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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|
| 2012 | Boise Hawks | 5.06 | .259 | NWL |
| 2013 | Boise Hawks | 4.19 | .235 | NWL |
| 2014 | Yakima Bears | 4.16 | .235 | NWL |
| 2015 | Tri-City Dust Devils | 3.88 | .241 | NWL |
| 2016 | Vancouver Canadians | 2.37 | .228 | NWL |
| 2017 | Vancouver Canadians | 3.50 | .244 | NWL |
| 2018 | Eugene Emeralds | 3.27 | .260 | NWL |
| 2019 | Boise Hawks | 4.09 | .267 | NWL |
| 2020 | Tri-City Dust Devils | 4.42 | .268 | NWL |
| 2021 | Tri-City Dust Devils | 4.06 | .255 | NWL |
| 2022 | Spokane Indians | 3.97 | .253 | NWL |
