How Long to Cook Brisket — Times by Weight and Oven Temperature
Brisket is a tough, heavily worked cut full of connective tissue, which is exactly why it needs low, slow heat over many hours rather than a quick roast. Rushing it at a higher temperature doesn't save time — it just produces a brisket that's both dry on the outside and tough in the middle.
Brisket Cook Time by Weight and Oven Temperature
| Weight | 250°F (120°C) | 275°F (135°C) | 300°F (150°C) |
|---|---|---|---|
| 3-4 lb | 4½-6 hrs | 3-4 hrs | 2½-3½ hrs |
| 5-6 lb | 7½-9 hrs | 5-6 hrs | 4-5 hrs |
| 7-8 lb | 10½-12 hrs | 7-8 hrs | 5½-7 hrs |
| 10-12 lb | 15-18 hrs | 10-12 hrs | 8-10 hrs |
These ranges assume roughly 1 to 1¼ hours per pound at 275°F, or about 1½ hours per pound at the slower 250°F. A large brisket (10 lb+) is easier to manage cut into two smaller pieces and cooked as if each were its own roast — it's genuinely hard to cook a whole one evenly. Keep the oven no higher than about 325°F; going hotter to save time risks burning the exterior before the interior's connective tissue has broken down.
Why Brisket Needs a Much Higher Internal Temperature
Most beef roasts are done well before 200°F — a medium-rare roast is pulled around 130-135°F. Brisket is different because it's loaded with collagen, a tough connective protein that doesn't break down until it spends significant time above roughly 195°F. Below that point, brisket is technically safe to eat (the USDA minimum for whole-muscle beef is 145°F) but will be noticeably chewy, since the collagen is still intact. The extended time at high internal temperature is what converts that collagen into gelatin, which is what makes finished brisket tender and moist instead of tough.
| Internal Temp | What's Happening |
|---|---|
| 145°F (63°C) | USDA safe minimum — but still tough, connective tissue intact |
| 160-170°F (71-77°C) | "The stall" — evaporative cooling can pause the temperature rise for 1-2+ hours |
| 195-205°F (91-96°C) | Target range — collagen has broken down, brisket is fork-tender |
The "stall" deserves its own mention: somewhere in the 160-170°F range, brisket's internal temperature often plateaus for an hour or more as moisture evaporating from the surface cools the meat, counteracting the oven's heat. This is normal, not a sign anything went wrong — resist the urge to raise the oven temperature to push through it, since patience (or wrapping the brisket in foil to trap steam and push past the stall faster) is the standard fix.
Fat Side Up or Down?
For oven cooking, fat side up is the more common recommendation — as the fat renders, it bastes the meat from above, helping keep it moist through the long cook. Either orientation works with attentive basting; what matters more is not skipping the fat cap entirely, since it's protecting the meat underneath from drying out.
Resting Before Slicing
Rest brisket for at least 15-30 minutes, tented loosely with foil, before slicing — cutting into it immediately lets the juices run out onto the cutting board instead of staying in the meat. Slice against the grain; brisket has two different grain directions across the flat and the point, so check which way the fibers run before cutting each section.
Grilling or Smoking Instead of the Oven
Brisket is also a classic low-and-slow smoker project, cooked indirect at a similar 225-275°F range for the same reasons an oven needs low heat — see Direct vs Indirect Heat for setting up an indirect zone on a charcoal or gas grill, and the Grill Temperature & Time Calculator for the hand-test method to check your zone temperature without a thermometer.
Frequently Asked Questions
How long does it take to cook a brisket per pound?
About 1 to 1¼ hours per pound at 275°F (135°C), or roughly 1½ hours per pound at 250°F (120°C). A typical 5-8 lb brisket takes 5-10 hours depending on the oven temperature. Time by weight is only a starting estimate — always finish by internal temperature, not the clock.
What internal temperature should brisket be cooked to?
195-205°F (91-96°C) for sliceable, fork-tender brisket — well above the 145°F USDA minimum for whole-muscle beef. Brisket is safe to eat at 145°F, but at that temperature the connective tissue hasn't broken down, so it will be tough. The higher target is about texture, not food safety.
Why is my brisket tough even though I cooked it long enough?
Almost always an internal temperature issue, not a time issue — brisket needs to reach 195-205°F for the connective tissue (collagen) to break down into gelatin. If it was pulled at 180°F or lower, even after several hours, it will be chewy. Trust a thermometer over the clock; cook time varies with oven accuracy, brisket thickness, and whether it was wrapped.