Sunday Z. Rossberg

Sunday Z. Rossberg is a family law lawyer and the founder of Rossberg Law Office, L.L.C. in Great Falls, Montana, where she has maintained an active family law practice since 2000. Her primary work involves divorce, child custody and visitation, parenting plans, child support, spousal maintenance, military divorce, grandparents’ rights, domestic violence, and restraining orders. She represents families during contested transitions and focuses on the long-term effect that court orders and parenting arrangements can have on parents and children.

Sunday earned a B.A. in Communication Studies and Political Science from Carroll College in 1991 and received her J.D. from the University of Idaho, College of Law in 1995. She later completed the Trial Lawyers College program in 2009. Her education and trial training support a practice built around courtroom advocacy, negotiation, mediation, and communication in family disputes where legal issues are closely connected with finances, parenting responsibilities, and future family arrangements.

Sunday has experience beyond family law in wrongful termination, criminal defense, private business representation, real estate fraud litigation, personal injury, wrongful death, youth-in-need-of-care proceedings, and inmate civil rights. Early in her career, she worked on Walker v. State, a Montana Supreme Court case addressing the Human Dignity Clause. She has also been selected by other lawyers to mediate family disputes and has presented to attorneys on family law issues.

Sunday Z. Rossberg is a member of the Montana Trial Lawyers Association and the State Bar of Montana. Her practice combines family law concentration with broader trial, civil rights, injury, and mediation experience. She works with clients facing divorce, parenting, support, property, and safety issues that can shape family life for years. Her approach emphasizes individual attention, careful case preparation, and practical advocacy in negotiations, mediation, and court proceedings.

Law Office Affiliations

• Attorney, Rossberg Law Office, L.L.C.
• Member, State Bar of Montana
• Member, Montana Trial Lawyers’ Association

Licensed State

• Montana

Education

• University of Idaho, College of Law
  Juris Doctor (J.D.)
• Carroll College
  Bachelor of Arts (BA) in Communication Studies and Political Science

Awards & Badges