Bob R hiked to Bighorn Park / Outpost Camp on March 31. His pictures are here: 2013-03-31 Whitney trail
Bob reported: Ranger at the Visitor Center told him the CHP had been up the road a few days ago and ticketed all the cars, but they drove up to the Portal. The road has been completely cleared already, even with some asphalt patching done.
They encountered the first major snow about two miles up the trail. Below are pictures from Bob's set:
North fork of Lone Pine Creek, and first snow patch