On July 26, 1959, sixty-four people gathered in a dance studio to celebrate the first Lutheran worship in Simi Valley.  On that same day, a Sunday school was conducted with 16 children in attendance.

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The Pacific Southwest District’s Mission Board of the Lutheran Church- Missouri Synod appointed the first Pastor; Reverend Edward Halverson. Pastor Halverson along with six families, formerly the Canoga Park Lutheran Church, organized the new congregation.

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In October of the same year, the Mission Board helped the young congregation purchase five acres of a lemon grove at the corner of Alamo and Reservoir Streets in Simi Valley.

Groundbreaking ceremonies were held on July 23, 1961.  Volunteers donated their time and efforts completing the chapel–parish hall.  The first educational wing was completed in 1964.  In 1973, the Fireside Room was completed and the Biblical Garden was dedicated.  A new parking lot was completed in 1986, and new landscaping was completed.  The Northridge Earthquake of 1994 proved to the congregation that our facilities were well constructed.  The facility survived with the only damage being a broken baptismal basin.  However, it was an opportunity to continue refurbishing the sanctuary that was highlighted with the construction of the Altar Window.  In 2007, construction began on a new preschool building to the east of the complex.  The preschool addition and new Youth Room was completed in 2010.

Trinity has been served by eight pastors: Rev. Edward Halverson; Rev. Ed W. Blumenkamp; Rev. Ralph Busch; Rev. Edmond E. Aho; Rev. Al Young; Rev. Cliff Kenyon; Rev. David R. Brinkley.

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In 2012 the congregation voted to call our Director of Youth, Robert Barker, as our new pastor.  Rev. Barker was ordained and installed as Trinity’s 8th pastor on 20 June 2015.

Good Shepherd Lutheran School was originally founded by three Lutheran congregations in 1979.  In the Fall of 2016, GSLS became the sole ministry of Trinity.  The school offers grades kindergarten through the fifth grade.