CARBONDALE, Ill. – Southern Illinois University softball head coach Jen Sewell has announced the hiring of Mia Trejo as an assistant coach.
“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 at UNLV from 2017 to 2022, where she was the program’s all-time career RBI leader and was a two-time All-Mountain West First Team and two-time All-Mountain West Second Team member.
At UNLV, Trejo was one of two players to earn Mountain West honors across all five seasons with the program.
“It’s not always easy for a player and coach of Mia’s caliber to share their skillset with athletes and develop them on and off the field, but she knows how to coach and build relationships with all types of athletes,” Sewell said. “I’m just excited to watch her get to work this fall. Her resume is deep and she’s ready to get to work. Every program she has touched has benefited greatly by her talents.”
Trejo earned a Bachelor of Science degree in human services from UNLV in 2022.
