| May 21, 1950 | Clay County Fairgrounds, Spencer, IA | IMCA Stock Car | Herschel Buchanan | |
| May 20, 1951 | Clay County Fairgrounds, Spencer, IA | IMCA Stock Car | Chug Montgomery | |
| September 14, 1951 | Clay County Fairgrounds, Spencer, IA | IMCA Stock Car | Eddie Anderson | |
| September 12, 1952 | Clay County Fairgrounds, Spencer, IA | IMCA Stock Car | Dominick Perlick | |
| September 18, 1953 | Clay County Fairgrounds, Spencer, IA | IMCA Stock Car | Ernie Derr | |
| September 17, 1954 | Clay County Fairgrounds, Spencer, IA | IMCA Stock Car | Don White | |
| September 18, 1954 | Clay County Fairgrounds, Spencer, IA | IMCA Stock Car | Don White | |
| September 16, 1955 | Clay County Fairgrounds, Spencer, IA | IMCA Stock Car | Johnny Beauchamp | |
| May 27, 1956 | Clay County Fairgrounds, Spencer, IA | IMCA Stock Car | Don White | |
| September 11, 1956 | Clay County Fairgrounds, Spencer, IA | IMCA Sprint Car | Don Hutchinson | |
| September 14, 1956 | Clay County Fairgrounds, Spencer, IA | IMCA Stock Car | Johnny Beauchamp | |
| September 15, 1956 | Clay County Fairgrounds, Spencer, IA | IMCA Sprint Car | Don Hutchinson | |
| September 10, 1957 | Clay County Fairgrounds, Spencer, IA | IMCA Sprint Car | Bobby Grim | |
| September 13, 1957 | Clay County Fairgrounds, Spencer, IA | IMCA Stock Car | Ernie Derr | |
| September 14, 1957 | Clay County Fairgrounds, Spencer, IA | IMCA Sprint Car | Bobby Grim | |
| September 9, 1958 | Clay County Fairgrounds, Spencer, IA | IMCA Sprint Car | Bobby Grim | |
| September 15, 1959 | Clay County Fairgrounds, Spencer, IA | IMCA Sprint Car | Jim Hurtubise | |
| September 14, 1960 | Clay County Fairgrounds, Spencer, IA | IMCA Sprint Car | Pete Folse | |
| September 12, 2007 | Clay County Fairgrounds, Spencer, IA | World of Outlaws Sprint Car | Donny Schatz | |
| September 10, 2008 | Clay County Fairgrounds, Spencer, IA | World of Outlaws Sprint Car | Donny Schatz | |
| September 16, 2009 | Clay County Fairgrounds, Spencer, IA | World of Outlaws Sprint Car | Jason Meyers | |
| September 17, 2010 | Clay County Fairgrounds, Spencer, IA | World of Outlaws Sprint Car | Jac Haudenschild | |
| September 16, 2011 | Arnold Motor Supply Shootout | Clay County Fairgrounds, Spencer, IA | World of Outlaws Sprint Car | Craig Dollansky |
| June 8, 2012 | Clay County Fairgrounds, Spencer, IA | World of Outlaws Sprint Car | Brad Sweet | |
| September 14, 2012 | 6th Arnold Motor Supply Shootout | Clay County Fairgrounds, Spencer, IA | World of Outlaws Sprint Car | Donny Schatz |
| September 13, 2013 | Clay County Fairgrounds, Spencer, IA | World of Outlaws Sprint Car | Donny Schatz | |
| September 12, 2014 | Clay County Fairgrounds, Spencer, IA | World of Outlaws Sprint Car | Kraig Kinser | |
| September 16, 2016 | Clay County Fairgrounds, Spencer, IA | World of Outlaws Sprint Car/NSL Sprint Car | Donny Schatz |