Meat Thermometer for Salmon and Fish: Target Temps by Doneness and Species

Salmon and Fish Temperature Chart

Salmon by doneness first, since that is what most people are cooking, then the other common fish.

Cooking salmon or tuna below 145°F is a doneness preference and an informed-risk choice on whole fillets, not a food-safety violation the way undercooked chicken or ground meat is. Bacteria on whole fish live on the surface, which the heat sears. Use fresh, well-chilled fish, and buy sushi-grade if you plan to serve it rare. One more thing: farmed salmon has more fat and stays moist a few degrees higher than lean wild salmon, so wild king or sockeye is best pulled at the low end of each range.

Where to Insert the Probe in a Fish Fillet

A fillet is often under an inch thick and it tapers, which makes placement its own problem.

Go In From the Side

Insert the probe from the side, horizontally into the thickest part of the fillet, angled toward the center. Pushing straight down through a half-inch fillet hits the pan or the sheet tray and reads far too hot. Use the pull-back method: push the tip past center, then draw it back slowly and take the lowest reading.

Check the Thick Shoulder, Not the Tail

The thick shoulder end of a salmon fillet finishes 10 to 15 degrees behind the thin tail end. Check the thick part, because if that is done the thin end is well past it. For a whole fish, insert behind the head into the thickest part along the backbone, avoiding the spine.

Check Once

Fish flesh is delicate. Every probe hole is visible on the plate and lets moisture out, so check once, right at the end of the cook. The flake test, where the flesh separates along its lines when you nudge it with a fork, roughly corresponds to 130 to 135°F. It works, but it is a “past medium” signal: by the time salmon flakes easily it is firmer than most people want, which is why a reading beats it.

Which Thermometer Type to Use for Fish

An instant-read is the right tool for fish. Fillets cook in 6 to 12 minutes, the window is tiny, and a leave-in probe clipped into a delicate fillet tears it and often slips out or hits the pan.

Response speed matters more here than for almost any other cut. A thermocouple instant-read that reads in two or three seconds lets you check and pull before carryover takes the fillet past your target; a slow six-second read can cost you the fillet. A thin probe tip helps too, since it leaves a barely visible hole and reaches the center of a thin cut without over-inserting.

The one exception is a large whole fish or a side of salmon roasted low and slow. That is thick enough to hold a leave-in probe and the cook is long enough to justify one. Our full roundup covers tested fast instant-reads, and the steak guide covers the same thin-cut, fast-carryover situation in more depth.

Carryover and Resting for Fish

A fillet is thin, but carryover still matters because the target window is so narrow. Expect 3 to 5°F of rise on a fillet, more on a thick center-cut salmon steak or a whole side.

Pull salmon about 5°F below your target doneness and let it rest 3 to 5 minutes. A fillet pulled at 120°F will settle around 123 to 125°F, right in the silky range. Do not tent fish tightly in foil, which keeps it cooking and steams it. Rest it loosely on a warm plate.