How to Grill Tri-Tip

Tri-tip sits in an odd and very useful place. It is a roast — a two to three pound triangular cut off the bottom sirloin — but it cooks in about forty minutes and eats like steak. That combination is why it feeds a table for a fraction of what the same number of ribeyes would cost, and why it is worth knowing how to cook even if you have never seen one at your butcher.

The method is a sear followed by indirect heat, which is the opposite order to a reverse sear and works here because the cut is relatively thin for a roast. Weber’s recipe for a 2 to 2½ pound tri-tip is specific enough to follow exactly.

The numbers

Thirty to forty minutes of grill time total, then the rest. A bigger roast takes longer, which is exactly why the thermometer rather than the clock decides when it comes off.

Doneness, and the safety number

Weber pulls this roast at 125°F for medium rare, which is a doneness preference. The USDA’s safe minimum internal temperature for whole cuts of beef is 145°F followed by a three-minute rest, and cooking below that is a choice the cook makes. The USDA is also explicit that color is not a reliable test of doneness, so this is a cook you measure rather than eyeball — particularly on a wedge-shaped cut that is much thicker at one end than the other.

That taper is worth planning for. A tri-tip has a thick end and a thin end, so it will produce a range of doneness from one slice to the next on purpose. If somebody at the table wants it more done, serve them from the thin end rather than cooking the whole roast further.

Why the slicing rule decides the texture

Weber’s instruction is to slice the meat across the grain, and on tri-tip this does more work than it does on almost anything else. Cut with the grain and you get long muscle fibers in every slice, which chew like rope no matter how well you cooked it. Cut across them and the same roast is tender.

Look at the surface of the meat before you start and find the direction the fibers run. Then cut perpendicular to them. If the roast is large enough that the grain direction clearly changes across it, cut the roast into sections first and slice each section across its own grain rather than carving the whole thing in one direction.

Charcoal, gas or pellet

All three work, because all three can be arranged with a hot side and a cooler side. On charcoal, bank the coals; on gas, light some burners and leave others off; on a pellet grill, use the whole grate at 350–400°F and sear in cast iron if the grill cannot get hot enough on its own. Our direct vs indirect heat guide covers the arrangement, and best grills for searing steak deals with grills that struggle at the top end.

What to look for in the gear

Two tools matter here, and they are the same two that matter for every large cut of beef.

An instant-read thermometer is the one that is not optional. Weber’s method ends at a number, not a time, and on a tapered roast you will want to check more than one spot. Look for a read in a few seconds and a thin tip.

A long knife is the other. Slicing a tri-tip across the grain in clean, even pieces needs a blade that crosses the roast in one pull; a short chef’s knife turns into a saw and tears the fibers you were careful to cut across. A granton or hollow edge helps the slices release instead of sticking to the blade. A board with a channel catches what a rested roast gives up, and cast iron is the fix if the grill cannot sear properly by itself.

How to grill tri-tip, step by step

1. Season and set up two zones. Weber uses direct and indirect medium heat, 350 to 400°F.
2. Sear it. 10 minutes over the direct side with the lid closed, turning once.
3. Move it over to finish. 20 to 30 minutes over indirect heat.
4. Pull at 125°F for medium rare. Check the thick end, and remember the thin end will be further along.
5. Rest 10 to 15 minutes. Indoors, at room temperature.
6. Slice across the grain. Find the fiber direction first; section the roast if the direction changes across it.

Common mistakes

Treating it like a steak and leaving it over direct heat. A two-inch-thick roast over a hot fire burns outside and stays raw in the middle. The sear is ten minutes, not the whole cook.

Cooking to time. Tri-tips vary by a pound or more. The 20 to 30 minute window is Weber’s figure for a 2 to 2½ lb roast; measure rather than assume.

Carving it the easy way. The direction you cut matters more than anything you did to it before. See the knives built for exactly this.