No reservations can be made 4 days or less, prior to your arrival date.
People are checking in and out of sites all the time, this is why we have a 4-day cut off, otherwise we would have people making reservations at the same time as people are checking in to a site and then we would have double bookings.
Due to no reservations being made with in 4 days of your arrival date, this may increase the number of sites available to FCFS campers due to last minute cancellations.