Worst time to visit Yellowstone

November is the gap between two seasons

Yellowstone has a problem that a weather chart will not show you. Most park roads close to regular vehicles in early November so snow can build up, but groomed roads do not open to snowcoaches and guided snowmobiles until mid-December. For about six weeks, almost nobody can reach Old Faithful, Grand Prismatic Spring or the Grand Canyon of the Yellowstone.

November is also the quietest month, at about 14,000 visits, against 948,000 in July. The National Park Service lists few facilities open, with winter storms bringing snow and freezing temperatures. At Mammoth, highs average about 39°F (4°C) and lows about 19°F (-7°C).

What still works in November

If your dates are fixed, the northern road from Gardiner to Cooke City stays open. The park suggests hiking and wildlife watching in the north at this time of year, with wolves in Lamar Valley and the bighorn sheep rut. Base yourself in Gardiner, where to stay on that road, and check the Yellowstone weather forecast before you drive.

Late March and April: the second gap

The same gap opens in spring. Groomed roads begin closing for plowing from early March, and the first roads do not reopen to cars until mid-April, weather permitting. In 2026, the West Entrance to Old Faithful road opened on April 17, but the East and South entrances followed only in May. Few facilities are running, and snow is still likely in many areas.

It does have rewards for the well prepared: bison calves in Lamar Valley, bears leaving their dens and very few people. It is just not the trip most first-time visitors picture.

July is the worst time for crowds

If your worry is people, not closures, the worst month is July. An average July brings about 948,000 visits, close to a quarter of the year. August follows at about 840,000. Expect full parking areas at Old Faithful, Grand Prismatic and the canyon from mid-morning, and traffic that stops when bison cross the road.

It is still a good month in every other way, as all facilities are open and it is the warmest time of year. Reach an entrance before 7 am, as the park advises, and stay away from the main sights between 10 am and 4 pm.

Other things to watch for

• Afternoon storms. Thunderstorms are frequent in July, so get off exposed trails by early afternoon.
• Wildfire haze. The park warns of haze in July and August, which can spoil views and photos.
• Mid-October. Dunraven Pass usually closes, cutting the direct road between Canyon and Tower, and more services shut each week.
• Road work. Construction runs every year once the snow clears, so check for delays on the park roads page.

When to go instead

September is the best swap: roads are typically all open, days are mild and visits run about 30% below July. See the best time to visit Yellowstone for all twelve months. If you were hoping for snow, move your trip into Yellowstone's winter season, from late December to early March, when oversnow routes reach the geyser basins.