The last day for visitors to drive most of Yellowstone National Park’s roads will be Thursday, Oct. 31. The National Park Service said in a news release that the West, South and East entrances and nearly all roads will be closed to regular vehicle trafficNov. 1. The park annually closes roads at this time of year to prepare them for the winter season and snowmobile and snowcoach travel, which will begin Dec. 15. Visitors planning to drive in the park during the fall and winter should: Prepare for changing weather conditions, have flexible travel plans, and anticipate possible road closures due to inclement weather and dangerous driving conditions.