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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 | | David Miller (IMCA Hobby Stock) | 3rd | - | - | 1st |
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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 | | David Miller (IMCA Hobby Stock) | 3rd | - | - | 20th (DNF) |
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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 | | David Miller (IMCA Hobby Stock) | 3rd | - | - | 1st |
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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 | | David Miller (IMCA Hobby Stock) | 6th (DNF) | - | 4th | 4th |
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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 | | David Miller (IMCA Hobby Stock) | 2nd | - | - | 7th |
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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 | | David Miller (IMCA Hobby Stock) | 2nd | - | - | 1st |
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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 | | David Miller (IMCA Hobby Stock) | 2nd | - | - | 1st |
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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 | | David Miller (IMCA Hobby Stock) | 1st | - | - | 6th |
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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 | | David Miller (IMCA Hobby Stock) | 2nd | - | - | 1st |
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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 | | David Miller (IMCA Hobby Stock) | 2nd | - | - | 4th |
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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 | | David Miller (IMCA Hobby Stock) | 1st | - | - | 2nd |
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| 7/4/2021 | Interstate Speedway (SD) - Jefferson, SD 4th of July Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | David Miller (IMCA Hobby Stock) | 3rd | - | - | 2nd |
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| 7/11/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Mid Season Championship IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | David Miller (IMCA Hobby Stock) | 2nd | - | - | 6th |
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| 7/18/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | David Miller (IMCA Hobby Stock) | 2nd | - | - | 2nd |
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| 7/25/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | David Miller (IMCA Hobby Stock) | 1st | - | - | 2nd |
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| 8/1/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | David Miller (IMCA Hobby Stock) | 2nd | - | - | 3rd |
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| 8/8/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | David Miller (IMCA Hobby Stock) | 3rd | - | - | 4th |
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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 | | David Miller (IMCA Hobby Stock) | 1st | - | - | 5th |
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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 | | David Miller (IMCA Hobby Stock) | 2nd | - | - | 3rd |
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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 | | David Miller (Hobby Stocks) | - | - | - | - | | David Miller (IMCA Hobby Stock) | 1st | - | - | 2nd |
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| 8/15/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | David Miller (IMCA Hobby Stock) | 2nd | - | - | 1st |
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| 8/22/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | David Miller (IMCA Hobby Stock) | 1st | - | - | 2nd |
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| 8/29/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | David Miller (IMCA Hobby Stock) | 3rd | - | - | 1st |
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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 | | David Miller (IMCA Hobby Stock) | 1st | - | - | 5th |
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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 | | David Miller (IMCA Hobby Stock) | 2nd | - | - | 5th |
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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 | | David Miller (IMCA Hobby Stock) | 2nd | - | - | 2nd |
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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 | | David Miller (IMCA Hobby Stock) | 3rd | - | - | 1st |
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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 | | David Miller (IMCA Hobby Stock) | - | - | - | 1st |
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