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10 lb Brisket at 275°F

Wrapped in butcher paper, a 10 lb whole packer at 275°F runs about 8 h 20 m of cook time — plan 10 h 20 m door to table with a 2-hour rest. For dinner at 5 PM, put it on at 6:30 AM. Adjust anything below and the plan recalculates.

Brisket Cook Time Calculator

Put it on at

6:30 AM

Total time
10 h 20 m (8 h 20 m cook + 2 h rest)
Realistic range
9 h 20 m – 11 h 20 m
Pit temperature
Wrap
Cut
Rest / hold (hours)

Your timeline

  1. 6:30 AMBrisket on the smoker
  2. 10:16 AMStall begins (~150–170°F internal)
  3. 11:06 AMWrap it
  4. 2:02 PMStart probing for tenderness
  5. 2:52 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 10 lb brisket at 275°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 lunch1:30 AM
3:00 PM4:30 AM
5:00 PM6:30 AM
7:00 PM8:30 AM

Wrapped or naked at 275°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~8 h 20 m~10 h 20 m
Foil (Texas crutch)~7 h 40 m~9 h 40 m
No wrap~9 h~11 h

Cooking a flat instead of a whole packer? A trimmed flat is thinner and finishes faster — figure about 7 h 30 m at 275°F in paper.

275°F: hot and fast

275°F is the hot-and-fast school — the temperature many Texas joints quietly run because time is money. At 0.9 hours per pound, a 10 lb packer finishes in about 8 h 20 m wrapped in paper. That turns brisket from an overnight commitment into a same-day cook — for a 5 PM dinner you light the smoker at 6:30 AM.

The trade is attention. Everything moves faster at 275°F, including the window between perfect and overdone, so probe earlier than you think you need to and trust feel over the clock. Wrapping is close to mandatory here — the bark sets fast, and paper keeps the flat from drying while the point finishes.

At 10 lb you are at the small end of whole packers — some of what you see at this weight is actually a large flat with the point removed. A true small packer cooks a touch faster than the rate tables suggest because it is thinner; start probing early.

How many people does a 10 lb brisket feed?

Trimming and a long cook take roughly half the raw weight, so a 10 lb packer yields about 5 lbs of sliced brisket. Plated at half a pound per adult, that is 10 people; chopped into sandwiches at a third of a pound, closer to 15 servings. Feeding a crowd near 10? The brisket for 10 people page does the shopping math, and the portion calculator handles kids, sides, and leftovers.

Quick answers

How long does a 10 lb brisket take at 275°F?

About 8 h 20 m wrapped in butcher paper, or 9 h unwrapped — plan 10 h 20 m total with a 2-hour rest. The honest range is 9 h 20 m to 11 h 20 m, because thickness matters more than weight and no two briskets cook alike.

When should I start a 10 lb brisket at 275°F for dinner at 5 PM?

Put it on at 6:30 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 10 lb brisket feed?

A 10 lb raw packer yields roughly 5 lbs of sliced brisket after trimming and cooking — about 10 adults as a plated main at half a pound each, or around 15 sandwiches at a third of a pound each.

Other briskets at 275°F