| 2020 | 8 | 1 | | Billings Mustangs,Grand Junction Rockies,Great Falls Voyagers,Idaho Falls Chukars,Missoula PaddleHeads,Ogden Raptors,Orem Owlz,Rocky Mountain Vibes |
| 2019 | 8 | 2 | Idaho Falls Chukars | Billings Mustangs,Grand Junction Rockies,Great Falls Voyagers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz,Rocky Mountain Vibes |
| 2018 | 8 | 2 | Great Falls Voyagers | Billings Mustangs,Grand Junction Rockies,Great Falls Voyagers,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2017 | 8 | 2 | Ogden Raptors | Billings Mustangs,Grand Junction Rockies,Great Falls Voyagers,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2016 | 8 | 2 | Orem Owlz | Billings Mustangs,Grand Junction Rockies,Great Falls Voyagers,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2015 | 8 | 2 | Missoula Osprey | Billings Mustangs,Grand Junction Rockies,Great Falls Voyagers,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2014 | 8 | 2 | Billings Mustangs | Billings Mustangs,Grand Junction Rockies,Great Falls Voyagers,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2013 | 8 | 2 | Idaho Falls Chukars | Billings Mustangs,Grand Junction Rockies,Great Falls Voyagers,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2012 | 8 | 2 | Missoula Osprey | Billings Mustangs,Grand Junction Rockies,Great Falls Voyagers,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2011 | 8 | 2 | Great Falls Voyagers | Billings Mustangs,Casper Ghosts,Great Falls Voyagers,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2010 | 8 | 2 | Helena Brewers | Billings Mustangs,Casper Ghosts,Great Falls Voyagers,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2009 | 8 | 2 | Orem Owlz | Billings Mustangs,Casper Ghosts,Great Falls Voyagers,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2008 | 8 | 2 | Great Falls Voyagers | Billings Mustangs,Casper Ghosts,Great Falls Voyagers,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2007 | 8 | 2 | Orem Owlz | Billings Mustangs,Casper Ghosts,Great Falls White Sox,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2006 | 8 | 2 | Missoula Osprey | Billings Mustangs,Casper Rockies,Great Falls White Sox,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2005 | 8 | 2 | Orem Owlz | Billings Mustangs,Casper Rockies,Great Falls White Sox,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Orem Owlz |
| 2004 | 8 | 2 | Provo Angels | Billings Mustangs,Casper Rockies,Great Falls White Sox,Helena Brewers,Idaho Falls Chukars,Missoula Osprey,Ogden Raptors,Provo Angels |
| 2003 | 8 | 2 | Billings Mustangs | Billings Mustangs,Casper Rockies,Great Falls White Sox,Helena Brewers,Idaho Falls Padres,Missoula Osprey,Ogden Raptors,Provo Angels |
| 2002 | 8 | 2 | Great Falls Dodgers | Billings Mustangs,Casper Rockies,Great Falls Dodgers,Idaho Falls Padres,Medicine Hat Blue Jays,Missoula Osprey,Ogden Raptors,Provo Angels |
| 2001 | 8 | 2 | Billings Mustangs | Billings Mustangs,Casper Rockies,Great Falls Dodgers,Idaho Falls Padres,Medicine Hat Blue Jays,Missoula Osprey,Ogden Raptors,Provo Angels |
| 2000 | 8 | 2 | Idaho Falls Padres | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Raptors,Idaho Falls Padres,Medicine Hat Blue Jays,Missoula Osprey,Ogden Raptors |
| 1999 | 8 | 2 | Missoula Osprey | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Brewers,Idaho Falls Braves,Medicine Hat Blue Jays,Missoula Osprey,Ogden Raptors |
| 1998 | 8 | 2 | Idaho Falls Braves | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Brewers,Idaho Falls Braves,Lethbridge Black Diamonds,Medicine Hat Blue Jays,Ogden Raptors |
| 1997 | 8 | 1 | Billings Mustangs | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Brewers,Idaho Falls Braves,Lethbridge Black Diamonds,Medicine Hat Blue Jays,Ogden Raptors |
