The best times to visit Yellowstone National Park are from late April to May as well as September through early October. These shoulder months offer mild weather, fewer crowds and little to no road closures.
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If you're wondering when is the best time to visit Yellowstone National Park, among the park's diverse seasons, June is a prime time to go. Abundant wildlife sightings, pleasant weather and lighter crowds ahead of the summer rush mean there's no better time to enjoy this American legacy.
Flights to the nearest major airport — that of Jackson Hole, Wyoming — are typically cheapest between November and March, which is the park's low season. Prices for lodging begin to drop after Labor Day, once the summer crowds have diminished and children are back in school.
Hot springs have injured or killed more people in Yellowstone than encounters with wildlife. Boardwalks and trails are there to protect visitors, and off-boardwalk hiking is very dangerous - scalding water underlies most of the thin, breakable crust around hot springs.
Even in peak summer season, it's possible to avoid crowds. The trick is to be either an early bird or late afternoon adventurer. Yellowstone is normally busiest from 9 a.m. to 3 p.m., and the stretch between Yellowstone's West Entrance to Old Faithful usually has the most traffic.
The world's most famous geyser, Old Faithful in Yellowstone, currently erupts around 20 times a day. These eruptions are predicted with a 90 percent confidence rate, within a 10 minute variation, based on the duration and height of the previous eruption.