Helena High School is a public high school for grades 9 through 12 located in Helena , Montana . It is part of the Helena Public School District . Founded in September 1876 , it is the oldest high school in the state of Montana . A new building was completed in August 1935 and it was almost destroyed a few months later in the 1935 Helena earthquake . In 1955 , the building became Helena Junior High School ( now Helena Middle School ) and Helena High School moved into its present location at 1300 Billings Avenue , just off Montana Avenue
1935 Helena earthquake
1935 Helena earthquake
Helena High School