12 months is as far in advance as they will let you do a reservation.
You can make them more than a year out. The busy times like the holidays are hard to get. We started last Jan and it took us months of searching to piece together 5 days at a preferred site over Chrismas.
If my memory serves me right - Fort Wilderness camping is something like 180 days. The sooner you make them the better!
For resorts a day or so. If you don't show up within a day your reservation will be cancelled
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