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| 4/10/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, Hornets, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks, Dirt Winged Modifieds | Results | | William Kayser (Factory Stocks) | 2nd | - | - | 19th |
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| 5/8/2021 | Big O Speedway - Ennis, TX Saturday Night at BIG O DIRTcar Late Models, Factory Stocks, Hornets, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks | Results | | William Kayser (Factory Stocks) | 4th | - | - | 4th |
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| 6/5/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, Hornets, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks, Dirt Winged Modifieds | Results | | William Kayser (Factory Stocks) | 1st | - | - | 12th |
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| 6/12/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, Hornets, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks | Results | | William Kayser (Factory Stocks) | DNS | - | - | DNS |
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| 7/3/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, Hornets, Limited Sport Mod, USRA Factory Stocks | Results | | William Kayser (Factory Stocks) | 3rd | - | - | 3rd |
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| 7/10/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, Hornets, Limited Sport Mod, USRA Factory Stocks, Dirt Winged Modifieds | Results | | William Kayser (Factory Stocks) | 1st | - | - | 3rd |
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| 7/17/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, 305 Sprints - Non-Winged, Hornets, Limited Sport Mod, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks, USRA Tuners | Results | | William Kayser (Factory Stocks) | 3rd | - | - | 2nd |
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| 7/24/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, Hornets, Lightweight SuperSport, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks | Results | | William Kayser (Factory Stocks) | 3rd | - | - | 15th |
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| 7/30/2021 | Big O Speedway - Ennis, TX FRIDAY NIGHT RACING 305 Sprints - Winged, DIRTcar Late Models, Factory Stocks, Limited Sport Mod | Results | | William Kayser (Factory Stocks) | 3rd | - | - | 3rd |
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| 8/21/2021 | Big O Speedway - Ennis, TX Short Track Super Series Cajun Region. DIRTcar Late Models, Factory Stocks, Hornets, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks, Dirt Big Block Modifieds | Results | | William Kayser (Factory Stocks) | 1st | - | - | 6th |
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| 8/28/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, Stock Cars, Hornets, Lightweight SuperBike, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks, Dirt Winged Modifieds | Results | | William Kayser (Factory Stocks) | 6th | - | - | 4th |
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| 9/11/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, Hornets, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks, Dirt Winged Modifieds | Results | | William Kayser (Factory Stocks) | 1st | - | - | 1st |
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| 9/18/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, Stock Cars, Hornets, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks, Dirt Big Block Modifieds, Figure 8 - FWD Stock | Results | | William Kayser (Factory Stocks) | 7th | - | - | 7th |
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| 10/9/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, Hornets, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks | Results | | William Kayser (Factory Stocks) | DNS | - | - | 9th |
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