Montana sues Yellowstone National Park over new bison management plan

Montana’s governor as well as two state agencies have now sued Yellowstone National Park over bison herd management.

They argue that the plan violates federal law.

The lawsuit says that the park’s bison herd has grown in size and led to the increased spread of brucellosis, a highly contagious bacterial disease that can impact livestock.

Under the 2024 plan, Yellowstone’s bison population will be managed between 3,500 and 6,000 animals, a far jump from the 3,000 animal goal set in the year 2000.

Yellowstone’s Superintendent argues research has come a long way since that last bison management plan and this new plan solidifies that progress.

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The trustees’ 2025 annual report, released June 18, cited a law enacted this year as the primary reason why the funds are projected to run out a year earlier than previously projected.
“Sometimes populations correct on their own. That seems to be what is happening here.”