Kate White was first elected to the Yukon Legislative Assembly in the general election for the 33rd Legislative Assembly on October 11, 2011. She was re-elected in the general elections for the 34th Legislative Assembly on November 7, 2016, and the 35th Legislative Assembly on April 12, 2021.
Kate White has been the leader of the Yukon New Democratic Party since May 2019. During the 34th Legislative Assembly, she was also the Third Party House Leader.
Kate White is Chair of the Special Committee on Electoral Reform, to which she was appointed by Order of the House on May 26, 2021. Kate White is Vice-Chair of the Standing Committee on Public Accounts. She was appointed to the committee by Order of the House on May 17, 2021. She was appointed a member of the Members’ Services Board by Order of the House on May 13, 2021.
During the 34th Legislative Assembly Kate White was a member of the Members' Services Board, the Standing Committee on Public Accounts, the Standing Committee on Statutory Instruments and the Standing Committee on Appointments to Major Government Boards and Committees. During the 33rd Legislative Assembly Kate White served on the Standing Committee on Appointments to Major Government Boards and Committees.
On May 10, 2021, it was announced that Kate White would be the New Democratic Party caucus critic for Finance and Executive Council Office, Education, Community Services, Energy, Mines and Resources, Economic Development, francophone issues, the Public Service Commission, and the Yukon Workers' Compensation Health and Safety Board.