Should I insert the thermometer from the top or the side of a thick steak?

From the side. Insert the probe horizontally into the thickest part of the steak, about halfway up its height, so the tip reaches the geometric center. Top-down insertion is harder to control and often ends up too shallow.

How far in should the probe go for a thick steak?

The sensing tip needs to reach the center of the thickest muscle. For a 2-inch steak, that means inserting the probe about 1 inch from the side. The probe should be parallel to the cutting board and not poke through the opposite side.

Why does my thermometer reading change when I leave the probe in?

The reading changes as the meat cooks, but sudden jumps or drops usually mean the probe has moved. It may have slipped closer to the surface, touched a bone, or shifted during flipping. Reposition it and take a fresh reading.

Do I need a leave-in thermometer for a thick steak, or is an instant-read enough?

Both work. An instant-read requires you to open the grill and insert the probe each time you check, which loses heat. A leave-in probe lets you monitor continuously without opening the lid, which is helpful for thick steaks that take longer to cook.

Where to Put the Probe in a Thick Steak: A Practical Guide

Why placement matters more with a thick steak

A thick steak—anything over 1.5 inches—cooks unevenly. The outer layers heat faster than the center, so the temperature you measure depends entirely on where the probe sits. Insert the probe too close to the surface and you will pull the steak early; too deep and it will be overcooked by the time the center catches up.

The goal is to measure the coldest part of the meat, which is the geometric center of the thickest muscle. That is the last area to rise in temperature, and it determines the final doneness. With a thin steak, the margin for error is small; with a thick one, the distance between the surface and the center is large enough that probe position becomes the difference between a medium-rare center and a well-done one.

In practice, this means you are not just looking for any spot to stab the thermometer. You are locating the thickest part of the steak, aiming for its center, and keeping the probe parallel to the cooking surface so it does not poke through the top or bottom.

A digital meat thermometer probe inserted into the side of a thick raw steak on a cutting board

The side-entry method: the standard for thick cuts

For a thick steak, insert the probe horizontally through the side, not from the top. The side entry lets you run the probe along the longest dimension of the steak, so the sensing tip ends up in the center. From the top, the probe travels a short vertical distance and is much harder to stop at exactly the middle.

Hold the steak steady with tongs. Find the thickest section—usually the center of the cut, away from the tapered ends. Insert the probe at the side, about halfway up the height of the steak, and push it in until the tip reaches the middle. The probe should be parallel to the cutting board and level with the steak's equator.

If the steak has a bone, keep the probe at least one inch away from it. Bone conducts heat differently than muscle, so a reading taken near the bone will not reflect the temperature of the meat you are about to eat.

Insert at the side, not the top, for thick cuts.
Aim for the thickest part of the steak.
Keep the probe parallel to the cooking surface.
Stay at least one inch from any bone.
The sensing tip must reach the geometric center.

What the reading actually tells you

When the probe is correctly placed, the reading is the temperature of the coldest point. That is the number you compare against your target doneness. If you pull the steak when the center hits 130°F for medium-rare, the outer layers will be more done, which is exactly what you want in a thick steak.

The reading will climb slowly at first, then speed up as the center warms. Do not pull the steak the moment the number hits your target. Residual heat—carryover cooking—will push the center up another 5 to 10°F after you remove it from the heat. For a thick steak, pull it about 5°F below your target and let it rest.

If the reading jumps suddenly or drops between checks, the probe has likely slipped out of the center or moved closer to the surface. Reposition it and take a fresh reading before deciding the steak is done.

A cooked thick steak resting on a wooden board with a thermometer probe still inserted in its side

Common placement mistakes and how to spot them

The most frequent error is inserting the probe from the top and stopping too shallow. The tip ends up in the outer ring of the steak, which is already well past the target temperature while the center is still raw. The result is a steak that reads medium-rare but is actually rare in the middle.

Another mistake is angling the probe downward so it exits the bottom of the steak. The tip then reads the temperature of the pan or grill grates, not the meat. You will see an artificially high reading. If the probe feels like it hit resistance and then gave way, it may have pierced the bottom surface.

A third issue is placing the probe in a thin tail or a narrow end of the steak. These areas cook faster and give a higher reading, leading you to pull the steak early. Always return to the thickest muscle, even if it means repositioning the steak on the grill.

Mistake	What the reading shows	Result
Top-down insertion, too shallow	Higher than true center temp	Steak pulled early, raw center
Probe angled through the bottom	Spikes near pan/grill heat	Steak pulled early, undercooked
Probe in a thin tail section	Higher than true center temp	Steak pulled early, uneven doneness
Probe touching bone	Erratic, higher readings	Unreliable doneness check

Leave-in probes for thick steaks on the grill

For a thick steak, a leave-in probe is often the better tool. You insert it once, close the grill lid, and monitor the temperature without opening the grill and losing heat. The placement rules are the same as for an instant-read: side entry, thickest part, center of the muscle.

The difference is that the probe stays in place for the whole cook. That means the wire needs to route out of the grill without pinching under the lid. Most grill probes have a cable rated for high heat, but the clip or grommet that holds the wire should sit outside the cooking chamber.

A leave-in probe lets you watch the temperature climb in real time. For a thick steak, that is useful because the center temperature rises slowly and then accelerates. You can pull the steak at the right moment without hovering over the grill with an instant-read thermometer.

How to check your placement before you cook

Before the steak hits the heat, do a dry run. Insert the probe as described, then gently wiggle it. The tip should be surrounded by meat on all sides, not poking through the surface. If you see the tip or feel it against the cutting board, pull it out and reinsert at a slightly different angle.

For a very thick steak, over 2 inches, you can measure the thickness with your fingers. The center is roughly halfway between the top and bottom surfaces. If the steak has a uniform thickness, that midpoint is easy to find. If it tapers, aim for the thickest section and accept that the thinner parts will be more done.

Once you have placed the probe, you can also test it against a known reference. Touch the tip to your palm and see if the reading jumps to body temperature, around 98°F. That confirms the thermometer is working and the tip is exposed to the meat, not insulated by a pocket of air.