Smoked Brisket
at 275°F
The answer
9 hr – 12 hrat 275°F
Plan on 45 to 60 minutes per pound in a 275°F smoker. A 12 lb smoked brisket lands around 9 hr – 12 hr. Done is 145°F on a food thermometer, plus a 60-minute rest — never the clock alone.
SOURCE·USDA FSIS safe minimum internal temperatures·275°F planning range derived·REVIEWED JUL 2026
USDA safe zone — 145°F and above
Done is a temperature, not a time. Every figure on this page is a planning range; the green band is the only part that decides. For a whole packer brisket it opens at 145°F and a 60-minute rest.
Source—USDA Food Safety & Inspection Service safe minimum internal temperatures—retrieved 2026-07
How this is worked out
- Anchor. Start from what USDA FSIS publishes for a whole packer brisket — its safe minimum internal temperature of 145°F, and the FSIS roasting timetable where one exists for this cut.
- Rate. Convert the anchor into a planning rate at 275°F: 45–60 min/lb, cross-checked against at least three independently published sources.
- Scale. Multiply that rate by your weight. A 12 lb piece lands at 9 hr – 12 hr; the range is widened to cover source disagreement rather than averaged into false precision.
- First check. The first thermometer reading is set at 85% of the low end of the range — early enough that an under-reading costs nothing and a late one cannot cost the meal.
- Gate. The time is only a plan. It is not done until a food thermometer reads 145°F in the thickest part, then rests about 60 minutes. Time never overrides temperature on this site.
- Round. Every printed figure is rounded to the nearest 5 minutes; precision beyond that would be invented.
plan_low = weight_lb × 45 min/lb
plan_high = weight_lb × 60 min/lb
first_check = plan_low × 0.85
DONE ⟺ internal_temp ≥ 145°F AND rest ≥ 60 min
(USDA FSIS — the gate, not the clock)
SOURCE·USDA FSIS safe minimum internal temperatures·safe minimum for this cut·REVIEWED JUL 2026
Time by weight at 275°F
Planning ranges for a fully thawed, fridge-temperature smoked brisket. The right-hand column is when to take the first thermometer reading.
| Weight | Estimated time at 275°F | Check thermometer from |
|---|---|---|
| 8 lb | 6 hr – 8 hr | 5 hr 5 min in |
| 9 lb | 6 hr 45 min – 9 hr | 5 hr 45 min in |
| 10 lb | 7 hr 30 min – 10 hr | 6 hr 25 min in |
| 11 lb | 8 hr 15 min – 11 hr | 7 hr in |
| 12 lb | 9 hr – 12 hr | 7 hr 40 min in |
| 13 lb | 9 hr 45 min – 13 hr | 8 hr 15 min in |
| 14 lb | 10 hr 30 min – 14 hr | 8 hr 55 min in |
| 15 lb | 11 hr 15 min – 15 hr | 9 hr 35 min in |
| 16 lb | 12 hr – 16 hr | 10 hr 10 min in |
Start checking the internal temperature well before the low end of the range — an early check costs nothing; a late one costs the meal. Done means 145°F on a food thermometer (see the pull-temperature note below).
SOURCE·USDA safe-temperature guidance·timing ranges derived, see method·REVIEWED JUL 2026
275°F vs the other temperatures
Same cut, every temperature this site publishes for it.
| Oven temp | Time for a 12 lb smoked brisket | Per pound |
|---|---|---|
| 225°F | 15 hr – 18 hr | 75–90 min/lb |
| 250°F | 12 hr – 15 hr | 60–75 min/lb |
| 275°F (this page) | 9 hr – 12 hr | 45–60 min/lb |
SOURCE·USDA safe-temperature guidance·timing ranges derived, see method·REVIEWED JUL 2026
When it is actually done
145°F internal
The USDA FSIS safe minimum internal temperature for this cut is 145°F, followed by a rest of about 60 minutes. The clock estimates; the thermometer decides. Every time on this page is a planning range, not a doneness test.
Pull temperature vs safe temperature: Brisket is safe at 145°F and inedible at 145°F. It is pulled at 195–203°F — most pitmasters probe for 'butter-soft' around 203°F in the flat — because only there has the collagen fully rendered.
SOURCE·USDA FSIS safe minimum internal temperatures·smoked brisket row of the FSIS chart·REVIEWED JUL 2026
The clock tells you when to start looking. The thermometer tells you when to stop.
What the ledger does not tell you
- Plan for the long end of the range plus an hour of buffer. A brisket that finishes early holds happily for hours wrapped in a cooler; a late one ruins dinner.
- The stall (150–170°F, sometimes 2–4 hours of no progress) is evaporative cooling. Wrapping in butcher paper or foil pushes through it faster at some cost to bark.
- Thickness beats weight: a thick 10-pounder can outlast a thin 14-pounder. That is why every serious time estimate is a range.
- Rest a minimum of one hour, wrapped. Many BBQ joints hold brisket 4+ hours — the rest is part of the cook, not an afterthought.
Answers people ask
How long does a whole packer brisket take at 275°F?
Plan on 45 to 60 minutes per pound at 275°F. A 12 lb example takes about 9 hr – 12 hr. It is done when the internal temperature reaches 145°F on a food thermometer, not when the clock runs out.
What internal temperature is a whole packer brisket done at?
145°F, measured with a food thermometer in the thickest part, then rested about 60 minutes. That is the USDA FSIS safe minimum. Brisket is safe at 145°F and inedible at 145°F. It is pulled at 195–203°F — most pitmasters probe for 'butter-soft' around 203°F in the flat — because only there has the collagen fully rendered.
Is 275°F a good temperature for a whole packer brisket?
It is one of 3 temperatures this site publishes for this cut (225°F, 250°F, 275°F). Lower runs longer and more forgiving; higher runs faster with more browning. 250°F is the most common choice.
SOURCE·USDA FSIS safe minimum internal temperatures·doneness figures quoted in these answers·REVIEWED JUL 2026
Where these numbers come from
Ranges are anchored to USDA FSIS published timetables where they exist, and derived from that anchor plus cross-checked published sources where they do not — widened to cover the disagreement between sources rather than split down the middle. The full reasoning is on the method page. If a figure here looks wrong, say so — corrections are prioritised.
SOURCE·USDA safe-temperature guidance·timing ranges derived, see method·REVIEWED JUL 2026
