Don't waste your time at Allamuchy. It's full of heavy snow and ice. (At least on the Tranquility side).
Here's an alternative to full road riding, or as I like to call it, almost mountain biking -- take your single speed or regular mountain bike and ride the length of Waterloo Valley Road. The road runs from the Trade Zone in Mount Olive, alongside Stephen's SP and goes almost to Hackettstown. It is a hillly crappy road full of potholes, snow & ice. No cars really use it. You can crank out about 7 miles of "not quite" road riding or "almost mountain biking". Hey, it beats the trainer!