How long does it take to cook a chicken at 300 degrees?

Online Answer
Place in a preheated 300-degree oven for three hours. I've also roasted chickens at 275 for 4 hours and at 250 for 5 hours. It depends on how much time you have that day. Temperature should read 165 degrees when an instant read thermometer is inserted into the thickest part of the thigh without touching the bone.
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