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| 4/30/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Sprint Cars 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Bret Klabunde (305 Sprints - Winged) | 4th | - | - | 7th |
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| 5/14/2021 | I-80 Speedway - Greenwood, NE 05/14/2021 Event 360 Sprints - Winged, Stock Cars, B Modifieds, Dirt Late Models, Sport Compact | Results | | Bret Klabunde (360 Sprints - Winged) | 6th | - | - | 17th |
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| 5/21/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Sport Mods and Stocks Cars with draw/redraw for these classes 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Bret Klabunde (305 Sprints - Winged) | 3rd | - | - | 7th |
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| 5/28/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$600 to win Hobby Stock and $400 to win Sport Compact 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Bret Klabunde (305 Sprints - Winged) | 6th | - | - | 8th |
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| 6/4/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Modifieds 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Bret Klabunde (305 Sprints - Winged) | 5th | - | - | 10th |
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| 6/11/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Modified and Sprint Cars. Sponsored by Finishline 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Bret Klabunde (305 Sprints - Winged) | 2nd | - | - | 7th |
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| 6/18/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Stock Cars 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Bret Klabunde (305 Sprints - Winged) | 5th | - | - | 4th |
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| 6/25/2021 | Crawford County Speedway - Denison, IA $1,500 to win at Crawford County Speedway 305 Sprints - Winged, Dirt Super Late Models, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Bret Klabunde (305 Sprints - Winged) | 5th | - | - | 7th |
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| 7/16/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Sport Mods 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Bret Klabunde (305 Sprints - Winged) | DNS | - | - | DNS |
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| 7/23/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-Fair Night 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Bret Klabunde (305 Sprints - Winged) | 7th | - | - | 13th (DNF) |
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| 10/1/2021 | I-80 Speedway - Greenwood, NE I-80 Speedway Championship Weekend - EAST/WEST Dirt Super Late Models: SLMR Late Model Series 360 Sprints - Winged | Results | | Bret Klabunde (360 Sprints - Winged) | 8th | - | - | 15th |
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| 10/2/2021 | I-80 Speedway - Greenwood, NE I-80 Speedway Championship Weekend - EAST/WEST Dirt Super Late Models: SLMR Late Model Series 360 Sprints - Winged, Dirt Late Models | Results | | Bret Klabunde (360 Sprints - Winged) | 9th | - | - | 14th |
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| 10/7/2021 | US 36 Raceway - Osborn, MO IMCA Missouri Nationals Test 'n' Tune Night 305 Sprints - Winged, Stock Cars, A Modifieds, B Modifieds, Limited Sport Mod, Pure Stock | Results | | Bret Klabunde (305 Sprints - Winged) | - | - | - | - |
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| 10/8/2021 | US 36 Raceway - Osborn, MO IMCA Missouri Nationals 305 Sprints - Winged, Stock Cars, A Modifieds, B Modifieds, Limited Sport Mod, Pure Stock | Results | | Bret Klabunde (305 Sprints - Winged) | 4th | - | - | 11th |
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| 10/9/2021 | US 36 Raceway - Osborn, MO IMCA Missouri Nationals 305 Sprints - Winged, Stock Cars, A Modifieds, B Modifieds, Limited Sport Mod, Pure Stock | Results | | Bret Klabunde (305 Sprints - Winged) | - | - | - | 12th |
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