Lyle Stewart was born and raised near Pense, Saskatchewan where he continues to farm and ranch with his wife Linda and son Lee.
Lyle was one of the first members in the Saskatchewan Party and was elected to the Legislative Assembly as the MLA for Thunder Creek in 1999. He was re-elected in 2003, 2007, 2011, and 2016.
During his two terms in opposition, Lyle served as the interim leader of the party, as well as the critic for Agriculture, Economic Development, and Industry and Resources.
After the Saskatchewan Party formed government in 2007, Lyle served as the Minister for Enterprise and Innovation, chair of the legislature's Standing Committee on the Economy, a member of the caucus' policy committee on the economy, and the province's Treasury Board.
On May 25, 2012, Premier Brad Wall appointed Lyle as the Minister of Agriculture and Minister responsible for Saskatchewan Crop Insurance Corporation.
Lyle and his wife Linda have three grown children and six grandchildren.