# List of Pioneer League champions

The Pioneer League is an independent baseball league in the United States. From 1939 to 2020, it was part of affiliated Minor League Baseball. A league champion is determined at the end of each season. Champions have been determined by postseason playoffs or winning the regular season pennant. Currently, the first- and second-half winners within each division, North and South, meet in a best-of-three series to determine division champions. Then, the North and South division winners play a best-of-three series to determine a league champion.

## League champions

    Series and finalist information is only presented when postseason play occurred; the lack of this information indicates a declared league champion.
| Year | Champion | Series | Finalist |
| 1939 | Twin Falls Cowboys | — | No playoffs held |
| 1940 | Ogden Reds | 3–0 | Boise Pilots |
| 1941 | Ogden Reds | 3–1 | Boise Pilots |
| 1942 | Pocatello Cardinals | 4–3 | Boise Pilots |
| 1943 | Not in operation |
| 1944 | Not in operation |
| 1945 | Not in operation |
| 1946 | Salt Lake City Bees | 4–2 | Twin Falls Cowboys |
| 1947 | Twin Falls Cowboys | 4–1 | Salt Lake City Bees |
| 1948 | Twin Falls Cowboys | 4–2 | Pocatello Cardinals |
| 1949 | Pocatello Cardinals | 3–2 | Billings Mustangs |
| 1950 | Billings Mustangs | 3–0 | Twin Falls Cowboys |
| 1951 | Great Falls Electrics | 3–2 | Twin Falls Cowboys |
| 1952 | Idaho Falls Russets | 3–0 | Pocatello Bannocks |
| 1953 | Salt Lake City Bees | 3–0 | Great Falls Electrics |
| 1954 | Great Falls Electrics | 3–2 | Salt Lake City Bees |
| 1955 | Magic Valley Cowboys | 3–2 | Pocatello Bannocks |
| 1956 | Boise Braves | — | No playoffs held |
| 1957 | Billings Mustangs | 3–2 | Salt Lake City Bees |
| 1958 | Boise Braves | 3–2 | Great Falls Electrics |
| 1959 | Billings Mustangs | 3–1 | Idaho Falls Russets |
| 1960 | Boise Braves | 3–0 | Idaho Falls Russets |
| 1961 | Great Falls Electrics | 3–1 | Boise Braves |
| 1962 | Billings Mustangs | 3–0 | Boise Braves |
| 1963 | Idaho Falls Yankees | 2–1 | Billings Mustangs |
| 1964 | Treasure Valley Cubs | — | No playoffs held |
| 1965 | Treasure Valley Cubs | — | No playoffs held |
| 1966 | Ogden Dodgers | — | No playoffs held |
| 1967 | Ogden Dodgers | — | No playoffs held |
| 1968 | Ogden Dodgers | — | No playoffs held |
| 1969 | Ogden Dodgers | — | No playoffs held |
| 1970 | Idaho Falls Angels | — | No playoffs held |
| 1971 | Great Falls Giants | — | No playoffs held |
| 1972 | Billings Mustangs | — | No playoffs held |
| 1973 | Billings Mustangs | — | No playoffs held |
| 1974 | Idaho Falls Angels | — | No playoffs held |
| 1975 | Great Falls Giants | — | No playoffs held |
| 1976 | Great Falls Giants | — | No playoffs held |
| 1977 | Lethbridge Dodgers | — | No playoffs held |
| 1978 | Billings Mustangs | 2–0 | Idaho Falls Angels |
| 1979 | Lethbridge Dodgers | 2–0 | Helena Brewers |
| 1980 | Lethbridge Dodgers | 2–1 | Billings Mustangs |
| 1981 | Butte Copper Kings | 3–2 | Calgary Expos |
| 1982 | Medicine Hat Blue Jays | 3–1 | Idaho Falls A's |
| 1983 | Billings Mustangs | 3–1 | Calgary Expos |
| 1984 | Helena Gold Sox | 3–1 | Billings Mustangs |
| 1985 | Salt Lake City Trappers | 3–2 | Great Falls Dodgers |
| 1986 | Salt Lake City Trappers | 3–1 | Great Falls Dodgers |
| 1987 | Salt Lake City Trappers | 3–1 | Helena Brewers |
| 1988 | Great Falls Dodgers | 3–2 | Butte Copper Kings |
| 1989 | Great Falls Dodgers | 3–0 | Butte Copper Kings |
| 1990 | Great Falls Dodgers | 3–0 | Salt Lake City Trappers |
| 1991 | Salt Lake City Trappers | 2–1 | Great Falls Dodgers |
| 1992 | Billings Mustangs | 2–0 | Salt Lake City Trappers |
| 1993 | Billings Mustangs | 2–1 | Helena Brewers |
| 1994 | Billings Mustangs | 3–2 | Helena Brewers |
| 1995 | Helena Brewers | 2–0 | Medicine Hat Blue Jays |
| 1996 | Helena Brewers | 2–0 | Ogden Raptors |
| 1997 | Billings Mustangs | 2–0 | Great Falls Dodgers |
| 1998 | Idaho Falls Braves | 2–1 | Lethbridge Black Diamonds |
| 1999 | Missoula Osprey | 2–0 | Billings Mustangs |
| 2000 | Idaho Falls Padres | 2–0 | Great Falls Dodgers |
| 2001 | Billings Mustangs | 2–0 | Provo Angels |
| 2002 | Great Falls Dodgers | 2–1 | Provo Angels |
| 2003 | Billings Mustangs | 2–0 | Provo Angels |
| 2004 | Provo Angels | 2–0 | Billings Mustangs |
| 2005 | Orem Owlz | 2–0 | Helena Brewers |
| 2006 | Missoula Osprey | 2–0 | Idaho Falls Chukars |
| 2007 | Orem Owlz | 2–0 | Great Falls White Sox |
| 2008 | Great Falls Voyagers | 2–1 | Orem Owlz |
| 2009 | Orem Owlz | 2–1 | Missoula Osprey |
| 2010 | Helena Brewers | 2–0 | Ogden Raptors |
| 2011 | Great Falls Voyagers | 2–0 | Ogden Raptors |
| 2012 | Missoula Osprey | 2–1 | Ogden Raptors |
| 2013 | Idaho Falls Chukars | 2–1 | Helena Brewers |
| 2014 | Billings Mustangs | 2–0 | Orem Owlz |
| 2015 | Missoula Osprey | 2–1 | Idaho Falls Chukars |
| 2016 | Orem Owlz | 2–0 | Billings Mustangs |
| 2017 | Ogden Raptors | 2–1 | Great Falls Voyagers |
| 2018 | Great Falls Voyagers | 2–0 | Grand Junction Rockies |
| 2019 | Idaho Falls Chukars | 2–1 | Ogden Raptors |
| 2020 | None (season cancelled due to COVID-19 pandemic) | None (season cancelled due to COVID-19 pandemic) | None (season cancelled due to COVID-19 pandemic) |
| 2021 | Missoula PaddleHeads | 2–1 | Boise Hawks |
| 2022 | Grand Junction Rockies | 2–0 | Missoula PaddleHeads |
| 2023 | Ogden Raptors | 2–0 | Billings Mustangs |
| 2024 | Yolo High Wheelers | 3–1 | Glacier Range Riders |

