There are lots but they fill up quickly--and if someone is hiking the full loop, they could be gone 3-4 hours. The geography of it is very remote for the DC area. For the folks who are citing Old Rag materials: I haven't hiked White Oak but have done Old Rag. The two trails are different in difficulty--for example, Old Rag bans pets and includes a rock scramble/hand over hand climbing, whereas the maps I've seen for White Oak indicate it's a moderate trail. This is definitely not to say that you couldn't slip and fall over an edge somewhere.