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12 lb Brisket at 250°F

Wrapped in butcher paper, a 12 lb whole packer at 250°F runs about 12 h 50 m of cook time — plan 14 h 50 m door to table with a 2-hour rest. For dinner at 5 PM, put it on at 2:00 AM. Adjust anything below and the plan recalculates.

Brisket Cook Time Calculator

Put it on at

2:00 AM

Total time
14 h 50 m (12 h 50 m cook + 2 h rest)
Realistic range
13 h 20 m – 16 h 20 m
Pit temperature
Wrap
Cut
Rest / hold (hours)

Your timeline

  1. 2:00 AMBrisket on the smoker
  2. 7:47 AMStall begins (~150–170°F internal)
  3. 9:04 AMWrap it
  4. 1:33 PMStart probing for tenderness
  5. 2:50 PMPull it (~203°F, probe-tender)
  6. 5:00 PMSlice and serve

Planning estimates at ±12% — thickness matters more than weight, and no two briskets cook alike. The clock never decides when it's done: brisket is done when a probe slides into the thickest part of the flat like warm butter, around 203°F internal. Cook to feel, serve on time by resting longer — a wrapped brisket holds beautifully for hours.

When to start a 12 lb brisket at 250°F

Butcher paper wrap, whole packer, 2-hour rest. Start times round down to the quarter hour — early is free, late is dinner at nine.

Serving atPut it on at
12:00 PM lunch9:00 PM · the day before
3:00 PM12:00 AM
5:00 PM2:00 AM
7:00 PM4:00 AM

Wrapped or naked at 250°F?

Wrapping shortens the stall. Foil is fastest but softens bark; butcher paper is the standard compromise; no wrap costs time and buys crust.

WrapCook timeWith 2 h rest
Butcher paper~12 h 50 m~14 h 50 m
Foil (Texas crutch)~11 h 45 m~13 h 45 m
No wrap~13 h 50 m~15 h 50 m

Cooking a flat instead of a whole packer? A trimmed flat is thinner and finishes faster — figure about 11 h 35 m at 250°F in paper.

250°F: the workhorse

250°F is what most working pitmasters actually run, and the math shows why: at 1.15 hours per pound, a 12 lb packer takes about 12 h 50 m in butcher paper — hours faster than the same brisket at 225°F, with no real trade in tenderness. The fire is hot enough to power through the stall's worst stretch but not so hot that the flat dries out while the point catches up.

For a 12 lb brisket this is the flexible middle: start it before sunrise and you are resting comfortably before a 5 PM dinner, with the hold absorbing any surprise.

12 lb is the sweet spot — the most common size in the cryovac pile and the size most rate tables are built around. These numbers should track closely.

How many people does a 12 lb brisket feed?

Trimming and a long cook take roughly half the raw weight, so a 12 lb packer yields about 6 lbs of sliced brisket. Plated at half a pound per adult, that is 12 people; chopped into sandwiches at a third of a pound, closer to 18 servings. Feeding a crowd near 12? The brisket for 12 people page does the shopping math, and the portion calculator handles kids, sides, and leftovers.

Quick answers

How long does a 12 lb brisket take at 250°F?

About 12 h 50 m wrapped in butcher paper, or 13 h 50 m unwrapped — plan 14 h 50 m total with a 2-hour rest. The honest range is 13 h 20 m to 16 h 20 m, because thickness matters more than weight and no two briskets cook alike.

When should I start a 12 lb brisket at 250°F for dinner at 5 PM?

Put it on at 2:00 AM. That includes the cook plus a 2-hour rest, and the start time is rounded down to the quarter hour — starting early is free, because a wrapped brisket holds for hours.

How many people will a 12 lb brisket feed?

A 12 lb raw packer yields roughly 6 lbs of sliced brisket after trimming and cooking — about 12 adults as a plated main at half a pound each, or around 18 sandwiches at a third of a pound each.

Other briskets at 250°F