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| 3/5/2021 | RPM Speedway - Crandall, TX Texas Spring Nationals Night 1 A Modifieds: USMTS - United States Modified Touring Series Dwarf, Limited Sport Mod, USRA Limited Mods, USRA Factory Stocks, USRA Tuners | Results | | Brennon Marshall (USRA Factory Stocks) | 10th | - | 8th | - |
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| 3/6/2021 | RPM Speedway - Crandall, TX Texas Spring Nationals Night 2 A Modifieds: USMTS - United States Modified Touring Series Limited Sport Mod, USRA Limited Mods, USRA Factory Stocks, USRA Tuners | Results | | Brennon Marshall (USRA Factory Stocks) | 8th | - | 11th | - |
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| 3/13/2021 | Devil's Bowl Speedway - Mesquite, TX Texas 305 RaceSaver Sprint Nationals Saturday 305 Sprints - Winged, USRA Factory Stocks | Results | | Brennon Marshall (USRA Factory Stocks) | 4th | - | - | 14th |
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| 4/2/2021 | RPM Speedway - Crandall, TX 305 Sprints - Non-Winged, Limited Sport Mod, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks, USRA Tuners | Results | | Brennon Marshall (Limited Sport Mod) | 5th | - | - | 5th |
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| 5/14/2021 | RPM Speedway - Crandall, TX KR Cup Round #6 Dwarf, Limited Sport Mod, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks, USRA Tuners | Results | | Brennon Marshall (Limited Sport Mod) | 7th | - | - | DNS |
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| 6/17/2021 | RPM Speedway - Crandall, TX KR Cup Event Limited Sport Mod, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks, USRA Tuners | Results | | Brennon Marshall (Limited Sport Mod) | 7th | - | - | 17th |
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| 7/10/2021 | Devil's Bowl Speedway - Mesquite, TX Weekly Championship Series #12 305 Sprints - Winged, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks | Results | | Brennon Marshall (USRA Factory Stocks) | 6th | - | - | 14th |
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| 8/21/2021 | Devil's Bowl Speedway - Mesquite, TX Weekly Championship Series #17 305 Sprints - Winged, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks | Results | | Brennon Marshall (USRA Limited Mods) | 5th | - | - | 18th |
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| 9/4/2021 | RPM Speedway - Crandall, TX 7th Annual Bryan Mize Memorial USRA Modifieds: USRA American Racer Modified Series A Modifieds, Dwarf, Limited Modified, USRA Limited Mods, USRA Factory Stocks | Results | | Brennon Marshall (USRA Limited Mods) | 8th | - | 12th | - |
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| 9/5/2021 | RPM Speedway - Crandall, TX 3rd Annual Ronny Sigman Memorial Dirt Late Models: XR Southern Storm USRA Modifieds: USRA American Racer Modified Series A Modifieds, Limited Sport Mod, USRA Limited Mods, USRA Factory Stocks, USRA Tuners | Results | | Brennon Marshall (Limited Sport Mod) | 8th | - | 8th | - |
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| 9/11/2021 | Kennedale Speedway Park - Kennedale, TX FACTORY STOCK & SPORT MOD SHOOTOUT + LATE MODELS & ECO MODS Factory Stocks, B Modifieds, Dirt Late Models, IMCA Southern SportMod | Results | | Brennon Marshall (B Modifieds) | 5th | - | - | 13th |
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| 10/23/2021 | RPM Speedway - Crandall, TX Inaugural Cowboy Up Classic USRA Modifieds: USRA American Racer Modified Series Limited Modified, Limited Sport Mod, USRA Limited Mods, USRA Factory Stocks, USRA Tuners | Results | | Brennon Marshall (Limited Sport Mod) | 6th | - | 4th | 16th |
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