Mia Trejo

Biography

Mia Trejo finished her first season as an assistant coach for Southern Illinois in 2026. Jen Sewell announced the hiring of Trejo as an assistant on July 26, 2025. In Trejo's first year as an assistant, SIU went 34-17 overall and 21-6 in MVC play. Offensively, the Salukis scored 276 runs which ranked second in the Valley. "Thrilled to have Mia on staff with us this year working with our defense and our offense," Sewell said. "Our goal was to bring in a player's coach who believes in our culture and has a championship background. Thanks to our administration, we have the resources to recruit a big time coach and recruiter like Mia into our program." Trejo comes to SIU by way of Utah State, where she worked as an assistant for two seasons. Under Trejo, the Aggies set new program single-season records in 2025 in home runs (66), batting average (.345), slugging percentage (.557), and on-base percentage (.428). Other records that were set in the spring include runs (340), RBI (319), and total bases (807). Utah State also had seven all-conference players in 2025, the most in program history. In her first season at Utah State, Trejo and the Aggies achieved their best 24-game start since 2017 when they began the year 15-9. In non-conference play, the team went 17-11, one of the best marks in the recent history of the program. Prior to Utah State, Trejo had previously spent time at her alma mater, the University of Nevada Las Vegas (UNLV), as a graduate assistant in 2023. Trejo played