For more than 100 years, Big Brothers Big Sisters has operated under the belief that inherent in every child is the ability to succeed and thrive in life. As the nation's largest donor and volunteer supported mentoring organization, Big Brothers Big Sisters makes meaningful, monitored matches between adult volunteers ("Bigs") and youth ("Littles") in communities across the country. We help develop positive relationships that have a direct and lasting effect on the lives of young people.


A dedicated group of Yellowstone County residents founded Big Brothers Big Sisters of Yellowstone County in 1974. Today, our organization serves over 100 youth in our community.


Our work is as urgent now as it was at our founding. Together, our board, staff members, and community partners strive to defend the potential of every child in Yellowstone County. 



Create and support one-to-one mentoring relationships that ignite the power and promise of youth.



All youth achieve their full potential. 



By partnering with parents/guardians, volunteers, and others in the community, we are accountable for each child in our program achieving:


Higher aspirations, greater confidence, and better relationships


Avoidance of risky behaviors


Educational success


Upcoming Events