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Bake the ribs: Set the oven to 300Â°F. Move the ribs to an oven rack in the middle of the oven. Roast for 2 1/2 to 3 hours for spare ribs or 1 1/2 to 2 hours for baby back ribs. Halfway through cooking, cover the ribs with aluminum foil to protect them from drying out.
1 Preheat the oven to 200 degrees Fahrenheit (93 degrees Celsius). Cook 6 to 8 hours. 2  Preheat the oven to 225 degrees Fahrenheit (107 degrees Celsius). Cook the ribs for 5 to 6 hours.  Preheat the oven to 325 degrees Fahrenheit (162 degrees Celsius). Cook the ribs for 3 to 4 hours.