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Pork tenderloin is lean, narrow, and unforgiving once it overshoots doneness by even five degrees. Grill time depends less on total weight and more on the diameter of the muscle, and on whether you’re cooking it over direct flame or on a two-zone setup. Here’s the number, then the table that actually accounts for both.
Quick answer: A whole pork tenderloin takes roughly 15 to 25 minutes on a 400F to 450F grill, turned every few minutes, depending on thickness and whether you’re using direct or two-zone heat. Pull it at 140F to 145F internal and let carryover heat finish the job during a 3-minute rest.
| Tenderloin Size (weight / thickness) | Direct Heat (400F-450F, turned often) | Two-Zone (sear then indirect) | Pull Temp Target | Rest Time |
|---|---|---|---|---|
| Small: 0.75-1 lb, about 1.5 in thick | 12-16 minutes total | Sear 2-3 min/side, then 6-9 min indirect | 140-145F | 3 minutes |
| Medium: 1-1.25 lb, about 2 in thick | 16-20 minutes total | Sear 2-3 min/side, then 9-13 min indirect | 140-145F | 3 minutes |
| Large: 1.25-1.5 lb, about 2.5 in thick | 20-25 minutes total (watch for exterior char) | Sear 3-4 min/side, then 12-16 min indirect | 140-145F | 3-5 minutes |
| Two tenderloins, side by side (packaged pair) | Add 2-4 minutes over single-loin times | Add 2-4 minutes over single-loin times | 140-145F | 3-5 minutes |
These are starting windows, not guarantees. Grill grates run hotter or cooler than the lid thermometer suggests, tenderloins vary in shape even at the same listed weight, and the only number that actually tells you the loin is done is the one on a thermometer.
How Long to Cook Pork Tenderloin on the Grill: Direct vs Two-Zone
Direct heat
Direct heat puts the tenderloin right over the flame or coals the whole time, which cooks fast but risks a scorched exterior before the center catches up, especially on the thicker end of a tenderloin where one tip is often noticeably narrower than the other. Turn it every 3 to 4 minutes on all sides so no single spot chars while the rest lags behind.
Two-zone heat
A two-zone setup, one side hot for searing and one side cooler for finishing, gives you a browned crust in a few minutes per side, then lets the interior come up to temperature more evenly over indirect heat with the lid closed. This is the more forgiving method for a cut this size, because it separates the crust-building step from the doneness step instead of asking one heat level to do both.
Pull Temperature and Carryover by Doneness Level
The USDA Food Safety and Inspection Service lists the safe minimum internal temperature for whole cuts of pork, including tenderloin, as 145F, measured with a food thermometer, followed by a 3-minute rest before carving. That rest matters: it is not optional resting for texture, it is part of how the temperature is verified safe.
Carryover cooking on a tenderloin this thin is smaller than on a thick roast, typically 3F to 8F depending on grill heat and how long it sat over direct flame, but it is still enough to overshoot your target if you pull right at 145F. Most people pull a few degrees early and let the rest finish the climb.
| Doneness Preference | Pull Temp Off Grill | Expected Rise After Rest | Final Result |
|---|---|---|---|
| Minimum safe, slight blush center | 140-142F | +3 to 5F | Reaches 145F+ during rest, pale pink center |
| Standard, firm with faint pink | 142-145F | +3 to 6F | 145-150F, mostly opaque with a thin pink line |
| Well done, no pink | 148-150F | +3 to 8F | 153-158F, fully opaque, firmer texture |
Whichever band you’re aiming for, confirm with a thermometer inserted into the thickest part of the loin rather than trusting the clock or the color. An instant-read meat thermometer is the fastest way to check without cutting the loin open and losing juice.
What Changes the Number
Thickness, not just weight
Two tenderloins can weigh the same and cook at different rates if one is short and thick and the other is long and thin. The tapered tip of a tenderloin will finish well before the thick center, which is why turning and checking the center specifically matters more than watching the whole piece.
Starting temperature
A tenderloin straight from the refrigerator takes longer to reach pull temperature than one that sat out for 20 to 30 minutes first. If you’re working from frozen, plan for a noticeably longer cook and check earlier than the table suggests rather than assuming the extra time is baked in.
Grill model and fuel type
Gas grills, charcoal, and pellet grills all hold and cycle heat differently, and even two gas grills of similar size can run hot or cool depending on burner condition and lid seal. Treat the lid thermometer as a rough guide and use grate-level readings or a grill light within a similar range if your model runs unevenly.
Trimming and silverskin
A tenderloin with the silverskin left on cooks slightly less evenly, since that membrane doesn’t render and can cause the loin to bow on the grate. Trimming it beforehand isn’t a time factor so much as a shape factor, but a bowed loin cooks unevenly enough to throw off a straight read from the table.
Common Mistakes
- Judging doneness by cut color alone. Pork can look pink at a safe temperature and look done before it actually is. A thermometer reading is the only reliable check.
- Cooking straight through on direct heat without turning often enough. The exterior chars well before the center reaches target, especially on thicker loins.
- Skipping the rest. The 3-minute rest is part of the USDA’s stated safety guidance, not just a texture tip, and skipping it means the temperature you measured off the grill is the only one that counts.
- Not accounting for the tapered end. Checking only the fattest part of the loin can mean the thin end is already well past your target when the center hits 145F.
For a similar thickness-driven approach on a different cut, see How Long to Bake a Steak in the Oven, by Thickness. And if you’re weighing safety minimums against tenderness targets on a larger cut, Internal Temp of Brisket: 145F Safety vs 203F Tenderness walks through that same pull-temp logic on a bigger scale.
FAQ
How long does pork tenderloin take on a gas grill?
Plan for roughly 15 to 25 minutes on a gas grill set to 400F to 450F, depending on the loin’s thickness and whether you’re using direct heat the whole time or searing first and finishing over the cooler side. Confirm doneness with a thermometer rather than the clock, since gas grills vary in how evenly they hold temperature.
What temperature should pork tenderloin be pulled off the grill?
Most people pull a whole tenderloin between 140F and 145F internal, then rest it for 3 minutes so it reaches the USDA’s stated safe minimum of 145F. Pulling a few degrees below your final target accounts for the modest carryover rise that happens during the rest.
Do you grill pork tenderloin with the lid open or closed?
Closing the lid during the indirect or finishing phase helps the grill hold a steadier ambient temperature around the loin, which speeds even cooking. During the direct sear on either side, the lid is usually open briefly for turning, then closed again to trap heat.
Why is my grilled pork tenderloin dry?
Overshooting the pull temperature is the most common cause, since a lean cut like tenderloin has very little fat to buffer against overcooking. Pulling at 140F to 145F and resting rather than cooking straight through to a higher number, and using a probe like a leave-in grill thermometer to catch the target without opening the lid repeatedly, are the two most reliable fixes.
Practical Recommendation
Start with a two-zone setup if your grill allows it: sear both sides over direct heat for color, then move the loin to indirect heat and close the lid until it reads 140F to 145F. Pull, tent loosely, rest for 3 to 5 minutes, and check the center one more time before slicing. The table above gets you close, but the thermometer is what actually confirms it’s done.