I was able to book 4th of July week 2019 at Curry Hammock in the Keys. Had to do it exactly 11 months prior to the start of the trip, I believe the site opens at 7am. Wasn't much left. If I was coming in sooner, I could have booked sooner. Might be best to book 14 days prior to the end of your trip just to get in, then cancel the days that you don't need. 14 days is the max stay. So with us leaving on Sunday July 7th, I could have booked June 23rd and had more choices or gotten in to Bahia Honda (that was my first choice). I could have shaved off the days that I didn't want later. Actually, Curry has good reviews, and because of the almost constant winds (wind surfers love it) there are less no-see-ums than most other Florida parks. Looking forward to this first time to the Keys!!!