenne only if everyone at the table enjoys more heat. A spoonful of plain yogurt mixed with lime juice makes a cool accompaniment.

Maple finish: For a sweeter glaze, brush 1 tablespoon maple syrup (15 ml) over the pork during the final minute of searing, turning once. Do not brush it on during the full low-temperature smoke because the sugars can darken too much. Maple syrup can replace the brown sugar in the rub, but use a light coating so the surface does not become sticky before it browns.

Skip the sear: You can cook the tenderloin at 250°F (121°C) until the thickest section reaches 145°F (63°C), then rest it for at least 3 minutes. This is simpler and keeps the grill at one temperature, but the exterior will be less deeply browned. The time to reach the target varies, so begin checking well before the expected finish.

Storage and Reheating

Refrigerate leftover pork within 2 hours of cooking, in a shallow airtight container. Store it for 3 to 4 days in the refrigerator. For longer storage, freeze sliced or whole portions in a freezer-safe, airtight package; use within about 2 to 3 months for best quality. Thaw frozen pork in the refrigerator rather than leaving it at room temperature.

To reheat without drying it out, place slices in a covered oven-safe dish with a spoonful of broth or water and warm in a 300°F (149°C) oven. You can also reheat a small portion gently in a covered skillet over low heat. Heat leftovers to 165°F (74°C), the USDA FSIS recommendation for reheated leftovers, checking the center with a food thermometer. Reheat only the amount you plan to eat, since repeated warming can make the meat less tender.

Frequently Asked Questions

How long does pork tenderloin take on a pellet grill at 250°F?

A 1- to 1½-pound (450 to 680 g) tenderloin commonly takes about 55 to 70 minutes at 250°F (121°C) to reach 125 to 130°F (52 to 54°C), then a few minutes of searing to reach 145°F (63°C). Grill models, roast thickness, and outdoor conditions change the timing. Start checking early and use the internal temperature as your final measure.

Should I cook pork tenderloin at 225°F or 250°F?

Either temperature works if you monitor the internal temperature. At 225°F (107°C), cooking generally takes longer and the smoke flavor has more time to develop; at 250°F (121°C), the roast usually gets through the low-temperature stage sooner. This recipe uses 250°F (121°C) as a practical balance of steady smoking and manageable timing.

Do I need to sear pork tenderloin after smoking it?

No. Searing is optional, but it adds a browned exterior and a little extra texture. You can instead smoke the pork until it reaches 145°F (63°C) and rest it. If you sear, keep checking the center so the roast does not cook far beyond the safe minimum while the outside browns.

Can I put frozen pork tenderloin on the pellet grill?

For this recipe, thaw the tenderloin completely in the refrigerator before seasoning and grilling. A frozen or partly frozen center makes cooking time harder to predict and can leave the outside overcooked before the middle is ready. Once thawed, pat it dry and follow the recipe, checking the thickest part with a thermometer.

Why is my smoked pork tenderloin dry?

The most common reason is cooking past the target temperature: tenderloin is lean and can dry out quickly when overcooked. Check it early, use a thermometer in the thickest part, and let it rest for 5 minutes before slicing. Cutting across the grain and serving the slices with their resting juices or a sauce also helps keep each portion pleasant to eat.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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