If it hasnt snowed/rained for a couple days it should be fine. I rode up there a week ago, and no problems. Some snow on the sides of the road etc., but perfectly safe for riding, especially if its after early morning.
To answer my own question.... Not too bad, lots of snow on the sides of the road. Some icy patches towards the bottom. The top was salted and the sun had taken care of the rest. The road was closed from the rest area on up. The rest area car park was a bed of snow and ice, but the cocoa was hot!