There is a sign for Old Rag Mountain. Stay on this main road, passing through the community of Nethers. You'll reach the Old Rag parking area on your left in 2.6 miles. The loop starts here. If you choose to camp while on the loop, you will have to get a permit first.
Campgrounds are available along the drive, as well.
Maps are available in the park and from local outfitters. It is advisable to carry water on this hike, since no water is available until the Old Rag Shelter a good ways after the summit. There oughta be a law against the hectic pace of life in the capital. Inc. All rights reserved.