We’ll heads up that the only NY State DEC campground open after 10/9 is Fish Creek, NW of Saranac Lake (till 10/22). The DEC (Dept. of Enviromental Conservation) runs all 43 of the state public campgrounds in the Adirondack Park.

http://www.dec.ny.gov/outdoor/7825.html

When closed, they shut off all water. I’ve no clue if they allow stealth camping - I.E. putting down a tent, no fee etc... as I’m pretty sure there are no attendants and the toilets are all privys. You can call and ask. I think possibly the Forked Lake sites might be open (south of Long Lake), as folks doing the Fulton Chain canoe route use the sites there. There are 3 or 4 sites at Forked that are right at the dock area. So road accessable.

Outside of the DEC public campgrounds, the towns run some. Possibly some county sites as well. There’s also a huge amount of primitive campsites scattered throughout the “Forest Preserve”, used typically by hikers and canoe trips, just not many that are on paved roads (none that I’m aware of), or easily accessable. There are a few along the Floodwood dirt road west of Saranac Inn, as well as down in the Essex Chain on some on the bikeable dirt roads south of Newcomb. There’s also a ton of free sites in the Moose Plains region, south west of Indian Lake.

Note that it’s currenly hunting season so many of the primitive sites might get used up. It’s all first come, etc...

Maybe some private campgrounds, there’s a ton of those.