How Long Does It Take to Cook a Brisket in the Oven?

Quick Answer

A brisket in the oven takes 4–6 hours at 275°F (135°C) for a typical 4–5 pound flat. The general rule is 1–1.25 hours per pound at this temperature. Larger cuts and lower temperatures extend cooking time significantly. The brisket is done when it reaches an internal temperature of 195–205°F and a probe slides in with no resistance.

Cooking Time by Weight and Temperature

Brisket Weight	At 225°F	At 250°F	At 275°F	At 300°F
3 lbs	4.5–5 hrs	3.5–4.5 hrs	3–3.5 hrs	2.5–3 hrs
4 lbs	6–7 hrs	5–6 hrs	4–5 hrs	3.5–4 hrs
5 lbs	7.5–8 hrs	6–7 hrs	5–6 hrs	4–5 hrs
6 lbs	9–10 hrs	7–8.5 hrs	6–7 hrs	5–6 hrs
8 lbs	12–13 hrs	10–11 hrs	8–9 hrs	6.5–7.5 hrs
10 lbs	15–16 hrs	12.5–14 hrs	10–11 hrs	8–9 hrs
12–15 lbs (full packer)	18–20 hrs	15–17 hrs	12–15 hrs	10–12 hrs

Step-by-Step Timeline

Step	Time	Details
Season/rub the brisket	Night before or 1+ hour ahead	Salt, pepper, garlic; let sit uncovered in fridge
Bring to room temperature	30–60 min	Remove from fridge before cooking
Preheat oven	15–20 min	Set to 275°F
Initial cook (covered in foil or Dutch oven)	3–4 hours	Fat side up; add 1 cup beef broth
Check internal temp	1 min	Looking for 165–170°F (the stall)
Continue cooking (wrapped)	1–2 hours	Push through to 195–205°F
Rest (critical step)	30–60 min	Tent with foil; juices redistribute
Slice and serve	10 min	Slice against the grain, 1/4-inch thick
Total	5–7 hours	For a 4–5 lb flat

Temperature Comparison

Oven Temp	Cook Time per lb	Best For	Texture
225°F	1.5–1.75 hrs/lb	Low-and-slow enthusiasts	Most tender; closest to smoked
250°F	1.25–1.5 hrs/lb	Weekend cooks	Excellent tenderness
275°F (recommended)	1–1.25 hrs/lb	Best balance of time and quality	Very tender; great bark
300°F	45–60 min/lb	Shorter time budget	Good; slightly less tender
325°F	35–45 min/lb	Weeknight cooking	Acceptable; less forgiving

The Stall

Around 150–170°F internal temperature, the brisket's temperature may plateau for 1–2 hours. This is called "the stall" — moisture evaporating from the surface cools the meat at the same rate the oven heats it. Wrapping the brisket tightly in foil or butcher paper (the "Texas crutch") pushes through the stall faster and keeps the meat moist.

Keys to a Great Oven Brisket

• Don't skip the rest: Resting for at least 30 minutes (up to 2 hours wrapped in a towel in a cooler) allows juices to redistribute throughout the meat
• Use a meat thermometer: Temperature is more reliable than time; aim for 195–205°F
• Fat side up: The fat cap bastes the meat as it renders
• Wrap at the stall: Foil wrapping at 165°F speeds cooking and retains moisture
• Slice against the grain: The brisket flat and point have different grain directions; identify and cut perpendicular to the fibers

Flat vs Full Packer

Most grocery store briskets are flats (3–6 lbs), which cook in 4–6 hours at 275°F. A full packer brisket (10–15 lbs) includes both the flat and the point and requires 12–18 hours at the same temperature. For a first attempt, a flat is more manageable and forgiving.