How long does a brisket take on an offset smoker?

5.5 kg packer brisket, offset smoker, smoking, United States

Answered, thinly

There is an answer, but it rests on thinner evidence than it should — read the reasons before you trust the window.

The question, as BBQHQ read it

Food: Brisket
Cooker: Offset smoker
Heat: smoking
Where: US
Weight: 5.5 kg
Starting state: fridge cold
On the table: 18:30

The cooking window

Estimated cooking window

9h 15m–17h 20m

Low confidence

Why this is a range, not a number

Weight varies within the range this covers
Cookers hold temperature imperfectly
Individual animals and pieces differ
Thickness varies between pieces
Outside temperature and wind
How often the lid comes off

Cook to the endpoint, not to the clock. The window tells you when to start checking.

Why this is not stronger

Only one source applies to these conditions.
The window is BBQHQ's arithmetic on a source's per-unit rate, not a window the source published.
The endpoint is well established; the timing behind it is not. Cook to the endpoint.
No source states the weight of the food.
At least one source does not state the cooker temperature.
No source states the thickness, which governs cooking time more than weight.
No source states whether the food went on fridge-cold or rested.

How the window was built

Base, from matched guidance: 8h 50m–15h 30m
Straight from the fridge: +27 min–112 min
Food going on cold has further to travel. The effect scales with the length of the cook rather than being a fixed number of minutes.
Final window: 9h 15m–17h 20m

What this could not settle

Thickness was not supplied. It governs cooking time more directly than weight does, so the window is wider than it needs to be.
One independent publisher stands behind this window. A second would not necessarily widen it, but it would be the first real check on it.
Other publishers appear on this page — AmazingRibs.com, United States Department of Agriculture, Food Safety and Inspection Service — and they supply endpoints or doneness rather than timings. They are not a second opinion about the clock.

This window is BBQHQ’s arithmetic, not a published figure

No source published this window. BBQHQ calculated it by applying a source's stated rate to a weight, and the working is shown below. Treat it as arithmetic on a rule of thumb, not as a figure anybody has measured.

The rate, in the source’s words: “one hour of cooking per pound of raw cut”
Applied to: 4.0–7.0 kg
The calculation: 4–7 kg is 8.82–15.43 lb. At 60 minutes per pound that is 529–926 minutes, rounded outwards to the nearest ten to 530–930 minutes (8h50 to 15h30). Rounded outwards rather than to nearest, because narrowing a window that is already arithmetic on a rule of thumb would add precision that nothing supports.

The source hedged this rate. Texas A&M reports this as what 'many guidelines' use rather than asserting it as a finding of its own.

What the calculation assumes

That the rate applies to the whole 4–7 kg band, which the source does not say — it names no weight range at all.
That raw weight is the right multiplier, which the source does state: 'per pound of raw cut'.
That the pit sits in the 200–250 °F range the same publisher gives elsewhere, since the rate is quoted without a cooker temperature.
That the stall, which Greg Blonder's experiments put at around six hours for a large cut, is already absorbed somewhere inside a rule of thumb that never mentions it. This is the weakest assumption in the list and it is the reason the window is nine hours wide.

When is it done? Separate questions, separate answers

“Done” means several things and they do not coincide. The safety endpoint is set by the jurisdiction you are cooking in and is not a matter of taste. Culinary doneness is what you want. The texture endpoint is how you actually tell.

Food-safety endpoint

USDA Food Safety and Inspection Service
In the United States, whole cuts of beef, pork, lamb and veal — steaks, chops and roasts — should reach 145 °F (63 °C), followed by a rest of at least three minutes before carving or eating.
- 63 °C (145 °F) — measured at the centre of the thickest part, away from bone and fat.
The rule and its source
In the United States, whole cuts of beef, pork, lamb and veal have a safe minimum internal temperature of 145 °F (63 °C), followed by a rest of at least three minutes.
Well established
- United States Department of Agriculture, Food Safety and Inspection Service — States this directly
  “Cook raw beef, pork, lamb and veal steaks, chops, and roasts to a minimum internal temperature of 145 °F ... allow meat to rest for at least three minutes”
  Form:
  Whole cuts only. Ground meats are covered by a separate, higher figure.
  The three-minute rest is part of the safety requirement, not only a quality step.
  How it was measured:
  As measured with a food thermometer before removing from the heat source.
  About this source · Original · retrieved 2026-08-13

