The best time to go to Billings is during the shoulder seasons of May, June, September, and October.These months offer pleasant weather, with moderate temperatures that are ideal for exploring the outdoors without the intense heat of summer or the cold of winter. You'll find fewer crowds compared to the peak summer months, meaning a more relaxed experience at popular attractions and potentially better availability for accommodations.For those planning to visit the nearby national parks, particularly Yellowstone National Park, May and September are excellent choices. During May, the park is beginning to fully open, and wildlife viewing opportunities are plentiful as animals are very active. September offers stunning autumn colours and a quieter park experience after the summer rush.If your trip is focused on events and outdoor activities within Billings itself, June and October are also great.