| 1996 | 8 | 2 | Helena Brewers | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Brewers,Idaho Falls Braves,Lethbridge Black Diamonds,Medicine Hat Blue Jays,Ogden Raptors |
| 1995 | 8 | 2 | Helena Brewers | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Brewers,Idaho Falls Braves,Lethbridge Mounties,Medicine Hat Blue Jays,Ogden Raptors |
| 1994 | 8 | 2 | Billings Mustangs | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Brewers,Idaho Falls Braves,Lethbridge Mounties,Medicine Hat Blue Jays,Ogden Raptors |
| 1993 | 8 | 2 | Billings Mustangs | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Brewers,Idaho Falls Braves,Lethbridge Mounties,Medicine Hat Blue Jays,Pocatello Posse |
| 1992 | 8 | 2 | Billings Mustangs | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Brewers,Idaho Falls Gems,Lethbridge Mounties,Medicine Hat Blue Jays,Salt Lake City Trappers |
| 1991 | 8 | 2 | Salt Lake City Trappers | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Brewers,Idaho Falls Braves,Medicine Hat Blue Jays,Pocatello Pioneers,Salt Lake City Trappers |
| 1990 | 8 | 2 | Great Falls Dodgers | Billings Mustangs,Butte Copper Kings,Gate City Pioneers,Great Falls Dodgers,Helena Brewers,Idaho Falls Braves,Medicine Hat Blue Jays,Salt Lake City Trappers |
| 1989 | 8 | 2 | Great Falls Dodgers | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Brewers,Idaho Falls Braves,Medicine Hat Blue Jays,Pocatello Giants,Salt Lake City Trappers |
| 1988 | 8 | 2 | Great Falls Dodgers | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Brewers,Idaho Falls Braves,Medicine Hat Blue Jays,Pocatello Giants,Salt Lake City Trappers |
| 1987 | 8 | 2 | Salt Lake City Trappers | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Brewers,Idaho Falls Braves,Medicine Hat Blue Jays,Pocatello Giants,Salt Lake City Trappers |
| 1986 | 6 | 1 | Salt Lake City Trappers | Billings Mustangs,Great Falls Dodgers,Helena Gold Sox,Idaho Falls Braves,Medicine Hat Blue Jays,Salt Lake City Trappers |
| 1985 | 8 | 2 | Salt Lake City Trappers | Billings Mustangs,Butte Copper Kings,Great Falls Dodgers,Helena Gold Sox,Idaho Falls Nuggets,Medicine Hat Blue Jays,Pocatello Gems,Salt Lake City Trappers |
| 1984 | 8 | 2 | Helena Gold Sox | Billings Mustangs,Butte Copper Kings,Calgary Expos,Great Falls Dodgers,Helena Gold Sox,Idaho Falls A's,Medicine Hat Blue Jays,Pocatello Gems |
| 1983 | 8 | 2 | Billings Mustangs | Billings Mustangs,Butte Copper Kings,Calgary Expos,Great Falls Giants,Helena Phillies,Idaho Falls A's,Lethbridge Dodgers,Medicine Hat Blue Jays |
| 1982 | 8 | 2 | Medicine Hat Blue Jays | Billings Mustangs,Butte Copper Kings,Calgary Expos,Great Falls Giants,Helena Phillies,Idaho Falls A's,Lethbridge Dodgers,Medicine Hat Blue Jays |
| 1981 | 8 | 2 | Butte Copper Kings | Billings Mustangs,Butte Copper Kings,Calgary Expos,Great Falls Giants,Helena Phillies,Idaho Falls Angels,Lethbridge Dodgers,Medicine Hat Blue Jays |
| 1980 | 8 | 2 | Lethbridge Dodgers | Billings Mustangs,Butte Copper Kings,Calgary Expos,Great Falls Giants,Helena Phillies,Idaho Falls Angels,Lethbridge Dodgers,Medicine Hat Blue Jays |
| 1979 | 8 | 2 | Lethbridge Dodgers | Billings Mustangs,Butte Copper Kings,Calgary Expos,Great Falls Giants,Helena Phillies,Idaho Falls Angels,Lethbridge Dodgers,Medicine Hat Blue Jays |
| 1978 | 8 | 1 | Billings Mustangs | Billings Mustangs,Butte Copper Kings,Calgary Cardinals,Great Falls Giants,Helena Phillies,Idaho Falls Angels,Lethbridge Dodgers,Medicine Hat Blue Jays |
| 1977 | 6 | 1 | | Billings Mustangs,Calgary Cardinals,Great Falls Giants,Idaho Falls Angels,Lethbridge Dodgers,Medicine Hat A's |
| 44 record(s) |