Posting so someone doesn’t make the same mistake as me. The monthly rate is for 30 days, So if you book a month that has 31 days make sure you add the extra day. It is stated on their website, I just missed it. The park and the host have been great. Unfortunately the site was already booked for that night. They did offer to move us to another site for the night. But it was easier to add a night to the first leg of our journey home.