Everglades and Big Cypress camping in Feb. - availability?

There are boondocking spots in the Great Cypress Swamp and there is one State park: Collier-Seminole. I'm sure there are commericial cg too, probably in Everglades City. But I just read a message from someone else who said he never needed reservations but this year everything is booked up. So I'd call or check the web for availablity. After April it won't be as much of a problem when the snowbirds head north.