Texture endpoint — how you actually know

Probe tender — like pushing into softened butter

A probe slides into the thickest part of the flat with no resistance at all, and the point wobbles when the whole piece is lifted. Two briskets of identical weight can reach this two hours apart, which is why every experienced account describes the feel rather than a number — and why the temperature below is a guide to when to start checking rather than a target to cook to.

Indicative only: 85–91 °C (185–196 °F). This is not a target to cook to — the feel decides.

Where this comes from

Brisket becomes tender when its collagen converts to gelatin, which Texas A&M Meat Science gives as requiring an internal temperature of 185 to 195 °F (roughly 85–91 °C) — far above the safety endpoint for the same meat, and a texture endpoint rather than a doneness preference.

Well supported

Texas A&M University, Department of Animal Science (Meat Science) — States this directly
“it requires a higher internal temperature (ranges from 185 to 195°F) to achieve this conversion”
A texture endpoint — where connective tissue becomes soluble. Not a doneness preference and emphatically not a safety figure.
What it covers:
Stated for collagen generally, in the context of high-connective-tissue barbecue cuts such as brisket and pulled pork.
Roughly 25 °C above the USDA whole-cut safety endpoint for the same meat. Both are correct; they answer different questions.
About this source · Original · retrieved 2026-08-13
Texas A&M University, Department of Animal Science (Meat Science) — States this directly
“tend to have high levels of connective tissue, which require longer cooking times at low temperatures”
Point and flat are the two muscles of a packer brisket, and they differ materially in fat.
A flat and a whole packer are not the same cook, which is why they are held as separate applicability cases rather than one.
About this source · Original · retrieved 2026-08-13

When to start

Start somewhere between

19:18(the day before) and 06:03

A window, not a time. Every step below is worked backwards from the slow end of the cooking range, because food ready early can wait and food ready late cannot.

Backwards plan from a serving time of 18:30
Stage	Clock window
Off the heat	14:15–16:15
Rest before carving	60 min–2h
Ready to carve	15:15–18:15
On the table	18:30

Rest before carving

Time off the heat before carving, for the sake of the meat rather than for safety. Skipping it costs juice and makes carving harder; it does not make the food unsafe.

60 min–2h before slicing

BBQHQ's own reasoning about a cut this size, not a figure any source published.

Holding it hot

A separate question from resting, and a temperature one rather than a clock one.

Can be held under these evidenced conditions: above 60 °C for up to 4h.

Instrument: Clemson HGIC, Safe Handling of Beef

The instrument states no maximum holding time and nothing about what to do if the temperature falls. BBQHQ will not invent either.

Holding is a temperature question rather than a clock question. Wrapped and kept above the holding floor for your territory a brisket will sit for hours and is usually better for it; between fridge temperature and that floor is where food safety fails. The floor itself comes from your own jurisdiction's instrument and is stated in the plan — it is not the same number everywhere. The METHOD is now sourced where the floor is not: AmazingRibs documents preheating an insulated cooler with hot water, dumping it, and packing the foil-wrapped meat between towels in a disposable pan, and reports measuring meats still well above 150 °F after three hours. That is a documented practice and a measured duration from one publisher, not a safety instrument, and BBQHQ keeps the two apart.

Why the plan looks like this

This cook has a wide window (9h 15m–17h 20m), so the plan aims to finish early and hold rather than to land on a minute.
Holding for up to 2h absorbs the difference between a fast cook and a slow one. Food ready early can wait; food ready late cannot.
Every step is worked backwards from the slow end of the range, so the plan still holds on a cold, windy day.
The rest time is BBQHQ's own reasoning about a cut this size, not a figure any source published. It is labelled here rather than presented as evidence.
The hold must stay above 60 °C, from Clemson HGIC, Safe Handling of Beef.

