The sites become first come first serve I believe and, but as others mentioned, the bath house is closed and there is none of the regular staff.
The park is open year round but not sure on camping. Check out the Michigan DNR website for the most accurate info.
Ft. Custard Recreational Area Campground is open all year round. Bathhouse is closed. So it's the Porta Jons.
Mountain biking is open all year too.
Yes Oct15, but they do have dog sled raceing, and ice fishing. Some land is open for hunting, you can cross country ski, and shoe shoe.
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