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| 3/19/2021 | Beatrice Speedway - Beatrice, NE 28th Annual Beatrice Spring Nationals - Show #1 Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Sport Compact, IMCA Modified | Results | | Jim Mathieson (A Modifieds) | 6th | - | 4th | - |
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| 3/20/2021 | Beatrice Speedway - Beatrice, NE 28th Annual Beatrice Spring Nationals - Show #2 Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Sport Compact, IMCA Modified | Results | | Jim Mathieson (A Modifieds) | - | - | - | - |
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| 4/17/2021 | Park Jefferson International Speedway - Jefferson, SD Lucas Oil ASCS and RACESaver Sioux City Sprint Nationals plus IMCA Modifieds& Stock Cars 360 Sprints - Winged: ASCS National IMCA Modified, IMCA Stock Car, IMCA RaceSaver Sprint Car | Results | | Jim Mathieson (IMCA Modified) | 6th | - | - | 11th |
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| 4/18/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Frostbuster IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 4th | - | - | 12th (DNF) |
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| 4/25/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 3rd | - | - | 5th |
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| 5/2/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 2nd | - | - | 10th (DNF) |
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| 5/9/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 3rd | - | - | DNS |
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| 5/16/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series Dirt Late Models: Tri-State Late Models IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 7th | - | - | 11th |
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| 5/21/2021 | Murray County Speedway - Slayton, MN Regular Night Factory Stocks, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Sport Compact | Results | | Jim Mathieson (A Modifieds) | 6th | - | - | 12th |
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| 5/22/2021 | Worthington Speedway - Worthington, MN Season Opener Hobby Stocks, Stock Cars, Sportsmans, A Modifieds, B Modifieds, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (A Modifieds) | 3rd | - | - | 9th |
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| 5/23/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 4th | - | - | 9th |
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| 5/29/2021 | Park Jefferson International Speedway - Jefferson, SD 410 Sprint Cars featuring NOSA plus IMCA 410 Sprints - Winged: Northern Outlaw Sprint Association B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Jim Mathieson (IMCA Modified) | 5th | - | - | 12th |
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| 5/30/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 1st | - | - | 1st |
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| 5/31/2021 | Park Jefferson International Speedway - Jefferson, SD Memorial Day Duels $1,000 to win IMCA Modifieds/Stock Cars/RACESavers plus IMCA Sport Mods & Hobbies B Modifieds, Street Stocks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Jim Mathieson (IMCA Modified) | 6th | - | - | 10th |
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| 6/6/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 1st | - | - | 4th |
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| 6/7/2021 | Clay County Fair Speedway - Spencer, IA Cole Millard Memorial IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 7th | - | - | 17th (DNF) |
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| 6/12/2021 | Worthington Speedway - Worthington, MN Regular Night Hobby Stocks, Stock Cars, Sportsmans, A Modifieds, B Modifieds, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (A Modifieds) | 2nd | - | - | 7th |
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| 6/13/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 3rd | - | - | 10th (DNF) |
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| 6/20/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 5th | - | - | 11th (DNF) |
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| 6/24/2021 | Princeton Speedway - Princeton, MN Siercks Memorial Hobby Stocks, A Modifieds, B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Jim Mathieson (IMCA Modified) | 3rd | - | 6th | - |
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| 6/25/2021 | North Central Speedway - Brainerd, MN 10000 lakes 10k A Modifieds, B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Jim Mathieson (IMCA Modified) | 7th | - | 13th | - |
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| 6/26/2021 | North Central Speedway - Brainerd, MN 10000 lakes 10k IMCA Modified: Land of Ten Thousand Lakes 10K A Modifieds, B Modifieds, IMCA Northern SportMod, IMCA Stock Car | Results | | Jim Mathieson (IMCA Modified) | 7th | - | 14th | - |
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| 6/27/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series IMCA Modified: Midwest Madness Tour IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 8th (DNF) | - | DNS | - |
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| 6/29/2021 | Clay County Fair Speedway - Spencer, IA Midwest Madness Tour IMCA Modified: Midwest Madness Tour IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 7th | - | 10th | - |
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| 6/30/2021 | Buena Vista Raceway - Alta, IA Midwest Madness Tour/Kyle Suter Memorial Race IMCA Modified: Midwest Madness Tour Hobby Stocks, Stock Cars, B Modifieds, Sport Compact, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 8th (DNF) | - | 9th | - |
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| 7/26/2021 | Park Jefferson International Speedway - Jefferson, SD $1,000 to win IMCA Fast Shafts Qualifier at Park Jefferson B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Jim Mathieson (IMCA Modified) | 7th | - | - | 7th |
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| 8/9/2021 | Park Jefferson International Speedway - Jefferson, SD J&J Fitting Iron Cup Night 1 B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 4th | - | - | 14th |
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| 8/10/2021 | Park Jefferson International Speedway - Jefferson, SD J&J Fitting Iron Cup Night 2 B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 1st | - | - | 12th |
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| 8/14/2021 | Park Jefferson International Speedway - Jefferson, SD I State Truck Center IMCA Championship plus $2,000 to win Tri-State Late Models by Zeitner & Sons Dirt Late Models: Tri-State Late Models Hobby Stocks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Jim Mathieson (IMCA Modified) | 7th | - | - | 7th |
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| 8/21/2021 | Worthington Speedway - Worthington, MN Regular Night Hobby Stocks, Stock Cars, Sportsmans, A Modifieds, B Modifieds, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (A Modifieds) | 7th (DNF) | - | - | 12th |
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| 9/3/2021 | Interstate Speedway (SD) - Jefferson, SD Agrivision Equipment Night Dirt Late Models: Tri-State Late Models IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 5th | - | - | 8th |
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| 9/8/2021 | Boone Speedway - Boone, IA 2021 IMCA Speedway Motors Super Nationals Fueled by Casey’s IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Jim Mathieson (IMCA Modified) | 7th (DNF) | - | - | - |
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| 9/9/2021 | Boone Speedway - Boone, IA 2021 IMCA Speedway Motors Super Nationals Fueled by Casey’s Sportsmans, Midwest Modifieds, Vintage Full Body Stock Cars, IMCA Modified, IMCA Stock Car | Results | | Jim Mathieson (IMCA Modified) | 6th | - | 11th | - |
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| 9/10/2021 | Boone Speedway - Boone, IA 2021 IMCA Speedway Motors Super Nationals Fueled by Casey’s Generic 2, IMCA Modified, IMCA Stock Car | Results | | Jim Mathieson (IMCA Modified) | 10th (DNF) | - | - | - |
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| 9/11/2021 | Boone Speedway - Boone, IA 2021 IMCA Speedway Motors Super Nationals Fueled by Casey’s Midwest Modifieds, Vintage Full Body Stock Cars, Vintage Modifieds, Generic 1, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Jim Mathieson (IMCA Modified) | 12th (DNF) | - | - | - |
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| 9/19/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing 305 Sprints - Winged, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA RaceSaver Sprint Car, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 4th | - | - | 4th |
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| 9/26/2021 | Interstate Speedway (SD) - Jefferson, SD Season Championship IMCA Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 1st | - | - | 4th |
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| 10/2/2021 | Interstate Speedway (SD) - Jefferson, SD SD Nationals IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 4th | - | - | 9th |
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| 10/3/2021 | Interstate Speedway (SD) - Jefferson, SD SD Nationals IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Mathieson (IMCA Modified) | 3rd | - | - | 6th |
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