You will be alerted to openings at your selected campground for the date and duration you chose up until the date passes. If you receive an alert and miss the availability, you might have another opportunity to book, but we can't guarantee availability becoming open again. Availability is not saved for you - it simply alerts you that there is an opening. Once you get an alert for a popular campground, you'll want to try to snag it right away! You won't be notified if a campground becomes unavailable.