The Porcupine herd range covers , from the calving grounds, the Porcupine River after which they are named, to the river valleys and slopes in the Ogilvie and Richardson Mountains in the Yukon and the southern Brooks Range in Alaska.: The calving area is located on in the Porcupine River coastal region of the Beaufort Sea known as the 1002 area, which is part of the Arctic National Wildlife Refuge. The area runs through a large part of the range of the Porcupine herd.