Hold above 63 °C, or chill it properly — food sitting between fridge and serving temperature is where food safety fails. Check the safety guidance for your territory.
This plan starts the day before. Check the serving time, and consider whether an overnight cook is really what you want.

Hazards, by kind

These are not about when the food is done. They are about whether the activity is safe where you are doing it, and each kind sits under its own heading because they are answered in different ways.

Equipment safety

Failure, stability, assembly and maintenance of the cooker itself.

Weber charcoal barbecues: outdoor use only Critical
Weber instructs that its charcoal barbecues must not be used indoors, in a garage, building or breezeway, or any other enclosed area, and not under any overhead combustible construction. Coals and ashes must be fully extinguished before the barbecue is stored.
Ninja Woodfire: outdoor household use only, three feet of clearance Critical
SharkNinja instructs that the Ninja Woodfire Pro XL is for outdoor household use only, with a minimum of 3 feet from its rear, sides and top to walls, rails or other combustible construction, and at least 1 foot from the pellet box while smoking. Only food-grade wood pellets may go in the smoke box — never charcoal, hardwood or liquid fuel.
Wire brush bristles can end up in food Significant
A bristle shed by a wire grill-cleaning brush can be left on the bars, picked up by the next thing cooked on them and swallowed. Documented cases have required surgery to remove it.
Electric does not mean indoor-safe Significant
An electrically powered outdoor cooker is not automatically safe to use indoors. Producing no carbon monoxide removes one hazard; it does not remove fire risk, smoke, or the manufacturer's own restriction on where the appliance may be used.
Electric smokers: earthed supply, RCD protection, outdoor-rated cord Significant
Masterbuilt instructs that its electric smoker runs only from a properly earthed outlet, is supplied through a residual current device rated at no more than 30 mA, and uses only a grounding-type three-wire outdoor extension cord kept dry and off the ground. The supply cord is to be examined regularly and the appliance not used if it is damaged.

Carbon monoxide

Carbon monoxide from burning fuel. Invisible, odourless, and the reason no combustion cooker belongs in an enclosed space.

Never take a barbecue into an enclosed space Critical
Never take a barbecue into a tent, awning, caravan, motorhome, garage, shed or any other enclosed space — including to keep warm, and including when it is no longer flaming.
A cooling barbecue is still producing carbon monoxide Critical
A barbecue continues to give off carbon monoxide as it cools. Never bring one inside to finish cooling, and never store one indoors until it is completely cold.
Electric smokers still produce carbon monoxide — from the wood, not the element Critical
An electric smoker's heat comes from a mains element that burns nothing, and the appliance still emits carbon monoxide, because the wood chips it makes smoke with are burning inside the cabinet. Masterbuilt warns that burning wood chips gives off carbon monoxide, which has no odour and can cause death, and that chips must never be burned inside homes, vehicles, tents, garages or any enclosed area.
Offset smokers: never under an overhead structure of any kind Critical
Oklahoma Joe's instructs that its smoker be used only in a well-ventilated space and never in an enclosed one — naming a carport, garage, porch, covered patio or any overhead structure — and warns that burning charcoal indoors can kill because it gives off odourless carbon monoxide.

Fuel handling

Lighting, handling and disposing of charcoal, wood and firelighters.

Spent coals can reignite for up to 24 hours Significant
After a charcoal fire appears extinguished, unconsumed embers can retain heat for up to 24 hours and can burst into flame unexpectedly when fresh air reaches them. Embers outside the firebox can ignite combustible surfaces such as a wooden deck.

