| YEAR | CHAMPION | SITE |
| 1932 | Des Moines Old Pals | Fort Dodge |
| 1933 | Des Moines Old Pals | Des Moines |
| 1934 | Boone Patty Anne | Des Moines |
| 1935 | Boone Dairy | Sioux City |
| 1936 | Schukei Chevrolet | Boone/Waterloo |
| 1937 | Boone Nite Hawks | Des Moines |
| 1938 | Des Moines Iowa Pack | Des Moines |
| 1939 | Waterloo Shukei Motors | Des Moines |
| 1940 | Sioux City Sioux Toolers | Waterloo |
| 1941 | Des Moines Iowa Pack | Waterloo |
| 1942 | Des Moines Boyt Harness | Des Moines |
| 1943 | Fort Dodge Tobin Packing | Des Moines |
| 1944 | Clarinda P.O.W. Camp Guards | Des Moines |
| 1945 | Clarinda P.O.W. Camp Guards | Des Moines |
| 1946 | Waterloo John Deere | Cedar Rapids |
| 1947 | Des Moines Willkei House Vets | Des Moines |
| 1948 | Waterloo John Deere | Des Moines |
| 1949 | Sioux City Burnett Motors | Boone |
| 1950 | Cedar Rapids Danceland | Boone |
| 1951 | Des Moines Hot-N- Tots | Boone |
| 1952 | Sioux City Blue Bunny Ice Cream | Boone |
| 1953 | Cedar Rapids Whity's Auto | Boone |
| 1954 | Des Moines Glen towers Truckers | Boone |
| 1955 | Des Moines Glen towers Truckers | Boone |
| 1956 | Des Moines Nite Hawks | Boone |
| 1957 | Sioux City Harbeck's Footwear | Boone |
| 1958 | Boone Merchants | Boone |
| 1959 | Sioux City Investors | Boone |
| 1960 | Boone Merchants | Boone |
| 1961 | Cedar Rapids Fleck's Falstaff | Des Moines |
| 1962 | Cedar Rapids Fleck's Falstaff | Des Moines |
| 1963 | Des Moines Club Cavalier | Des Moines |
| 1964 | Sioux City Gibson's Appliance | Des Moines |
| 1965 | Cedar Rapids Fleck's Falstaff | Des Moines |
| 1966 | Des Moines Great Plains Bag | Des Moines |
| 1967 | Cedar Falls Larry Lange Ford | Des Moines |
| 1968 | Cedar Falls Larry Lange Ford | Des Moines |
| 1969 | Cedar Rapids Welty Way | Des Moines |
| 1970 | Cedar Rapids Welty Way | Des Moines |
| 1971 | Cedar Rapids Welty Way | Des Moines |
| 1972 | Clear Lake Butt'r Topp | Ames |
| 1973 | Des Moines Bombers | Des Moines |
| 1974 | Des Moines Bombers | Des Moines |
| 1975 | Clear Lake Butt'r Topp | Cedar Rapids |
| 1976 | Cedar Rapids Collins | Cedar Rapids |
| 1977 | Cedar Rapids Modern Piping | Des Moines |
| 1978 | Clear Lake Butt'r Topp | Des Moines |
| 1979 | Cedar Rapids Modern Piping Co/Champs with Des Moines Bombers | Cedar Rapids |
| 1979 | Des Moines BombersCo/Champs with Cedar Rapids Modern Piping | Cedar Rapids |
| 1980 | Clear Lake Butt'r Topp | Des Moines |
| 1981 | Clear Lake Butt'r Topp | Cedar Rapids |
| 1982 | Des Moines Coors Bombers | Cedar Rapids |
| 1983 | Clear Lake Butt'r Topp | Sioux City |
| 1984 | ||
| 1985 | Davenport Thoms Proestler | Cedar Rapids |
| 1986 | Sioux City Penn Corp. | Cedar Rapids |
| 1987 | Cedar Rapids Teleconnect | Cedar Rapids |
| 1988 | Des Moines LaPizza House/Henry J's | Cedar Rapids |
| 1989 | Sioux City Penn Corp. | Des Moines |
| 1990 | Des Moines Metros | Cedar Rapids |
| 1991 | Cedar Rapids Bosch - Rausch Financial Group | Cedar Rapids |
| 1992 | Sioux City Gateway 2000 Soos | Cedar Rapids |
| 1993 | Des Moines Metros | Cedar Rapids |
| 1994 | Sioux City Gateway 2000 Soos | Cedar Rapids |
| 1995 | Sioux City Gateway 2000 Soos | Cedar Rapids |
| 1996 | Mahoney's | Cedar Rapids |
| 1997 | Central Iowa Express | Marshalltown |
| 1998 | Central Iowa Express | Marshalltown |
| 1999 | Central Iowa Express | Marshalltown |
| 2000 | Class "A" - Albaugh Inc. | Elkhart |
| 2001 | Class "A" - DM Knights | Des Moines |
| 2002 | Class "A" - Albaugh Inc. | Elkhart |
| 2003 | Class "A" - Albaugh Inc. & Elkhart (Tied due to rain) | Elkhart |