Frozen meatballs in a slow cooker generally need about 2–4 hours on HIGH or 4–8 hours on LOW , depending on size, sauce, and whether they are fully cooked; always heat them to at least 160–165°F internally for safety.

Basic cook times

  • For most fully cooked frozen meatballs (standard 1–1.5 inch size):
    • HIGH: 2–4 hours until heated through.
* **LOW:** 4–6 hours, and they can usually sit up to about 8 hours on LOW or WARM without drying if there’s plenty of sauce.
  • Many family-style recipes suggest 4–6 hours on LOW as a sweet spot for tender meatballs in sauce.

Food safety and doneness

  • Most bagged frozen meatballs are already cooked; the slow cooker’s job is to bring them up to a safe serving temperature, not to cook raw meat from scratch.
  • Aim for an internal temperature of 160–165°F in the center of the meatball; use an instant-read thermometer to be sure.
  • Give them a stir once or twice during cooking so they heat evenly and don’t burn where they touch the sides.

Sauce, size, and setting tips

  • Make sure the meatballs are mostly covered in sauce (often at least 3 cups for a standard bag) so they don’t dry out or scorch.
  • Larger or denser meatballs may need the upper end of the time ranges; smaller appetizer-style meatballs often heat closer to 2 hours on HIGH or 4 hours on LOW.
  • If you need to hold them for a party, cook on HIGH or LOW as above, then switch to WARM once they’re hot, stirring occasionally to keep the sauce from catching.

Quick reference table

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Meatball type Slow cooker setting Typical time Notes
Fully cooked, frozen, standard size HIGH 2–4 hours Check at 2 hours; serve when 160–165°F inside.
Fully cooked, frozen, standard size LOW 4–6 hours (up to 8) Good for all-day cooking; keep saucy to avoid drying.
Small appetizer meatballs HIGH ~2–3 hours Popular for jelly/BBQ party meatballs.
Small appetizer meatballs LOW 3–4 hours Then switch to WARM for serving.
**TL;DR:** For “set it and forget it,” put frozen, fully cooked meatballs in plenty of sauce and cook **4–6 hours on LOW** (or **2–4 hours on HIGH**), then confirm they hit 160–165°F before serving.

Information gathered from public forums or data available on the internet and portrayed here.