Grill a pork loin with two-zone heat, cook to 145°F with a 3-minute rest, then slice across the grain.
You came here for a straight path to juicy, blush-pink pork loin on a backyard grill. The method is simple: set up two heat zones, season well, track internal temperature, and pull the roast at 145°F before a short rest. If you’ve ever asked, “how do you cook a pork loin on the grill?”, the playbook below gives you times, temps, and fixes that work on gas and charcoal.
What Pork Loin Is (And What It’s Not)
Pork loin is the larger, lean roast from the back. It’s not pork tenderloin. The tenderloin is slim and cooks fast like a thick sausage; the loin is a roast, usually 2–4 pounds, shaped like a small log with a fat cap. Treating a loin like chops dries it out. Treating it like a roast—gentle heat, then a short sear—keeps it moist.
Grill Setup And Key Variables
Success starts before you light the grill. Choose the right cut, create a two-zone fire, and give yourself a thermometer target. The table below puts the main variables in one place.
| Item | Recommendation | Why It Matters |
|---|---|---|
| Cut | Center-cut pork loin roast | Even shape for steady cooking |
| Weight | 2–4 lb | Fits most kettles and gas grates |
| Trim | Leave thin fat cap | Self-bastes and protects the meat |
| Grill Setup | Two-zone heat | Roast on cool side, finish on hot side |
| Indirect Temp | 300–350°F lid temp | Gently cooks the interior |
| Target Pull | 145°F in center | Safe and juicy when rested |
| Rest Time | 3–10 minutes | Carryover finishes and juices settle |
| Tools | Probe or instant-read | Removes guesswork |
| Finish | Quick sear | Crust without overcooking |
Cooking A Pork Loin On The Grill: Time, Temp, Setup
Two-zone heat means one hot side and one cool side. On a gas grill, light one side and leave the other off. On a charcoal kettle, bank lit coals to one half and set a drip pan on the empty side. Close the lid to stabilize the dome around 300–350°F. This steady zone lets the roast climb to temp without scorching.
How Do You Cook A Pork Loin On The Grill? Step-By-Step
1) Season And Preheat
Pat the roast dry. Salt on the early side if you can—at least 45 minutes before grilling or the night before in the fridge. Add pepper, garlic powder, and a light brush of oil. Preheat the grill to a steady two-zone setup. Place a small foil pan under the cool side to catch drips and keep flare-ups away from the meat.
2) Start On Indirect Heat
Set the loin fat-cap up on the cool side. Insert a probe if you have one. Close the lid. Hold 300–350°F dome temp. Plan on roughly 20–25 minutes per pound to reach the low 130s in the center. Dome swings happen; the probe keeps you honest.
3) Track Temperature, Not The Clock
When the center hits 130–135°F, shift to the hot side. Sear two to three minutes per side to build color. Flip to keep the fat from dropping into one spot. Keep the lid down between flips to steady heat and smoke.
4) Pull At 145°F And Rest
Move the roast to a board when the thickest point reads 145°F. Tent loosely with foil. Rest at least three minutes; five to ten helps carryover and moisture. The 145°F target with a short rest aligns with current food-safety guidance for whole cuts of pork.
5) Slice Across The Grain
Turn the roast so the long fibers run left-to-right. Slice across those lines into 1/2-inch slabs. If the end slices look a bit more done, stack those for sandwiches and keep the center slices for plates.
Why 145°F Works For Pork Loin
Pork loin is lean, so overshooting dries it out. The 145°F target with a short rest keeps texture tender while meeting safety needs for whole cuts. This temp is now the standard from U.S. food-safety agencies and pork industry guidance, replacing the old 160°F rule for roasts and chops. A reliable thermometer is your guardrail.
Gas And Charcoal Notes
Gas Grill
Set one burner bank to medium-high, leave the others off. Aim for 300–350°F under the lid on the cool side. Place the roast over the unlit burners, fat-cap up. When the center climbs into the 130s, move over the lit burners to sear until 145°F.
Charcoal Kettle
Bank a full chimney of lit coals to one half with a foil pan on the empty side. Vents half-open to start. Lid on. Adjust vents to hold the range. Add a few briquets after 45–60 minutes if the dome dips.
Simple Rubs And Quick Wet Options
Salt and pepper alone give clean flavor. Want a little more? Try a 60:40 mix of brown sugar and kosher salt with black pepper and paprika. Or whisk oil, minced garlic, Dijon, and chopped herbs into a paste and smear a thin coat. For a wet shortcut, use a bottled Italian dressing as a one-hour marinade, then pat dry and season with salt and pepper before grilling.
Wood Smoke, If You Want It
Pork loin takes smoke fast because it’s lean. Use one or two small chunks of apple or cherry on the charcoal side, or a foil packet of chips over a lit gas burner. Keep it light so the roast stays balanced.
When Should You Brine?
A quick brine helps margin for error on thinner loins. Dissolve 1/4 cup kosher salt in 4 cups cold water. Submerge the roast 60–90 minutes, then rinse, dry, and season. Skip sugar in the brine if you plan a hot sear to avoid scorching.
Timing Guide And Carryover
Times vary with thickness, start temp, wind, and grill design. Use the guide below as a planning aid, then trust the probe. Carryover on a medium roast is usually a few degrees, which the short rest handles.
| Weight | Cook Time At 300–350°F | Notes |
|---|---|---|
| 2 lb | 45–60 min indirect + 4–6 min sear | Check at 40 min |
| 2.5 lb | 60–75 min indirect + 4–6 min sear | Probe early |
| 3 lb | 70–90 min indirect + 4–6 min sear | Stable dome helps |
| 3.5 lb | 85–105 min indirect + 4–6 min sear | Add a few coals mid-cook |
| 4 lb | 95–115 min indirect + 4–6 min sear | Rotate once for even color |
| Thick end | Runs slower | Slice tip off to even shape |
| Thin end | Runs faster | Face thin end away from heat |
Troubleshooting And Fixes
Dry Texture
If it tastes dry, you likely pushed past 145°F or let the lid temp ride high. Fix the next cook by brining, holding the dome in range, and pulling sooner. Thin slices with a drizzle of warm pan juices or a quick butter-herb sauce can save this batch.
Gray Bands Near The Edge
That ring comes from high heat early. Start indirect. Build color at the end with a short sear.
Flare-Ups
Fat drips off the cap during the sear. Keep the sear short, lid down between flips, and tongs in hand. If flames lick up, shift back to the cool zone until they settle.
Uneven Cooking
Tuck or tie a thin tail if your roast has one. Rotate halfway through the indirect phase. Place the thick end closer to the heat source during the sear to balance it out.
Slice, Sauce, Serve
After the rest, slice across the grain into 1/2-inch slabs. Spoon on a little butter and herbs, a light mustard pan sauce, or a fruit-forward glaze like apple or apricot thinned with a splash of vinegar. Keep sauces warm, not piping hot, so they don’t tighten the meat on contact.
Leftovers And Reheat
Chill slices flat in a single layer, then stack with parchment once cold. For reheating, steam covered in a skillet with a spoon of broth until just warm, or lay slices over rice and cover until the steam brings them back. Cold slices make great sandwiches with pickles and sharp mustard.
Quick Reference: Gear That Helps
- Instant-read thermometer for spot checks
- Probe thermometer for the climb
- Foil pan for drips and stable temps
- Long tongs and heat-safe gloves
Answering The Big Question One More Time
If a friend texts, “how do you cook a pork loin on the grill?”, send them this: season, set two zones, roast at 300–350°F to the low 130s, sear to 145°F, rest three minutes, slice across the grain. Clean, repeat, enjoy.
