What are the hours at the campground (when will the office be closed for the night)?

Office hours are M-Sat 9-6 and Sun 12-6, but camping guests are welcome at all hours with a reservation.

I want to say it is 6pm but there are a lot of campers coming in and out day and night. If you let the host know when you will be coming in i am sure they will be flexible. Nice couple.

Google the phone number and ask them