Not sure. It depends on what u consider late night. Best to contact the office. Usually once u have registered on line and have paid for ur reservation , someone will surely check to c if u arrived overnight.and had no other options in case u missed the latenight check in.for security purposes. A new system has been istalled so past season"s rules may be outdated
I'm sure you can. I don't exactly know the details, but most parks do have late check in policies. You'll have to check the website and or call the rangers.
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