How the planner works
Every pitmaster has a rule of thumb, and they agree more than they admit. We use the middle of the range and then work backwards from your dinner time.
A 12-pound packer at 250°F is around 15 hours unwrapped and 12 wrapped in paper. Add an hour of rest and an hour of buffer and the meat goes on about 14 hours before you plan to eat. For a 6 p.m. dinner that is 4 a.m., which is why so many brisket cooks start the night before and hold the finished brisket in a cooler.
Brisket cook time by weight and temperature
Unwrapped, whole packer, hours to probe-tender. Wrapped cooks run about 20% shorter.
| Trimmed weight | 225°F | 250°F | 275°F | 300°F |
|---|---|---|---|---|
| 6 lb flat | 9 h | 7.5 h | 6 h | 5 h |
| 10 lb packer | 15 h | 12.5 h | 10 h | 8 h |
| 12 lb packer | 18 h | 15 h | 12 h | 9.5 h |
| 14 lb packer | 21 h | 17.5 h | 14 h | 11 h |
| 16 lb packer | 24 h | 20 h | 16 h | 13 h |
The stall, and why we add a buffer
Somewhere around 150 to 165°F internal, the brisket stops climbing for two to four hours. Moisture evaporating off the surface cools it as fast as the pit heats it. It is normal, and it is the reason no calculator can promise a finish time to the minute. Wrapping in butcher paper or foil traps that moisture and pushes through the stall faster, at the cost of some bark. The buffer in the planner exists so that a long stall ruins nobody's dinner; a brisket that finishes early just rests longer, and a longer rest is better anyway.
Temperature is a guide; feel is the answer
Start checking at 195°F. A brisket is done when a probe slides into the flat like it is going into warm butter, usually between 200 and 205°F. The point is always done before the flat. If the flat is tender at 198°F, pull it; if it is still tight at 205°F, give it more time.
Resting and holding
Rest at least an hour, wrapped, so the juices settle back into the meat. A faux Cambro, which is a dry cooler with towels, holds a brisket safely above 140°F for four to six hours. If you have the time, a long rest at 150°F in a warming oven is what the famous Texas joints do, and it is the single biggest upgrade most backyard cooks can make.
Frequently asked
How long does it take to smoke a brisket at 225?
About 1.5 hours per pound unwrapped, so a 12-pound packer takes around 18 hours. Wrapping at the stall cuts that to roughly 14 to 15 hours.
How long to smoke a 10 lb brisket at 250?
Plan on 12 to 13 hours unwrapped or about 10 hours wrapped, plus at least an hour of rest. Put it on about 13 hours before you want to eat.
When should I wrap my brisket?
When the bark is set and the internal temperature stalls, usually 150 to 165°F and about 5 to 6 hours into a 250°F cook. Paper keeps more bark; foil finishes faster.
What time should I start a brisket for dinner?
For a 6 p.m. dinner with a 12-pound packer at 250°F wrapped, light the smoker around 3 a.m. and put the meat on at about 4 a.m. If that sounds miserable, cook it the day before and hold it, or run 275°F and start at 7 a.m.
Can a brisket rest too long?
Not really, as long as it stays above 140°F. Four hours in a cooler is common; competition cooks hold even longer. Under an hour is where most dry brisket comes from.