If your driving down from Kennidy Meadows Road you should be able to make it to the entrance. If your coming up from Route 178 then i would warn you of the steepness of the climb.
I am not sure of the road conditions this time of year. Chimney Peak/Basin Road is gravel. Not sure of the water or snow melt. Campsites near the entrance are hilly but there are a few level spots about midway back. There is creek that runs through the campground. Not sure if i would try it in the early spring.