Infographic Apr 3, 2020

Yellowstone Pronghorn Project: Restoring Ancient Paths

Map (4.6 MB)

Fences have long been a barrier for Yellowstone pronghorn antelope, as they migrate to crucial winter habitat beyond park borders. Despite being the fastest land mammal in the Western Hemisphere, pronghorn are not built to jump. Fences in their historic migration pathways caused the pronghorn population in Yellowstone to plummet. By 2004, park biologists estimated that fewer than 200 remained in the northern herd. The small herd was extremely susceptible to disease and severe weather threatening the long-term survival of this population.

Since 2010, NPCA has worked with private landowners and public land managers to remove or modify fences along Yellowstone pronghorns’ historic migration routes in Montana’s Paradise Valley. Through the hard work of more than 1,000 volunteers, we have removed or modifi ed dozens of miles of fences. In turn, Yellowstone pronghorn populations are increasing, as the animals are able to reach larger portions of their historic winter habitat.

The Yellowstone herd remains genetically isolated from others. In response, NPCA has expanded its pronghorn program to include historic migration routes west of the park in Montana and Idaho. By expanding our work into restoring this critical pathway, we aim to reconnect Yellowstone pronghorn with other regionalherds. Learn how you can help at

Click to enlarge

Read more from NPCA

  • Blog Post

    Yosemite Valley to Herself, After a Wait

    Apr 2021 | By Kati Schmidt

    Parks including Glacier, Rocky Mountain and Yosemite are using reservation and timed-entry systems to help manage heavy crowds — a problem that long preceded the pandemic. While these changes…

  • Blog Post

    7 Places Worth Saving

    Apr 2021 | By Matthew Kirby, Jennifer Errick

    By protecting the areas surrounding national parks, the U.S. can build resilient landscapes that prevent the worst effects of climate change and species loss. But we must act soon…

  • Blog Post

    The Park That Made COVID Testing Possible

    Apr 2021 | By Jennifer Errick

    A bacterial discovery at Yellowstone 55 years ago has been key to the development of PCR testing, the most reliable way to know whether someone has COVID-19.