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| 5/1/2021 | 141 Speedway - Maribel, WI Salute to Armed Forces / 141 Championship Cup Race #3 Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Jonathan Miller (IMCA Stock Car) | 9th | - | 7th | - |
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| 5/8/2021 | 141 Speedway - Maribel, WI Mother's Day / "Red" Race $1,000.00 to Win Red IMCA Modified / 141 Championship Cup Race #4 Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Jonathan Miller (IMCA Stock Car) | 7th | - | 10th | - |
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| 5/22/2021 | 141 Speedway - Maribel, WI 141 Championship Cup Race #6 Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Jonathan Miller (IMCA Stock Car) | 5th | - | 8th | - |
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| 5/29/2021 | 141 Speedway - Maribel, WI Nathan Bouche Memorial / $1,000.00 to Win Stock Cars Triple Creek Series / 141 Championship Cup #7 Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Jonathan Miller (IMCA Stock Car) | 5th | - | 6th | - |
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| 6/5/2021 | 141 Speedway - Maribel, WI Bank First Coin Drop / 141 Championship Cup Race #8 Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Jonathan Miller (IMCA Stock Car) | 7th | - | 5th | - |
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| 7/3/2021 | Lincoln Park Speedway - Putnamville, IN Bill Gardner Sprintacular Night 2 with MSCS/USAC Sprints Midgets: USAC National Midgets 410 Sprints - Non-Winged: Midwest Sprint Car Series MSCS Lightning Sprints: Midwest Mini Sprint Association | Results | | Jonathan Miller (Midgets) | 6th | - | - | 14th |
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| 9/24/2021 | 141 Speedway - Maribel, WI 12th Annual Treek Strong Creek Classic / "Blue" Race $1,000.00 to Win IMCA Modifieds Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Jonathan Miller (IMCA Stock Car) | 10th | - | 4th | - |
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| 9/25/2021 | 141 Speedway - Maribel, WI 12th Annual Treek Strong Creek Classic Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Jonathan Miller (IMCA Stock Car) | 7th | - | 3rd | 20th |
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