the smaller trails are not groomed. the main trails are groomed because they are part of the snowmobile trails. still makes for some good riding but not alot of miles. worth it (imo) if you don't have to travel too far to get to Jericho.
Do a loop going clockwise. ride up to the warming hut, take a break and warm up. Then ride the loop counterclockwise. Good way to kill an afternoon.