Slow cooking pork ribs in the oven at 225°F (107°C) gives the meat time to turn tender while a simple spice rub builds savory flavor. This recipe uses baby back ribs, wrapped for most of the cook and finished with barbecue sauce; spare ribs work too, though they usually need longer.

Ingredients

2 racks baby back pork ribs, about 4 lb (1.8 kg) total
2 tbsp (25 g) packed light brown sugar
1 tbsp (8 g) smoked paprika
2 tsp (6 g) garlic powder
2 tsp (6 g) onion powder
1½ tsp (7.5 g) fine salt
1 tsp (2 g) ground black pepper
½ tsp (1 g) ground mustard, optional
½ cup (120 ml) barbecue sauce, plus extra for serving
2 tbsp (30 ml) apple cider vinegar or water

Instructions

Heat the oven and prepare the pan. Set a rack in the center of the oven and heat it to 225°F (107°C). Line a rimmed baking sheet with two layers of heavy-duty foil, leaving enough overhang to make a sealed packet around each rack. If using standard foil, use two sheets per rack to reduce the chance of leaks.
Remove the membrane and season. Pat the ribs dry. On the bone side, slide a blunt knife under the thin, shiny membrane at one end, then grip it with a paper towel and pull it off. Removing it helps the seasoning reach the meat and keeps the cooked surface from feeling tough; if it is already removed, proceed. Mix the brown sugar, paprika, garlic powder, onion powder, salt, pepper and optional ground mustard. Rub the mixture evenly over both sides of the ribs.
Wrap and slow-cook. Place each rack meat-side up on its own foil sheet. Fold the foil up around the ribs to form a snug packet, leaving a little space above the meat, and seal the edges well. Set the packets on the baking sheet and bake for about 3 hours 30 minutes. Keep the oven closed as much as possible; opening it repeatedly slows the cook.
Check tenderness and temperature. Open one packet carefully, directing the escaping steam away from your face and hands. Insert a thermometer into the thickest meaty section without touching bone. USDA FSIS lists 145°F (63°C) with a 3-minute rest as the safe minimum for whole cuts of pork, but ribs are much more tender when cooked well beyond that point. For tender ribs, aim for about 195–203°F (91–95°C), and check that a toothpick or probe slides into the meat with little resistance. If they are still tight or below that tenderness range, reseal and bake in 20-minute increments, checking again. Depending on rack size and the oven, the wrapped stage may take 3½ to 4 hours.
Sauce and finish. Carefully pour any liquid from the foil into a heat-safe container, then discard it; do not use it as a sauce without bringing it to a boil. Mix the barbecue sauce with the vinegar or water. Move the ribs to the foil-lined sheet meat-side up and brush on a thin layer. Turn the oven to broil and cook for 2–4 minutes, watching constantly, until the sauce bubbles and lightly caramelizes. Alternatively, bake uncovered at 425°F (220°C) for 8–10 minutes. Let the ribs rest for 5 minutes, then cut between the bones and serve with more sauce.

Tips

Use tenderness, not the clock alone. Rib thickness, starting temperature and oven accuracy all affect the timing. A thermometer helps, but the easy probe test is useful for deciding whether the connective tissue has softened enough.
Don’t add too much liquid. The ribs release moisture inside the sealed packet. The small amount of vinegar or water is for thinning the finishing sauce, not for pouring into the foil during cooking.
Make the rub your own. Use regular paprika instead of smoked paprika for a milder flavor, or leave out the mustard. If using coarse salt, measure by weight or use less by volume because it is less dense than fine salt.
Broil with care. Barbecue sauce can scorch quickly, especially if it contains sugar. Stay by the oven and remove the ribs as soon as the surface is glossy and browned.

Serving Suggestions

Serve the ribs hot, cut into individual bones or pairs, with extra barbecue sauce on the side. Creamy coleslaw, cornbread, baked beans, potato salad, corn on the cob or a crisp green salad all make good sides. For a less rich plate, choose a vinegar-based slaw and grilled or steamed vegetables. If serving outdoors, keep hot food hot and do not leave cooked ribs at room temperature for more than 2 hours, or 1 hour when the temperature is above 90°F (32°C).

Variations

Use spare ribs: St. Louis-style ribs are meatier and may need roughly 4–4½ hours wrapped at 225°F (107°C). Begin checking for tenderness around 3½ hours rather than relying on a fixed finish time.
Make them less sweet: Reduce the brown sugar to 1 tbsp (12 g), or omit it. The rub will taste more savory and will have less sweetness to balance a tangy sauce.
Change the flavor profile: Add ½ tsp (1 g) cayenne for heat, or replace the barbecue sauce with a vinegar-pepper finishing sauce. For a smoky flavor without smoked paprika, use a barbecue sauce that already has a smoky profile.
Finish on a grill: After the ribs are tender in the oven, brush with sauce and grill over medium heat for a few minutes per side. Watch closely; the sugar in the sauce can burn.

Storage and Reheating

Refrigerate leftover ribs within 2 hours of cooking, in a covered container or tightly wrapped, for 3–4 days. For longer storage, freeze them in airtight packaging for up to 2–3 months for best quality; thaw in the refrigerator. Reheat covered with a spoonful of water or barbecue sauce in a 300°F (150°C) oven until the thickest portion reaches 165°F (74°C), the USDA FSIS temperature for reheated leftovers. Smaller portions can be reheated in a covered microwave-safe dish, turning or rearranging them for even heating and checking the temperature with a food thermometer.

Frequently Asked Questions

How long do ribs take at 225°F (107°C)?
Baby back ribs commonly take about 3½–4 hours in foil, plus a few minutes to sauce and finish. Spare ribs may take 4–4½ hours or longer. Use tenderness checks because rack size and oven performance vary.

Should ribs be wrapped in foil?
For this method, yes. A sealed foil packet helps retain moisture and softens the ribs during the long cook. Unwrapped ribs develop a drier surface and can take longer, so use a recipe written for that approach if you want them unwrapped throughout.

Can I cook ribs at 225°F overnight?
It is not a good idea to leave the oven running unattended overnight. Cook them while someone can monitor the oven, check tenderness, and refrigerate them promptly after cooking if they will not be served right away.

Can I prepare the ribs the day before?
Yes. Season the raw ribs, cover them, and refrigerate for up to 24 hours before cooking. Keep raw pork separate from ready-to-eat foods, and wash hands and utensils after handling it. The cook time is not reduced by seasoning ahead.

Why are my ribs still tough?
They probably need more time for connective tissue to soften. Reseal the foil packet and continue cooking in 20-minute increments, checking the probe tenderness each time. A reading of 145°F (63°C) meets the safe minimum for whole pork cuts but does not mean ribs will be tender.

Can I use a slow cooker instead?
This recipe is designed for the oven, not a slow cooker. Slow cookers use different heat and moisture conditions, so follow a slow-cooker-specific recipe for timing and safe handling rather than transferring these oven directions unchanged.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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Slow Cooking Ribs in the Oven at 225°F