Remove giblets from chicken. Rinse chicken inside and out, and pat dry with paper towels. Place the chicken in a roasting pan.
Brush the chicken with olive oil. Combine salt, pepper, thyme, and rosemary in a small bowl. Sprinkle the mixture over the chicken, rubbing it into the skin.
Place the halved lemon and garlic head inside the chicken cavity.
Roast the chicken for 1 hour and 15 minutes, or until the internal temperature reaches 165 degrees F (74 degrees C) in the thickest part of the thigh.
Let the chicken rest for 10 minutes before carving and serving.
Notes
Serve with roasted vegetables or a simple salad for a complete and delicious meal.