Don was first elected to the legislature as the MLA for Indian Head-Milestone in 1999. He was re-elected in the 2003, 2007 and 2011 provincial elections. During his two terms in opposition, Don served as the critic for Health, K-12 Learning, and Labour. In government, Don serves as the Minister of Health.

Don McMorris was raised in the Indian-Head Milestone constituency. He graduated from Milestone High School and ran the driver education program for Prairie View School Division for many years. Don worked with the Saskatchewan Safety Council for ten years with responsibility for all traffic safety programs offered in the province. He also started a company called Crossroads Safety offering safety training courses to corporate clients.

Don enjoys snowboarding, hockey, curling, and spending time at the lake. Don and his wife Cindy operate a family farm in the Lewvan area. They have two sons.