I once skied up to Trail Camp in January. We got 6"-12" of snow that night. Soloing Muir the next morning was a bit dicey with all that fresh snow on it. Later that year (March 7), we skied from the Whitney summit all the way down to where they close the road for winter. Yes, you can hike up as far as you like.

Gary, it's becoming increasingly obvious that you are addicted. You need to move out west so you can play up high every weekend without buying a plane ticket or taking a day off from work. You can always fly back to Atlanta to watch the annual UGA pounding of GT on Thanksgiving weekend. Are you working on this?