Technically, foxes do not hibernate during the cold winter months. They keep to themselves during fall and early winter and can be found staying within a one to two mile radius when searching for food in the area. Occasionally they might extend this range if food happens to be scarce.
Although foxes do not hibernate during winter, they will take refuge during extreme weather conditions and can be found reducing their activity levels and taking shelter for a day or two until the weather gets nicer. Once the weather has calmed down enough they are able to go back outside to search for food and carry about their normal fox business.