Meat Thermometers: Why Temperature Beats Time

By Bill Bulloch, the Sausage Sommelier — backyard griller, Roswell, Georgia

Every grilling failure I remember had the same cause: I cooked by the clock instead of by temperature. A recipe says twelve minutes, but the steak is thicker than the recipe's steak, the grill is hotter, and the meat came out of a colder refrigerator. Time is a guess. Temperature is a measurement. A thermometer is the single purchase that improves every cook you will ever do.

Why time fails

Cooking time depends on at least five variables: meat thickness, starting temperature, grill temperature, wind, and how often you open the lid. Change any one and the time changes. Temperature cuts through all of it: when the center of the meat reaches the temperature you want, it is done, regardless of how long it took. This is also a food-safety matter. Chicken and pork have safe internal temperatures, and the only way to know you reached them is to measure. Color is unreliable — chicken can look done and still be undercooked inside. The thermometer is the only honest witness at the grill.

Instant-read vs. leave-in: different jobs

An instant-read thermometer is a probe you insert for a few seconds to get a fast reading, then remove. It is the decision tool: use it near the end of a cook, in several spots, to find the coolest part. A good one reads in a few seconds with a thin probe that does not leave a leaking hole. If you buy one thermometer, buy this kind.

A leave-in probe thermometer stays in the meat for the whole cook, with a wire or wireless connection to a display outside the grill. Many models add a second probe that clips to the grate and tracks grill temperature. Set a target and an alarm, and it tells you when the meat gets there — which means you stop opening the lid to check. Leave-in probes are most valuable on long cooks: roasts, whole chickens, pork shoulders, anything low and slow. Use both together: the leave-in probe watches the trend, and the instant-read confirms the final reading before the meat comes off.

Where to probe

Probe the thickest part of the meat, with the tip at the center. On a steak, insert from the side, horizontally, so the tip sits in the middle of the thickest section. On a whole chicken, probe the thickest part of the thigh without touching bone. Bone conducts heat differently and reads hotter than the meat around it, and fat pockets read differently too — avoid both, because a reading taken against bone will tell you the meat is done before it is. Take more than one reading on thick or uneven cuts: the coolest reading is the true reading.

Carryover cooking: pull early

Meat keeps cooking after it leaves the grill. Heat from the hotter outer layers moves toward the cooler center, and the internal temperature rises several degrees before it falls. That is why experienced grillers pull meat a few degrees below the target and let the rest finish the job — a steak pulled at the target temperature overshoots it on the board. Pull early, rest, and probe again before slicing. During the rest, juices redistribute instead of running out onto the board. Tent loosely with foil if you like, but do not wrap tightly — trapped steam softens the crust you worked to build.

Keeping a thermometer honest

A thermometer that reads wrong is worse than no thermometer, because it gives false confidence. Test yours in a glass of ice water: crushed ice, a little water, stirred well, should read at the freezing point. If it reads more than a couple of degrees off, recalibrate it following the maker's instructions, or replace it. Test a few times a season and after any drop. Keep probes clean and dry, store them where the probe will not bend, and never leave an instant-read thermometer sitting in a hot grill — leave-in probes are built for the grill; instant-reads are built for the check.

Frequently asked questions