The working

How the sources were combined

1.Reconciling 1 observation(s) that bear on the duration. 4 further observation(s) — endpoints, doneness ladders, pull temperatures — are evidence about this cook and are NOT counted as opinions about its length.
2.All observations describe compatible conditions; they form one group.
3.6 temperature pair(s) held apart rather than combined, because they answer different questions.
4.Unstated by at least one source: cooker temperature, weight, thickness, starting temperature. Treated as uncomparable, not as agreement.
5.Confidence: moderate — 1 independent publisher(s), with 4 condition(s) unstated.
6.Evidence about this cook that is not evidence about its length: AmazingRibs.com, United States Department of Agriculture, Food Safety and Inspection Service. Retained as provenance, excluded from corroboration.

Held apart on purpose

Figures that look like they should be compared and must not be. Different question, different jurisdiction, or different doneness — not a dispute.

At least one source reports no internal temperature.
Different outcomes: texture endpoint against mid-cook stage milestone. These answer different questions and are not combined.
Different outcomes: texture endpoint against food-safety endpoint. These answer different questions and are not combined.
Different outcomes: mid-cook stage milestone against food-safety endpoint. These answer different questions and are not combined.

How this answer was classified

1.57 published profile(s) considered; 1 cover this question.
2.Answered, but thinly: confidence low, 1 publisher(s) corroborating the cooking time.

Brisket, low and slow

Four new duration publishers were found and none of them publishes a brisket time. A university meat science department publishes the PHYSICS instead, which turns out to be more useful. Texas A&M gives the pit range as 200–250 °F by indirect cookery, and collagen conversion — what 'tender' actually means for this cut — as 185–195 °F. Those are a COOKER temperature and a TEXTURE endpoint, and neither competes with the USDA's 63 °C whole-cut SAFETY figure, which this brisket passes in the first few hours and which tells a cook nothing about when it is ready. Three outcome concepts, three correct numbers, held apart. On duration the source gives a rate — one hour per pound — and explicitly frames it as a general rule rather than a finding. The window below is BBQHQ multiplying that rate across this profile's 4–7 kg band; it is arithmetic on somebody else's rule of thumb, it is labelled as such in the confidence reasons, and it is not a figure Texas A&M published.

The safety rules behind this profile

In the United States, whole cuts of beef, pork, lamb and veal have a safe minimum internal temperature of 145 °F (63 °C), followed by a rest of at least three minutes.

Well established

United States Department of Agriculture, Food Safety and Inspection Service — States this directly
“Cook raw beef, pork, lamb and veal steaks, chops, and roasts to a minimum internal temperature of 145 °F ... allow meat to rest for at least three minutes”
Form:
Whole cuts only. Ground meats are covered by a separate, higher figure.
The three-minute rest is part of the safety requirement, not only a quality step.
How it was measured:
As measured with a food thermometer before removing from the heat source.
About this source · Original · retrieved 2026-08-13

What is still missing

Brisket is the most-searched cook in American barbecue and the one where a wrong answer costs a whole day. BBQHQ obtained the physics — a sourced pit range and a sourced collagen conversion endpoint — and the only duration any retrieved source offers is 'one hour per pound', which Texas A&M itself attributes to 'many guidelines' rather than asserting. The missing middle was then obtained: the stall is sourced, at 150–170 °F and about six hours at a 230 °F pit, with a controlled experiment behind the mechanism. That accounts for most of the width of the published window and is the strongest support the refusal has. It still is not a duration. BBQHQ's published window remains arithmetic on a rule of thumb across a weight band, now labelled as derived from a rate rather than said only in prose.
Does any authoritative technical source publish a brisket cooking DURATION under stated conditions, rather than a per-pound rule of thumb?
This is the narrowed successor to the brisket duration gap and it is the more tractable half. BBQHQ cannot establish how long a brisket takes and does not need to in order to plan one usefully: a cook that can be finished early and held to a known temperature floor is plannable even when its duration is a nine-hour window, which is the whole argument for the finish-early strategy. What is missing is the REST. The 60–120 minute figure the profile publishes is BBQHQ's reasoning, and the published joint-rest guidance now in the catalogue — MLA at 10–20 minutes, AHDB at 20 or more — is about a domestic roast and is not transferable to a 4–7 kg piece cooked for twelve hours.
Does any authoritative source state a resting or holding time for a whole barbecued brisket?