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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|
| 2019 | Hillsboro Hops | 3.82 | .254 | NWL |
| 2020 | Tri-City Dust Devils | 5.00 | .271 | NWL |
| 2021 | Everett AquaSox | 4.44 | .254 | NWL |
| 2022 | Spokane Indians | 4.14 | .252 | NWL |
| 2023 | Salem-Keizer Volcanoes | 4.54 | .261 | NWL |
| 2024 | Everett AquaSox | 5.33 | .254 | NWL |
| 2025 | Tri-City Dust Devils | 6.26 | .281 | NWL |
| 2026 | Eugene Emeralds | 4.90 | .249 | NWL |
| 2027 | Eugene Emeralds | 5.57 | .267 | NWL |
| 2028 | Hillsboro Hops | 5.39 | .258 | NWL |
| 2029 | Eugene Emeralds | 4.35 | .227 | NWL |
| 2030 | Tri-City Dust Devils | 6.14 | .286 | NWL |
| 2031 | Salem-Keizer Volcanoes | 5.45 | .267 | NWL |
| 2032 | Vancouver Canadians | 3.59 | .250 | NWL |
| 2033 | Vancouver Canadians | 4.02 | .257 | NWL |
| 2034 | Salem-Keizer Volcanoes | 3.60 | .237 | NWL |
| 2035 | Eugene Emeralds | 4.69 | .242 | NWL |
| 2036 | Hillsboro Hops | 4.58 | .242 | NWL |
| 2037 | Hillsboro Hops | 3.82 | .230 | NWL |
| 2038 | Tri-City Dust Devils | 4.78 | .258 | NWL |
| 2039 | Tri-City Dust Devils | 4.65 | .255 | NWL |
| 2040 | Vancouver Canadians | 4.74 | .254 | NWL |
| 2041 | Tri-City Dust Devils | 5.00 | .259 | NWL |
