From Yellowstone National Park:

There have been fewer visitors making the trek to Yellowstone this year. So far in 2017, the park has seen 1,353,636 visitors, down 5.48% from the same period in 2016 (which was the highest on record).

Yellowstone hosted 803,298 visitors in June 2017. Making it the second busiest June on record, down 4.8% from June 2016, which saw 838,316 visitors. Year-to-date visitation in 2017 is 24.8% higher than it was 5 years ago in 2013.

The continued high level of visitation at Yellowstone underscores how important it is for visitors to plan your trip to the park. If you plan on visiting the park, please anticipate delays at popular attractions, plan ahead, and check road conditions on the park's website.

Detailed visitation information and additional information on how these statistics are calculated is available here.