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| 3/10/2021 | Humboldt Speedway - Humboldt, KS Battle at the Bullring Practice Dirt Super Late Models, Factory Stocks, Stock Cars, A Modifieds, Midwest Modifieds, B Modifieds, Sport Compact, USRA B-Mods, USRA Modifieds | Rain Out |
| 3/24/2021 | Humboldt Speedway - Humboldt, KS KOA and Battle Practice A Modifieds: USMTS - United States Modified Touring Series B Modifieds, USRA B-Mods, USRA Modifieds, USRA Stock Cars | Results | | Nathan Grehl (USRA B-Mods) | - | - | - | - |
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| 5/1/2021 | Miller Central Speedway - Miller, SD Season Opener- Sponsored by Quoin Financial Bank Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 1st | - | - | 16th (DNF) |
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| 5/15/2021 | Miller Central Speedway - Miller, SD Regular Races Sponsored by Agtegra Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 6th (DNF) | - | - | 13th |
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| 5/22/2021 | Miller Central Speedway - Miller, SD Regular Races sponsored by Nelson's HB Seed Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 2nd | - | - | 13th (DNF) |
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| 5/31/2021 | Madison Speedway - Madison, MN Season Opener Stock Cars, Economy Late Models, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Street Stock, WISSOTA Super Stock, WISSOTA Hornet | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 1st | - | - | 5th |
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| 6/5/2021 | Dakota State Fair Speedway - Huron, SD Structural Buildings WISSOTA Late Model Challenge Series WISSOTA Late Model: Wissota Late Model Challenge Series WISSOTA Midwest Mods | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 5th | - | - | 10th |
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| 6/12/2021 | Miller Central Speedway - Miller, SD Tri-State Late Model Series Dirt Late Models: Tri-State Late Models Pure Stock, WISSOTA Midwest Mods, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 6th | - | - | 9th |
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| 6/19/2021 | Miller Central Speedway - Miller, SD ROC Races Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 2nd | - | - | 4th |
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| 6/26/2021 | Miller Central Speedway - Miller, SD Regular Races Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 5th | - | - | 6th |
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| 7/1/2021 | Dakota State Fair Speedway - Huron, SD Stock Car Racing WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 5th | - | - | 19th (DNF) |
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| 7/3/2021 | Miller Central Speedway - Miller, SD 4th of July Special Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 3rd | - | - | 13th |
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| 7/10/2021 | Bandit Speedway - Box Elder, SD Race Night A Modifieds, Non-Winged Sprints, WISSOTA Street Stock | Results | | Nathan Grehl (A Modifieds) | DNS | - | - | 4th |
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| 7/17/2021 | Miller Central Speedway - Miller, SD Regular Races Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 5th (DNF) | - | - | 10th |
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| 7/24/2021 | Miller Central Speedway - Miller, SD Street Stock Special Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 6th (DNF) | - | - | 17th (DNF) |
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| 7/31/2021 | Miller Central Speedway - Miller, SD Regular Races Pure Stock, WISSOTA Midwest Mods, WISSOTA Modifieds, WISSOTA Late Model, WISSOTA Street Stock, WISSOTA Super Stock | Results | | Nathan Grehl (WISSOTA Midwest Mods) | 4th | - | - | 21st (DNF) |
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