• Visitors stand on the boardwalk of Grand Prismatic, the park's largest hot spring which is ringed with orange, brown and yellow runoff channels.

    Yellowstone

    National Park ID,MT,WY

Required Ranger Contacts

You are required to notify the district ranger in charge of your work area/s ONE WEEK in advance of your trip via the Researcher Check-In webpage. If you have trouble completing the required check-in, call the Research Permit Office at (307) 344-2234.

Did You Know?

Seventh Cavalry Ensignia Pin.

Prior to the establishment of the National Park Service, the U.S. Army protected Yellowstone between 1886 and 1918. Fort Yellowstone was established at Mammoth Hot Springs for that purpose.