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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|
| 2013 | Boise Hawks | 4.38 | .244 | NWL |
| 2014 | Beaverton Knights | 5.60 | .280 | NWL |
| 2015 | Everett Otters | 5.23 | .272 | NWL |
| 2016 | Boise Hawks | 4.77 | .263 | NWL |
| 2017 | Duluth Trackers | 4.71 | .264 | NWL |
| 2018 | Salt Lake City Sky Devils | 5.17 | .265 | NWL |
| 2019 | Bellingham Vipers | 5.12 | .275 | NWL |
| 2020 | Bismarck Bullets | 5.31 | .275 | NWL |
| 2021 | Beaverton Knights | 4.12 | .237 | NWL |
| 2022 | Salt Lake City Sky Devils | 3.79 | .228 | NWL |
| 2023 | Yakima Yaquis | 4.28 | .264 | NWL |
