The route I used started by parking at the first campsite past Lincoln Woods - the name escape me at the moment. From that point, you walk a couple of hundred yards down the road (back towards Lincoln Woods), and then cross the river. It's a substantial river, so personally I'd wait for more cold weather. This is a river you want to walk over - not ford or walk over. Once across the river, you climb a ridge which will narrow and lead you to the summit. As bushwhacks go, it's pretty straightforward, and when I did (about 10 years ago) not too brushy/dense - not at all like the infamous summer route from the other side of the mountain at East Pond.
I believe this is still a viable route, as I hear "new" winter peakbaggers working on the NE100HH mention taking this route in recent years. Maybe someone will chime in here to comment upon whether a winter route from Loon is a viable alternative.