Baking chicken thighs with bone-in and skin-on will take longer than boneless skinless thighs. These times and temperatures are for bone-in and skin-on chicken thighs. 350°F (175°C)50 to 55 minutes 375°F (190°C)45 to 50 minutes 400°F (205°C)40 to 45 minutes 425°F (218°C)35 to 45 minutes The chicken thigh should reach the temperature of 165 degrees and the thickest part.