| 1884 | Sisters of Charity, Dubuque, IA, opened a school in a room at St. Mary's Church. |
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| 1898 | Father Joseph Kelly built the first school at St. Mary's. |
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| 1907 | Sacred Heart School opened by Father Culemans and Sister Mary Catherine appointed the first superior. |
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| 1926 | New grade school and high school built at St. Mary's. |
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| 1949 | Alleman High School opens and St. Mary's High School becomes a grade school only. |
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| 1953 | Monsignor J.J. Levan dedicates the newly constructed Sacred Heart Catholic School at 16th Avenue and 14th Street. |
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| 1978 | Seton Catholic School System established with the merging of St. Mary's and Sacred Heart Schools. K-5th grades housed at Sacred Heart School, 6th - 8th at St. Mary's. |
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| 1996 | Feasibility study conducted to test for support of a new Seton Junior High building. |
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| 1997 | $3.65 million capital campaign initiated to build a New Seton Junior High School. |
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| 1998 | New Seton Middle School Completed and Opened. |
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