The walk-in camp sites just below the main trail head parking area (above the overflow parking) are always accessible.
I would assume things being closed mean there is no garbage collection, so you should plan on hauling out your own. The water system may be shut down as well, so bringing in your own water, or using the stream might be necessary, too.
By the way, Sunday, 11/4 is the last day of business for Doug at the Portal store for this year.
