I cut my trails slightly wider than a narrow logging road. My bridges are 12 feet wide with trail being between 12 and 15 feet wide and in some sections even wider. It sounds wide, but they are much safer that way. For low snow conditions Walk the land in the winter to see where the snow collects and route your trail appropriately. Pay attention to drainage.
Water can be a serious problem in low snow conditions.
Pay attention to which direction your exposed hills face. Southern facing hills will get a lot of sunlight and melt sooner. Avoid being close to white pine as they catch snow and shield the trail. However trails running in a field 20 feet from the edge of a north side of a white pine forest can get great protection from the sun. Make the trail as smooth as possible and remember to mow it before the winter so that grass and brush isn't poking through the snow.