How Long to Cook Brisket in the Oven at 300°F
Brisket in the oven at 300°F takes 300–420 minutes. Pull at 145°F internal. Full chart and calculator below.
Brisket in the Oven at 300°F149°C. Pull at 145°F63°C internal. Rest 30 min.
How long to cook brisket in the oven at 300°F
- Food
- Pot Roast
- Cut
- Brisket
- Appliance
- Oven
- Temperature
- 300°F149°C
- Cook time
- 300–420 minutes
- Internal temp
- 145°F (63°C)63°C (145°F)
- Rest time
- 30 minutes
- Source
- USDA FSIS
Answer: Brisket in the oven at 300°F149°C takes 300–420 minutes. Pull at 145°F63°C internal and rest 30 minutes before serving.
Evidence: USDA safe minimum for whole beef cuts is 145°F, but pot roast is cooked well past that to ~195–205°F where collagen fully breaks down and the meat shreds. The safety temp is not the doneness temp here — time and tenderness are.
Brisket Oven Calculator
Estimates only. Brisket cook time varies with appliance, starting temperature, and shape. Always verify with an instant-read thermometer.
Safe Internal Temperature
145°F (63°C)63°C (145°F) measured at the thickest part with an instant-read thermometer.
USDA safe minimum for whole beef cuts is 145°F, but pot roast is cooked well past that to ~195–205°F where collagen fully breaks down and the meat shreds. The safety temp is not the doneness temp here — time and tenderness are.
Source: USDA FSIS
Brisket Oven Cook Time Chart
| Temp | State | Time |
|---|---|---|
| 300°F149°C | refrigerated | 300–420 min |
How to Cook Brisket in the Oven
- 1Preheat your oven to 300°F149°C.
- 2Cook for 300–420 minutes.
- 3Verify the thickest part reaches 145°F63°C on an instant-read thermometer.
- 4Rest for 30 minutes before slicing.
Frequently Asked Questions
How long does pot roast take in a slow cooker?
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A 3–4 lb chuck roast takes 8–10 hours on LOW or 4–6 hours on HIGH. Low-and-slow gives the most tender, fall-apart texture — it's worth the extra time.
How long does pot roast take in the oven?
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A chuck roast in a covered Dutch oven at 325°F takes about 1 hour per pound. A 4 lb roast takes 3–4 hours. Sear the meat first, then braise in beef broth with aromatics, lid on.
Can I cook pot roast from frozen?
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The Instant Pot handles frozen pot roast best — add 30 minutes to your standard pressure-cooking time. Slow cooker is not recommended from frozen because the meat stays in the bacterial danger zone too long.
What internal temperature should pot roast reach?
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195–205°F internal. Pot roast is done when a fork slides in with no resistance — the meat should shred, not slice. This is well past USDA safe (145°F); the extra cooking is what develops the tender texture.