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Smoke baby back ribs for about 5 hours at 225°F, or spare ribs for about 6. Pull the membrane off the back first, season generously, and judge doneness by the bend test rather than the clock.
Time and temperature by rib type:
| Rib type | At 225°F (107°C) | At 250°F (121°C) |
|---|---|---|
| Baby back ribs | 5 hours | 4–4.5 hours |
| St. Louis / spare ribs | 6 hours | 5 hours |
| Full spare ribs (untrimmed) | 6–7 hours | 5.5–6 hours |
| Beef ribs (plate/short) | 8–9 hours | 6–7 hours |
| Country-style ribs | 3–4 hours | 2.5–3 hours |
225°F is the traditional low-and-slow temperature and gives the best smoke ring. 250°F saves about an hour with very little difference in the result, which is why many cooks now prefer it.
Preparation — don't skip the membrane:
The 3-2-1 method, the best-known approach, designed for spare ribs at 225°F:
For baby backs, use 2-2-1 instead — they're smaller and 3-2-1 will overcook them into mush. This is the most common mistake with the method.
The wrapped stage is where ribs get tender, and the final unwrapped hour is what stops them going soft and steamy.
Wood choice:
A mix of hickory and apple is a reliable default for pork ribs.
How to tell when they're done. Not by time, and not really by temperature either:
"Fall off the bone" is technically overcooked. Competition ribs are meant to leave a clean bite mark while the rest stays on the bone. Plenty of people prefer them softer, which is fine — just know that's a choice, not the standard.
Saucing: if you want sauce, brush it on in the last 20 to 30 minutes. Any earlier and the sugar burns. Two thin coats work better than one thick one.
Resting: let them sit 10–15 minutes before slicing. Slice between the bones with the bone side up, where you can see exactly where the bones run.
Common mistakes:
No smoker? You can approximate this in an oven at 275°F for about 2.5–3 hours wrapped in foil, then finish under the broiler with sauce. You won't get a smoke ring, but the texture is close. For a longer cook on the same principles, see how long to smoke a pork butt.