Every season in Yellowstone sees big changes to what’s happening in the park and what services are available for people to enjoy. July and August are the only months when all facilities, roads, and services are open. Every other month brings a mix of options as the park prepares for, settles into, and then digs out of winter. Once roads open for the summer season, they are not gated at night and people may enter/exit the park 24 hours a day, seven days a week.