Coggins Test

To prevent the spread of equine infectious anemia (EIA), all stock (horses, burros or mules) within Yellowstone National Park must have a negative EIA or Coggins test within the last 12 months. If you are anywhere in Yellowstone National Park, whether on a day ride or an overnight horse trip, your stock must be tested and you must carry proof of a negative Coggins test for each animal. Photocopies of Coggins tests are acceptable in the backcountry. This regulation applies even if you are:

  • Not crossing state lines
  • Not passing through an entrance station
  • Just driving through and not stopping
  • Entering the park from a backcountry trailhead

If you are planning to stay overnight in the backcountry, you must obtain a backcountry permit.

You can obtain a permit at any backcountry office or contact the Central Backcountry Office at 307-344-2160.

For more information or questions on horseback riding in the park contact the Central Backcountry Office at 307-344-2160.

Please make sure that the date blood drawn (within 12 months of current date), the laboratory name & negative test results, and identifying features of each animals (name, brand, identifying markings or scars) and are legible on your Coggins forms.

Sample Coggins Test Form
Sample Coggins Test Form

Last updated: June 9, 2017

Contact the Park

Mailing Address:

PO Box 168
Yellowstone National Park, WY 82190-0168



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