How Long to Cook Ribs in the Oven With Dry Rub at 275°F

Dry-rubbed baby back ribs are pork ribs coated with a savory, lightly sweet spice mixture and cooked gently in the oven until tender. At 275°F (135°C), plan on about 3 hours in the oven for two racks, plus 10 minutes to rest; wrapping them for most of the cook helps keep the meat moist while the rub builds flavor.

Ingredients

2 racks baby back ribs, about 4–5 lb (1.8–2.3 kg) total
1 tablespoon (15 ml) neutral oil, or 1 tablespoon (15 g) yellow mustard, to help the rub stick
2 tablespoons (25 g) packed brown sugar
1 tablespoon (7 g) smoked paprika
2 teaspoons (10 g) kosher salt
2 teaspoons (5 g) ground black pepper
1½ teaspoons (4.5 g) garlic powder
1½ teaspoons (4.5 g) onion powder
1 teaspoon (2.5 g) chili powder
1 teaspoon (2 g) dry mustard powder, optional
¼ teaspoon (0.5 g) cayenne pepper, or less to taste
½ cup (120 ml) barbecue sauce, optional, for glazing

Instructions

Heat the oven and prepare the pan. Set a rack in the center of the oven and preheat it to 275°F (135°C). Line a rimmed baking sheet with heavy-duty foil, or use two overlapping sheets of regular foil per rack so the packets are less likely to leak. You will wrap the ribs separately. The oven can heat while you prepare the meat and spice mixture.
Remove the membrane and dry the ribs. Turn each rack bone-side up. If a thin, shiny membrane is still attached across the bones, slide a butter knife under one edge, grip the loosened piece with a paper towel, and pull it away. Removing it lets the seasoning reach the meat and makes the cooked ribs easier to bite. If the membrane is already gone, leave the rack as it is. Pat the ribs dry with paper towels and trim any dangling pieces of fat.
Mix the dry rub. Stir together the brown sugar, smoked paprika, salt, black pepper, garlic powder, onion powder, chili powder, dry mustard if using, and cayenne in a small bowl. Break up any lumps of brown sugar so the rub distributes evenly. Taste a pinch before it touches the raw pork; adjust the cayenne or pepper now if you prefer a milder or hotter blend.
Season both racks. Brush or rub a thin coating of oil over the meaty sides and edges, or spread on the mustard. The mustard is a practical binder, not a strong mustard-flavored coating; it becomes subtle as the ribs cook. Sprinkle the rub over both sides, using your fingers to press it onto the surface. Arrange each rack meat-side up on its own sheet of foil. Do not leave a thick mound of seasoning in one spot, because it will form an uneven crust.
Wrap and bake until tender. Fold the foil around each rack to make a sealed packet, leaving a little space above the meat rather than pressing the foil tightly against it. Set the packets on the rimmed baking sheet and bake for 2 hours 45 minutes. Open one packet carefully, directing the hot steam away from your hands and face. The meat should have pulled back slightly from the bone ends, and a thin skewer or the tip of a knife should slide into the meat with little resistance. If it still feels firm, reseal the packet and bake for another 15–20 minutes before checking again.
Check temperature and finish the surface. For food safety, USDA FSIS gives 145°F (63°C) with a 3-minute rest as the safe minimum internal temperature for whole cuts of pork; check with a food thermometer in the thickest meat without touching bone. Ribs are usually cooked beyond that minimum so the connective tissue softens and the meat becomes tender; a reading around 195–203°F (91–95°C) is a useful tenderness guide, but the skewer test matters too. Carefully remove the foil and pour away excess liquid. If using barbecue sauce, brush on a thin layer. Return the ribs uncovered to the oven for 15 minutes to set the surface. For a more browned finish, broil briefly instead, watching constantly because sugar in the rub or sauce can burn quickly.
Rest and slice. Transfer the racks to a cutting board and let them rest for 10 minutes. Slice between the bones with a sharp knife, wiping the blade if sticky sauce builds up. Serve the ribs warm, with extra sauce at the table if desired.