## Championship wins by team

Active Pioneer League teams appear in bold.
| Wins | Team | Championship years |
| 15 | Billings Mustangs | 1950, 1957, 1959, 1962, 1972, 1973, 1978, 1983, 1992, 1993, 1994, 1997, 2001, 2003, 2014 |
| 12 | Great Falls Electrics/Giants/Dodgers/Voyagers | 1951, 1954, 1961, 1971, 1975, 1976, 1988, 1989, 1990, 2002, 2008, 2011, 2018 |
| 8 | Idaho Falls Russets/Yankees/Angels/Braves/Padres/Chukars | 1952, 1963, 1970, 1974, 1998, 2000, 2013, 2019 |
| 5 | Missoula Osprey/PaddleHeads | 1999, 2006, 2012, 2015, 2021 |
| 4 | Helena Gold Sox/Brewers | 1984, 1995, 1996, 2010 |
| 4 | Ogden Dodgers | 1966, 1967, 1968, 1969 |
| 4 | Orem Owlz | 2005, 2007, 2009, 2016 |
| 4 | Salt Lake City Trappers | 1985, 1986, 1987, 1991 |
| 3 | Boise Braves | 1956, 1958, 1960 |
| 3 | Lethbridge Dodgers | 1977, 1979, 1980 |
| 3 | Twin Falls Cowboys | 1939, 1947, 1948 |
| 2 | Ogden Raptors | 2017, 2023 |
| 2 | Ogden Reds | 1940, 1941 |
| 2 | Pocatello Cardinals | 1942, 1949 |
| 2 | Salt Lake City Bees | 1946, 1953 |
| 2 | Treasure Valley Cubs | 1964, 1965 |
| 1 | Butte Copper Kings | 1981 |
| 1 | Grand Junction Rockies | 2022 |
| 1 | Magic Valley Cowboys | 1955 |
| 1 | Medicine Hat Blue Jays | 1982 |
| 1 | Provo Angels | 2004 |
| 1 | Yuba-Sutter High Wheelers | 2024 |