Rode A, B & C today. Snow was between 1-3", with older tracks to follow through most of it. I thought the traction was fine with normal summer tires, and was able to climb all of the hills except one short & steep uphill w/turn on loop C where I spun out. Didn't have time to ride D, but some friends rode it today - they said that there were no tracks to follow (but now there are).
Get out and ride!