Feb 09

112 Yellowstone bison transferred to Fort Peck Tribes


112 Yellowstone bison transferred to Fort Peck Tribes

MAMMOTH HOT SPRINGS, WY – During the week of January 10, the National Park Service (NPS) and Animal and Plant Health Inspection Service (APHIS) completed the transfer of 112 Yellowstone bison to the Fort Peck Indian Reservation in Poplar, Montana. The movement of these animals constitutes the single largest transfer to date under the park’s Bison Conservation Transfer Program. The program has led to the largest relocation of live Yellowstone bison to American Indian Tribes in history.

Since 2019, a total of 294 bison have been transferred from Yellowstone to the Assiniboine and Sioux Tribes at Fort Peck. Approximately 170 of those bison have then been further distributed to 23 Tribes across 12 states in partnership with the InterTribal Buffalo Council.

The bison transferred last month were a large family group of seven males, 53 females and 52 calves. All completed Phases I & II of the brucellosis quarantine protocol at Yellowstone National Park and the APHIS facilities and will finish assurance testing (Phase III) at Fort Peck (see information below for details about the protocol).

This transfer is the result of many partners working together: the NPS/Department of the Interior, Assiniboine and Sioux Tribes of the Fort Peck Indian Reservation, APHIS/United States Department of Agriculture, the State of Montana, InterTribal Buffalo Council, Yellowstone Forever, Defenders of Wildlife and the Greater Yellowstone Coalition.

Yellowstone National Park partnered recently with Yellowstone Forever and the Greater Yellowstone Coalition to more than double the capacity of the facility within the park. The park and APHIS intend to enter 250 new animals into the program this winter.

“We greatly appreciate the tremendous number of partners who have come together to make the Bison Conservation Transfer Program a success,” said Superintendent Cam Sholly. “It is important we continue to look for opportunities to build on the success of this program in order to move larger numbers of disease-free bison to Tribes across the country, while also achieving our future goal of eliminating shipments to slaughter.”

Background information about quarantine

Quarantine was included as a possible tactic for bison management back in 2001 when the Interagency Bison Management Plan (IBMP) was signed by the Secretaries of Interior and Agriculture and the Governor of Montana. The National Park Service formally pursued a quarantine program in 2014 by initiating a public planning process. The operational quarantine program was approved in May 2018.

APHIS and DOL established the final structural specifications and biosecurity requirements for quarantine facilities in June 2017. The only facilities that currently meet those specifications are located at Stephens Creek in Yellowstone National Park, Corwin Springs in Montana, and the Fort Peck Reservation.

APHIS developed the quarantine protocols in October 2003 and validated them during 2005-2010. Quarantine has three phases:

  • Phase I – Managers capture bison in or near the park during winter. Bison considered suitable for quarantine based on initial negative tests for brucellosis are isolated in double-fenced quarantine pastures and tested every 30-45 days until all bison test negative for two consecutive testing periods.
  • Phase II – Bison in these individual test groups undergo brucellosis testing by age and sex requirements described in the 2003 Brucellosis Eradication: Uniform Methods and Rules (APHIS 91–45–013) and are certified as brucellosis-free.
  • Phase III – Managers can transfer bison to other fenced pastures. In the new location, brucellosis tests are conducted at six and 12 months to provide additional assurance. Managers keep these bison separate from other animals at least until the six-month test is completed. Thereafter, managers can release these bison on public or tribal lands for conservation and cultural purposes.

Editor’s note: News media, be sure to view the “Why are Yellowstone bison controlled” video.

About the National Park Service. More than 20,000 National Park Service employees care for America’s 423 national parks and work with communities across the nation to help preserve local history and create close-to-home recreational opportunities. Learn more at and on Facebook, Instagram, Twitter, and YouTube.

The Fort Peck Reservation is home to two separate Native American nations, the Sioux and the Assiniboine, each composed of numerous bands and divisions. The Reservation is in the extreme northeast corner of Montana, on the north side of the Missouri River. Learn more at

National Park Service
U.S. Department of the Interior
Yellowstone National Park

P.O. Box 168
Yellowstone National Park, WY 82190

Morgan Warthin
(307) 344-2015
[email protected]

Public Affairs Office
Strategic Communications, Office of the Superintendent
Yellowstone National Park
Office: 307-344-2015
Hours: 8:00 a.m. – 5:30 p.m. M-F