Tips

Choose the right rib cut. This timing is for baby back ribs, which are generally smaller and leaner than spare ribs. Spare ribs or St. Louis-style ribs often need roughly 45–75 minutes more at the same oven temperature, depending on their size. Use tenderness cues rather than relying only on the clock.
Keep the salt quantity in view. Kosher salt crystals vary by brand, so the gram measurement is the most consistent guide. If using fine table salt, use about 1½ teaspoons (7–8 g) rather than the full 2 teaspoons, or the rub may taste too salty. If your ribs are already injected or brined, reduce the salt further.
Swap spices without changing the method. Regular sweet paprika can replace smoked paprika for a gentler, less smoky flavor. If you do not have mustard powder, leave it out; the rub will still work. For less heat, omit the cayenne. These changes affect flavor, not the oven timing.
Do not rush the covered cook. A high temperature can brown the sugar before the connective tissue has time to soften. Keep the oven low, make sure the foil packet is closed, and allow extra time if a thick rack is still tough. Avoid repeatedly opening the packets, since each check releases heat and steam.

Serving Suggestions

Serve the ribs as the centerpiece of a casual dinner with classic sides such as coleslaw, cornbread, baked beans, or potato salad. For a lighter plate, add a crisp green salad, grilled or roasted corn, or vinegar-dressed cabbage to balance the sweet, smoky rub. If you glaze the ribs, put a small bowl of extra barbecue sauce on the table rather than brushing on a heavy coating; the dry rub should still be noticeable. For a gathering, slice the racks just before serving and arrange the pieces on a warm platter so the cut sides do not dry out.

Variations

More savory and less sweet: Reduce the brown sugar to 1 tablespoon (12 g) and add ½ teaspoon (1 g) ground cumin. This makes the rub less candy-like and brings out the paprika and pepper. More heat: Increase the cayenne to ½ teaspoon (1 g), or add ½ teaspoon (1 g) chipotle powder for a smoky chili note. No barbecue sauce: Skip the glaze and serve the ribs straight from the oven; the seasoned crust is flavorful on its own. Use spare ribs: The same rub works on spare ribs, but expect a longer covered bake. Start checking around 3½ hours total in the oven, then continue in 15–20-minute increments until a probe slides in easily. These are flavor and cut adjustments, not a reason to raise the oven temperature.

Storage and Reheating

Refrigerate cooked ribs within 2 hours of cooking. Once they are cool enough to handle, store them in an airtight container or wrap them well and refrigerate for 3–4 days. Keep sauce in a separate container if you want the crust to stay less sticky. For longer storage, freeze the ribs in meal-size portions for up to 2–3 months for best quality; thaw them overnight in the refrigerator before reheating.

To reheat, place the ribs in a baking dish with a tablespoon or two of water, broth, or barbecue sauce, cover tightly with foil, and warm in a 300°F (150°C) oven until hot throughout. The time depends on the portion size, but allow about 20–30 minutes for a rack or large pieces and check with a food thermometer. USDA FSIS recommends reheating leftovers to 165°F (74°C). You can uncover the dish for the final few minutes if you want to refresh the surface, but keep an eye on any sugary sauce. Reheat only the portion you plan to serve.

Frequently Asked Questions

How long do ribs take in the oven at 275°F?

For baby back ribs, allow about 2 hours 45 minutes covered, followed by 15 minutes uncovered to set the surface, for roughly 3 hours of oven time. Add 10 minutes of resting before slicing. Rack size and thickness vary, so begin checking tenderness at the stated time and continue in short increments if the meat still feels firm.

Should ribs be covered while they bake?

For this method, yes: wrapping the racks in foil for most of the cook traps steam and helps the ribs become tender without drying out. Open the packets carefully because hot steam escapes. The final uncovered 15 minutes lets the outside dry slightly and gives barbecue sauce, if used, a chance to set.

How can I tell when oven ribs are done?

Look for meat that has pulled back a little from the ends of the bones, and test the thickest section with a thin skewer or knife. It should enter with little resistance, while the rack should bend when lifted but not fall apart just from handling. A thermometer confirms the pork has passed the USDA FSIS safe minimum of 145°F (63°C) with a 3-minute rest; ribs are commonly cooked hotter for tenderness.

Can I cook ribs at 300°F instead?

Yes, but the timing will be shorter and may vary with the rack. Keep the ribs wrapped and begin checking for tenderness after about 2 hours 15 minutes, then finish uncovered for 10–15 minutes if needed. Do not use the 275°F timing unchanged at a higher temperature, and keep the thermometer and tenderness checks in mind rather than assuming they are ready at a particular minute.

Can I make the dry rub ahead of time?

Yes. Mix the dry ingredients and keep them in a sealed, labeled container in a cool, dry cupboard for up to 3 months for best flavor. Apply the rub shortly before baking, or season the ribs and refrigerate them covered for up to 12 hours. If the seasoned ribs are chilled, place them in the oven straight from the refrigerator and judge doneness by tenderness, allowing extra time if needed.

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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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