| YEAR | W-L REG. SEASON | W-L PLAYOFFS | POINTS SCORED | PLAYOFF OPPONENT | STATE PLACE |
| 1974 | 9-0 | 0-1 | 282-49 | Atlantic | - |
| 1975 | 9-0 | 2-1 | 409-154 | Dennison, Linn Mar, Urbandale | Runner-up |
| 1976 | 8-1 | 2-1 | 369-90 | Garrigan, Atlantic, Waterloo Columbus | Runner-up |
| 1977 | 7-1 | 3-0 | 304-74 | Humboldt, Monticello, Audubon | Champions |
| 1978 | 8-0 | 2-1 | 274-119 | FD St. Eds, Harlan, CR Regis | Runner-up |
| 1979 | 8-0 | 3-0 | 392-68 | Osage, Marion, Urbandale | Champions |
| 1980 | 8-0 | 1-1 | 337-54 | Garrigan, Atlantic | - |
| 1981 | 8-0 | 1-1 | 224-47 | Clear Lake, Harlan | - |
| 1982 | 5-3 | - | 177-95 | - | - |
| 1983 | 8-0 | 2-1 | 351-69 | Sheldon, Griswold, CR LaSalle | Runner-up |
| 1984* | 8-0 | 3-1 | 293-84 | Sheldon, Maple Valley, Shenandoah, Grundy Center | Runner-up |
| 1985* | 8-0 | 0-1 | 277-51 | Garrigan | - |
| 1986 | 8-0 | 0-1 | 228-79 | Garrigan | - |
| 1987 | 6-2 | 3-1 | 280-130 | Garrigan, Sgt. Bluffs, Shenandoah, Wapsie Valley | Runner-up |
| 1988 | 7-1 | 3-1 | 329-95 | Manson, C. Lyon, Griswold, Solon | Runner-up |
| 1989 | 7-1 | 4-0 | 403-98 | S. OBrien, W. Lyon, Audubon, Mt Vernon | Champions |
| 1990 | 7-1 | 4-0 | 344-152 | W. Lyon, N. Iowa, Clarinda, Wapsie Valley | Champions |
| 1991 | 7-1 | 1-1 | 377-108 | Kingsley-Pierson, C. Lyon | - |
| 1992 | 9-0 | 1-1 | 250-95 | Laurens NW, W. Lyon | - |
| 1993 | 8-1 | 0-1 | 263-75 | W. Hancock | - |
| 1994 | 8-1 | 2-1 | 357-136 | W. Lyon, W. Hancock, Iowa Falls | - |
| 1995 | 6-3 | 0-1 | 242-138 | Laurens NW | - |
| 1996 | 9-0 | 2-1 | | | - |
| 1997 | 9-0 | 4-0 | | | Champions |
| 1998 | 9-0 | 0-1 | 382-147 | West Lyon | - |
| 1999 | 9-0 | 0-1 | 348-103 | West Lyon | - |
| 2000 | 8-1 | 4-0 | 448-75 | Rock Valley-Central Lyon, Britt-West Hancock, West Union-North Fayette, Solon | Champions |