Chorro Grande is covered, was 2 weeks ago at least, but the road won't be open to Pine Mtn I don't think. Not sure how the current rain effects the snow up there, really depends on temp.
As far as Gridley/Pratt/Sizar there might be some snow but I think that with all the rain coming down right now it would be a better bet to wait it out a bit before trying to ride here, you'll end up tearing up the trails I think...let me know if/when you're in the area, I'm off school until early Jan. and would love to ride.