You’ll usually cook corned beef in a crock pot for 8–10 hours on LOW or 4–5 hours on HIGH , but the exact time depends on the size of the brisket and how tender you want it.

Quick Scoop

  • For most 2–4 lb corned beef briskets:
    • LOW: about 8–10 hours until fork‑tender.
* HIGH: about 4–5 hours.
  • Larger 4–6 lb briskets often need closer to 10–12 hours on LOW or 6–8 hours on HIGH.
  • Aim for very tender meat at around 195°F internal temperature; it should pierce easily with a fork.
  • Let it rest 10–15 minutes, then slice across the grain so it stays tender.

Simple timing guide (crock pot)

  • 2–3 lb brisket: 8–9 hours on LOW, or 4–5 hours on HIGH.
  • 3–4 lb brisket: 9–10 hours on LOW, or 5–6 hours on HIGH.
  • 4–5 lb brisket: 10–12 hours on LOW, or 6–7 hours on HIGH.
  • 5–6 lb brisket: 12–14 hours on LOW, or 7–8 hours on HIGH.

Easy step‑by‑step

  1. Place corned beef (fat side up) in the crock pot and sprinkle on the spice packet.
  1. Add enough water (or broth/beer mix) to come about 1/2 inch up the side of the meat.
  1. Cook on LOW for 8–10 hours (or HIGH for 4–5), checking tenderness near the end of the range.
  1. Add potatoes and carrots for the last 3–4 hours, and cabbage for the last 1–2 hours so they don’t overcook.
  1. Rest, slice against the grain, and serve.

Think of it this way: if you want that classic, fall‑apart St. Patrick’s Day-style corned beef, give it the full low‑and‑slow day in the crock pot and don’t rush the last hour.

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Wondering how long should corned beef cook in a crock pot? Get an exact hour‑by‑hour guide for different brisket sizes, plus low vs. high settings and veggie timing, in this quick rundown.

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