Sedona is probably your better bet. It's supposed to snow tomorrow a little heavier, and most of the trails have snow on them, it's semi-packed, but deep in some places where you really need a pugsly to take advanage of it and be albe to ride without sinking in. I could probably find some places to ride as it stands, but most of the trails have snow and you'd have to know what trails to hit that have extensive south-faces. Once it snows more, it might all be outta the question until a few days of sunshine (which is in the forecast).
I know 396 won't go well past the first few hundred yards, most of the trail is on the north slope, and there will probably be serious snow. ALL of the trails were probably rideable right after the snow, because you'd sink down close to the ground, but now with it being some what crusty and frozen underneath you tend to slide/spin more and just can't keep it going.
I'm sure there's more in granite basin that's doable, but you have to get up early when everything is pretty well frozen (including the ground). I cuold go out and do the fairly short ride I did yesterday, heck I'm pretty sure there are some more trails out there that could be ridden, but it's not going to work out real well. It's not like when we get a little snow and you can just keep riding with effect on the ride, we need a few steady days of sunshine.