Got out last night, I was the first tracks on it since the last snow. The trail is in great shape, smooth surface 1" of soft snow on the top, decent traction. I did the complete loop in 1:05.
With the heavy tree cover at Blue Mounds and the fact that the majority of the trail is on the east and the north side of the mound, the trail surface usually holds up well.
Weekend temps look to be on the edge of freezing, but the with the cloud cover the trail - should be/might be - in good shape early Saturday (possibly only early) and if the forecast holds might be good all day Sunday. This is only an educated guess, keep an eye on the temps and the sun, but we might have some opportunities for great biking this weekend.
If you do head out please post, it's nice for others to know that it's worth the trip over here for some great winter biking