i was there Feb 24, 2019 and the roads were closed off to the campsites. there are NO campsites available (and probably won't be for some time), don't even think about it.
i talked to an employee at the 140 entrance booth, and he said there weren't any, i told him i had heard that Hodgon Meadows was open, he made a phone call right in front of me and said i was correct, except only a few. they were in the process of removing snow, so i suppose each day there could be more available?