Question: how long does it take to cook a whole frozen chicken in the oven?
Answer: Preheat oven to 425°.
Place in dry roasting pan and season to taste with Salt, Pepper, Garlic, and Rosemary (optional).
Bake uncovered for 15 minutes. ... 
Reduce heat to 350° and bake for an additional 3 hours, or until internal temperature of the thickest part of the chicken reads 165° or higher.