How Long to Smoke a Flank Steak: Half These Recipes Are Timing the Sear Too
Google's AI Overview puts a flank steak at 45 to 90 minutes. Jerkyholic gets there in 20. Traeger's own recipe runs a full 3 hours. All three can be right, because a fast reverse sear and a full smoke-through aren't the same cook, and only one of these sources says which one it timed.
Google’s AI Overview puts a flank steak at 225°F for 45 to 90 minutes. Jerkyholic gets the same cut off the smoker in 20 to 30 minutes, then finishes it in a 425°F pan. Traeger’s own recipe, at a similar chamber temperature, keeps it on for a full 3 hours. A Reddit thread lands at about an hour to an hour and fifteen minutes. A cook in a Facebook smoking group ran 275-300°F for two hours and reported the steak came out dry. The fastest number here is nine times smaller than the slowest, on a cut that barely varies in thickness from one grocery store to the next.
This site found weight explained most of the spread on prime rib and shape explained the rest of it on beef tenderloin. Flank steak breaks that pattern. It is a long, flat, roughly half-inch-thick muscle sold in a narrow weight band, usually one and a half to two and a half pounds, with almost none of the taper that made tenderloin hard to time. A cut this uniform should not produce a nine-fold gap in cook time. What it can produce is a nine-fold gap in what “done” means to whoever wrote the recipe.
What the AI Overview already spelled out
Buried in that AI Overview is a detail none of the individual recipes bother to spell out on their own: pull at 115°F to 120°F if reverse-searing, or all the way to 125°F to 130°F if smoking straight through with no sear at all. That is two different cooks wearing one instruction. A steak pulled at 118°F and dropped into a screaming-hot pan for two minutes a side is not attempting the same result as one left in the smoker until the thermometer reads 128°F on its own. Read every source above with that split in mind and most of the gap closes. Jerkyholic’s 20 to 30 minutes and a similar recipe from Smoked Meat Sunday, at 30 minutes, are both smoke-then-sear numbers, timing only the low-temperature half of the job. The Reddit thread and a smoke-through recipe from BBQing with the Nolands, at roughly one to two hours with no separate sear mentioned, are timing the whole thing.
Why a cut this thin skips the low-and-slow window
A half-inch-thick flank steak has far more surface exposed to heat relative to its total mass than a tenderloin or a chuck roast will ever have. Heat only has to travel a quarter-inch or so to reach the center from either face, instead of the two or three inches it crosses on a roast. Left at 225°F long enough to build real bark, a piece this thin often blows past medium before the surface has done much visible work at all. That is the practical reason so many of the sources above pull it early and hand the crust off to a hot pan or a hot grate instead of asking the smoker to do both jobs at once: browning at 225°F takes far longer than the meat underneath can afford to wait.
That same logic explains the two long outliers instead of just leaving them unexplained. Traeger’s own 3-hour recipe and the Facebook cook’s 275-300°F, two-hour, dry result both treat a thin, lean cut the way this site’s chuck roast piece treats a thick, fatty one. A half-inch muscle with almost no intramuscular fat to render does not have two or three hours of margin to spend. Most of its cooking window is already closed by the time a roast that size would still be climbing through the stall.
Pull temperatures by method
| Method | Chamber temp | Pull temp | Approx. total time |
|---|---|---|---|
| Reverse sear | 225°F | 115-120°F, then seared | 30-45 min smoke, plus a 2-4 min sear |
| Smoke straight through | 225-250°F | 120-130°F | 60-90 min |
Whole-muscle beef is safe at 145°F, the same floor this site’s tenderloin and brisket pieces already cite, but almost nobody pulls a flank steak that far. It has a pronounced, visible grain and very little fat between the fibers, so pushing past medium does not just dry it out, it makes the grain itself harder to chew through. Every source in this search, without exception, repeats the same instruction for after the cook: slice thin, against the grain. On most cuts that is a nice-to-have. On flank steak, cut the wrong direction and an otherwise correctly cooked steak can still eat tough.
Where flank steak sits next to this site’s other reverse-sear cuts
The tri tip piece on this site already covers the same smoke-then-sear split, on a thicker cut that still finishes in under two hours. The tenderloin piece found that a taper complicates probe placement enough to shift the reading by itself. Flank steak sits at the fast, flat end of that same spectrum: no taper to fight, thin enough that the reverse sear window opens within half an hour, and the same two-lane choice between searing and not that decides the clock on both of those other cuts.
What this means for the timeline
Decide which cook this is before lighting the smoker, because that choice sets the clock more than the scale does. Reverse-searing a typical one-and-a-half to two-pound flank steak at 225°F, start checking around the 20-minute mark and expect to pull somewhere between 115°F and 120°F before it hits the pan. Smoking it straight through with no separate sear, expect closer to an hour to ninety minutes and a pull in the 120°F to 130°F range. Either way, the margin between rare and overdone on a muscle this thin closes fast. A probe left in the thickest part of the steak catches that faster than checking the clock every twenty minutes.
What I haven’t measured
This site has not run a flank steak through its own smoker yet, so the temperatures above come from cross-checking the sources here against how thin, lean cuts have behaved on other pieces measured for this site, not from a chamber logged for this one. Two questions stayed open. Whether a cast-iron sear at 400°F gets close enough to the crust a 450°F-plus grate produces to matter is one; none of the sources here tested cast iron directly against a grate. Whether Traeger’s 3-hour number reflects a genuinely thicker steak, a cooler chamber than stated, or just a more conservative recipe card is the other, and nothing in the recipe itself answers it. See how this site tests and labels its content for what “measured” versus researched means here.
A similar sear-versus-no-sear split shows up on London broil, a thicker but comparably lean cut where chamber temperature ends up mattering more than the sear choice itself.
