Snowmobile map highlighting trails and winter recreation opportunities in the Targhee National Forest, Island Park, Ashton and all of Fremont County. Snowmobile Trails. Oconto County Tourism – 1-888-626-6862 Website. Oconto County has over 400 miles of snowmobile trails! We are less than a full tank of gas round. Download Map of the Northern Oconto County Snowmobile Trails, click here!. Dates are subject to change depending on weather and trail conditions….