2014 – Waldorf University joined the NSAA as an affiliate member for football in the 2014 fall season (2014–15 academic year).
2015 – Bellevue University and Viterbo University joined the NSAA (along with Waldorf upgrading to join for all sports) in the 2015–16 academic year.
2015 – The University of Winnipeg joined the NSAA as an affiliate member for baseball in the 2016 spring season (2015–16 academic year).
2017 – Winnipeg left the NSAA as an affiliate member for baseball as the school dropped the sport after the 2017 spring season (2016–17 academic year).
2021 – Iowa Wesleyan University joined the NSAA as an affiliate member for football, men's track and field, and women's track and field in the 2021–22 academic year.
2023 – Presentation (S.D.) left the NSAA as the school closed after the 2022–23 academic year.[3]
2023 – Iowa Wesleyan left the NSAA as an affiliate member as the school closed after the 2022–23 academic year.[4]
2024 – Waldorf left the NSAA to join the GPAC after the 2023–24 academic year.[5]
2024 – Jamestown rejoined the NSAA for the 2024–25 academic year.[7]
2025 – The NSAA will cease operations as an athletic conference after the 2024–25 academic year; as many schools left to join their respective new home primary conferences beginning the 2025–26 academic year:[2] Jamestown will transition to the NCAA Division II ranks and join the Northern Sun Intercollegiate Conference (NSIC), while the remaining five schools (Bellevue, Dakota State, Mayville State and Valley City State; with Dickinson State rejoining) will join the Frontier Conference.[8][9][10]
^Represents the calendar year when fall sports competition begins.
^ abcdeBellevue, Dakota State, Dickinson State, Mayville State, and Valley City State will join the Frontier Conference upon dissolution of the NSAA after the 2024–25 academic year.[9][10]
^Waldorf competed in the NSAA as an affiliate member for football only during the 2014 fall season (2014–15 school year); before becoming a full member, effective the 2015–16 school year.
^Dickinson State was a member of the Frontier Conference, which does not sponsor baseball, in 2014. The 2014 NSAA tournament, known that year as the NSAA/Frontier Tournament, included Dickinson State. Regular-season games against Dickinson State in 2014, are not counted as conference games and are excluded from the teams' regular-season records, since Dickinson State was not an NSAA member. However, 2014 conference tournament games involving Dickinson State are counted as tournament wins and losses, since Dickinson State was a tournament participant that year.
^Dickinson State dropped their baseball program after the 2017-18 season, and then reinstated it for the 2020-21 season.
^The 2020 season was cancelled due to the COVID-19 pandemic.
^Total does not include 2014 NSAA/Frontier Tournament Championship when they were a member of the Frontier Conference.
^Dickinson State and Great Falls were members of the Frontier Conference, which does not sponsor softball, in 2014. The NSAA tournament, known that year as the NSAA/Frontier Tournament, included Dickinson State and Great Falls. Regular-season games against those two clubs in 2014, are not counted as conference games and are excluded from the teams' regular-season records, since they were not NSAA members. However, 2014 conference tournament games involving either Dickinson State or Great Falls are included as tournament wins and losses, since both teams were tournament participants that year.
^Great Falls was never a member of the NSAA, but played in the 2014 NSAA/Frontier Tournament, since the Frontier does not sponsor softball. Their record in that tournament is included here.
^Dickinson State won the 2014 NSAA/Frontier Tournament as a member of the Frontier Conference. Dakota State finished the best out of all NSAA teams in the 2014 tournament as they finished third.
^The 2020 season was cancelled due to the COVID-19 pandemic.