I was there as recently as Monday. the trails were rather snow covered but certainly rideable. However, I would expect that they might be a bit muddy tomorrow with todays thaw and even warmer weather Friday. I would think the Grand Tour and Laurel Ridge Trails would be the most rideable, with the Rocky Point (the one directly accessible from the upper lot) being a bit messy.
If it is frozen, no problem. If it thaws, even a little, it will be snot on frozen base. Use common sense, try not to damage the trails, and we will all be happy.