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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|
| 2015 | Eugene Emeralds | 4.13 | .261 | A+ West |
| 2016 | Spokane Indians | 4.78 | .273 | A+ West |
| 2017 | Spokane Indians | 4.56 | .263 | A+ West |
| 2018 | Eugene Emeralds | 4.61 | .261 | A+ West |
| 2019 | Everett AquaSox | 4.28 | .244 | A+ West |
| 2020 | Everett AquaSox | 4.95 | .261 | A+ West |
| 2021 | Eugene Emeralds | 5.05 | .261 | A+ West |
| 2022 | Eugene Emeralds | 5.05 | .253 | A+ West |
| 2023 | Eugene Emeralds | 4.61 | .244 | A+ West |
| 2024 | Hillsboro Hops | 4.56 | .241 | A+ West |
| 2025 | Salem-Keizer Volcanoes | 5.33 | .269 | A+ West |
| 2026 | Salem-Keizer Volcanoes | 4.98 | .261 | A+ West |
| 2027 | Hillsboro Hops | 5.23 | .260 | A+ West |
| 2028 | Salem-Keizer Volcanoes | 5.89 | .273 | A+ West |
| 2029 | Boise Hawks | 5.62 | .269 | A+ West |
| 2030 | Spokane Indians | 5.36 | .259 | A+ West |
| 2031 | Vancouver Canadians | 4.87 | .253 | A+ West |
| 2032 | Hillsboro Hops | 4.59 | .243 | A+ West |
| 2033 | Vancouver Canadians | 4.87 | .246 | A+ West |
| 2034 | Eugene Emeralds | 5.64 | .261 | A+ West |
| 2035 | Tri-City Dust Devils | 5.92 | .264 | A+ West |
