Softball Coaches
Jordan Petersen
Head Coach
Jenna Trefethren
Assistant Coach
Lizzy Hansen
Student Manager
Full List
Jenna Trefethren

Jenna Trefethren

Assistant Coach

Email [email protected]

Jenna Trefethren begins her first season in the Bemidji State dugout as an assisitant coach. She came to BSU after a two-year stint as a graduate assistant coach at her Alma Mater Northern State University.

In two seasons as an assistant at NSU, Trefethren was responsible for organization of individual and small group hitting instruction, coordination of academic study table, organizing team community service initiatives, travel arrangements, field maintenance, youth camp instruction, and she assisted in the recruiting process, in addition to in-game and practice coaching duties. She was a part of a coaching staff that led the Wolves to a program-best 10-0 start in 2020 before the season was cut short due to COVID-19. 

Trefethren also has an extensive background as a youth skills instructor and coach. This summer, she served as the softball director at Camp Lenox, a sports camp in Otis, Mass. There she supervised children age 7 to 16 and was responsible for daily softball instruction. She also has experience as a softball instructor at D-Bat Sioux Falls, where she gave hitting, pitching and fielding instruction to softball players of all ages and was part of a leadership team that orchestrated youth and team camps as well as serving as a group lessons instructor. In addition, Helgeson also spent time from 2016-18 as an assistant coach for the Sioux Falls Diamonds organization.

As a student-athlete, Trefethren was a member of the NSU softball team from 2015-19. Before her career was shortened due to injury in 2019, she started 107 games in the Wolves’ outfield. As a sophomore (2017), she led a 29-26-1 NSIC team, which advanced to the Northern Sun Intercollegiate Conference Tournament, in home runs (8), RBI (36), doubles (15), walks (25) and batting average (.364). She was also a three-time selection to the NSIC All-Academic Team.

Trefethren is a 2019 graduate of Northern State with a degree in human performance and fitness.  She recently completed her Master’s Degree in sports performance and leadership from NSU.