The Thorofare and South Boundary Trail is a 67.5 mile moderately trafficked point-to-point trail located near Yellowstone National Park, Wyoming that features a lake and is only recommended for very experienced adventurers. The trail offers a number of activity options and is best used from March until September. Horses are also able to use this trail.
Yellowstone closes trails annually to reduce encounters between bears and humans during certain times of the year. See here for bear closure info: https://www.nps.gov/yell/learn/management/bearclosures.htm
Additionally, roads in Yellowstone are closed annually during winter. Before you head out, see Park road closures here: https://www.nps.gov/yell/planyourvisit/parkroads.htm
Yellowstone National Park charges a fee to enter. Fees are $35 per vehicle or $30 per motorcycle. If you are entering on foot, horse, or bike the fee is $20 per person. You can also purchase a park specific annual pass for $70.