Sous Vide Pork Tenderloin: Temperature, Time, and a Fast Sear

Pork tenderloin cooks sous vide in a precisely temperature-controlled water bath, usually at 140 to 145°F (60 to 63°C) for about 2 to 3 hours, which brings the whole length of this lean, narrow cut to the same rosy, juicy doneness before a very short, very hot sear. Tenderloin was the cut I gave up on before I owned a circulator. It is cheap for how tender it is, it cooks in no time, and I still managed to serve it chalky at the thin end and underdone at the thick end almost every time. In the bath it became the weeknight cut I reach for most, and the one that converted my sister, who had spent her life politely sawing at dry pork.

Why tenderloin suits a water bath

Pork tenderloin suits sous vide because it is very lean and tapers from thick to thin, and a bath brings every part of it to exactly the same temperature. In an oven, the thin tail end races past done while the thick end catches up, and a lean cut has no fat to hide the damage. In water held at one temperature, nothing can get hotter than the bath, the ceiling that Douglas Baldwin’s guide builds all of its tables around¹. So the tail and the thick end finish at the same doneness, just at slightly different times, and the tail waits patiently for the rest.

Tenderloin also has almost no collagen to break down. Like a steak or a chicken breast, it is a pure temperature cook: you only need to bring it up to heat and hold it there long enough to be safe. That is a different job from a shoulder or a belly, which need many hours to soften, as covered in sous vide pork belly.

Temperatures by texture

For tenderloin, 140°F (60°C) gives rosy, very juicy meat and 145°F (63°C) gives paler, firmer meat that still stays moist. These sit inside the 140 to 145°F (60 to 63°C) range the site uses for pork chops and loin in the master times and temperatures chart, and the gap between them is noticeable on the plate:

140°F (60°C): pink through the centre, glossy, soft enough to cut with the side of a fork. This is where I cook it for us.

145°F (63°C): blush rather than pink, a little firmer, and the setting I use when I cook for people who are wary of pink pork. Still far juicier than any oven tenderloin I ever made.

150°F (66°C) and above: fully white and noticeably drier, edging back toward the result the bath is supposed to rescue you from.

The USDA’s recommended safe minimum for whole cuts of pork is 145°F (63°C) followed by a three minute rest². The lower setting is explained in the safety section below.

How long to cook it

A tenderloin of about 1.5 to 2 inches (4 to 5 cm) across usually needs 2 to 3 hours at 140°F (60°C), and in my kitchen the texture starts to slip after about 4 hours. Time depends on thickness rather than weight, and a tenderloin is closer to a cylinder than a slab, so heat reaches its centre faster than it would through a flat cut of the same thickness¹. Baldwin’s pasteurisation table for meat at 140°F (60°C) gives about 2 hours for 40 mm and about 2.5 hours for 50 mm, counted from the fridge¹, which is why I treat 2 hours as my working minimum at 140°F (60°C) and go to 2.5 hours for a thick one.

Those times start when the bag goes into water that is already at temperature. Two tenderloins in separate flat bags take no longer than one, but two folded into the same bag behave like one thick piece. There is slack once the meat is heated through, so an extra half hour while the potatoes catch up costs nothing. Much past 4 hours, though, a lean muscle with no collagen to reward the wait starts to go soft and slightly woolly, the same effect described in can you overcook sous vide.

Trimming, seasoning, and bagging

Trim the silverskin, season simply, and seal the tenderloin flat and straight. The silverskin is the thin, pearly sheet of connective tissue along one side. It does not soften at these temperatures, and in the bath it tightens and bows the meat into a banana. Slide a thin knife under one end and run it along the length with the blade tilted up toward the sheet, and the rest comes away cleanly.

Salt and pepper do most of the work. I salt a few hours ahead when I remember and just before sealing when I do not, and add a strip of lemon zest or a sprig of thyme rather than anything heavy. Raw garlic is better added in the pan than in the bag, and a long brine is unnecessary on a cut the bath already keeps juicy. The thin tail can be tucked under and tied so the tenderloin is a more even thickness, which makes the sear easier too. The wider rules on what goes in the bag are in seasoning and aromatics in sous vide.

The sear: hot and short

Pat the tenderloin very dry and sear it in a smoking hot pan for about 45 to 60 seconds a side, turning it to brown all four faces. A tenderloin is narrow, so a long sear drives heat a long way into a small piece of meat and brings back the grey band you spent two hours avoiding. I dry it on a rack for ten minutes while the pan heats, sear it in a little high smoke point oil, and add a knob of butter only for the last few seconds, when it can brown without burning. A torch works too, with a pan underneath doing the bottom. Unlike an oven roast, a tenderloin straight from the bath needs only a minute or two to settle before slicing. The full sequence, and the reasons behind each step, are in how to sear after sous vide.

Food safety and the 140°F setting

Holding tenderloin at 140°F (60°C) for long enough is a pasteurising cook, not a shortcut, and anyone in a higher risk group should be served pork at 145°F (63°C) or above. Pasteurisation is a pairing of time and temperature: lower temperatures need longer holds to reach the same reduction in bacteria, and Baldwin’s tables are written by thickness for exactly that reason¹. That is why a thick tenderloin pulled at 1 hour is a different thing from the same tenderloin held for 2.

The bath sits right at the top edge of the danger zone of 40 to 140°F (4 to 60°C)³, so treat 140°F (60°C) as the floor for this cut rather than a setting to shave. If you cook ahead, chill the bag in iced water until it is cold through and get it into the fridge well within 2 hours, which is the USDA’s limit for cooked food at room temperature⁴. Pork cooked to 145°F (63°C) meets the standard USDA guidance⁵, which is the setting to use for anyone who is pregnant, very young, elderly or immunocompromised. The reasoning behind all of this is set out in the food safety guide.

This guide is general information and one cook’s experience, reviewed by a professional chef. Always follow current food-safety guidance for your situation.