That was our understanding when we were there in December. You can exit after that time but not enter.... We arrived JUST before 6 and had not known about the limitation. The gate was still wide open and there didn't appear to be a camphost at that time. But I'm not sure if a ranger comes by and locks it at night.

Yes, unfortunately you cannot enter the the campground after 6pm. I’m sorry for that and I hope I helped you. Enjoy 😉.

Gate is closed and you can’t enter after 6 pm. Exit only after 6 pm, they have one way tire spikes.

They do lock the entrance gate, you can leave after hours but I believe there are spikes to stop you from entering through the exit. It is a fantastic camp spot the hikes are world-class and not to be missed. Definitely worth making the effort to get there before the gates are locked.

I don't remember seeing the gate much less it being closed. There is a ranger/host that drives thru in the evening but I don't think they lock a gate. Call them beforehand, I wouldn't do the road to the campground in the dark either!