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| 4/10/2021 | Texana Raceway Park - Edna, TX Jude Allgayer Racing Night at the Races 305 Sprints - Winged, Factory Stocks, A Modifieds, B Modifieds, Street Stocks, Dirt Cage Kart Junior 1, Limited Sport Mod, IMCA Mod Lite, Cage Jr. Predator, Cage Sr. Predator | Results | | Mason Castaneda (Limited Sport Mod) | 4th | - | - | 13th |
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| 5/7/2021 | South Texas Race Ranch - Corpus Christi, TX South Texas Speedway Season Opener Factory Stocks, Stock Cars, Sportsmans, B Modifieds | Results | | Mason Castaneda (B Modifieds) | 5th | - | 2nd | 18th |
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| 5/8/2021 | South Texas Race Ranch - Corpus Christi, TX 1333 Throwdown Factory Stocks, Stock Cars, Sportsmans, B Modifieds | Results | | Mason Castaneda (B Modifieds) | 2nd | - | - | 15th |
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| 5/22/2021 | I-37 Speedway - Pleasanton, TX King Of The Hill Night Mods Factory Stocks, Asphalt Mini Stocks, Street Stocks, Dirt Pro Trucks, Limited Modified, IMCA Modified | Results | | Mason Castaneda (Limited Modified) | 5th | - | - | 6th |
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| 5/30/2021 | Texana Raceway Park - Edna, TX Tony's Mobil Home Service Salute to the Troops Featuring the STLMS Late Models Dirt Late Models: XR Southern Storm Factory Stocks, A Modifieds, B Modifieds, Street Stocks, Dirt Cage Kart Junior 1, Flat Adult Clone, Dirt Pro Trucks, Limited Sport Mod, IMCA Mod Lite, Cage Jr. Predator, Cage Sr. Predator | Results | | Mason Castaneda (Limited Sport Mod) | 5th | - | - | 9th |
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| 7/17/2021 | I-37 Speedway - Pleasanton, TX I-37 Speedway Race Night Dirt Pro Trucks: South Texas Dirt Trucks Factory Stocks, Asphalt Mini Stocks, Street Stocks, Economy Late Models, Limited Modified | Results | | Mason Castaneda (Limited Modified) | 2nd | - | - | 2nd |
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| 7/24/2021 | Texana Raceway Park - Edna, TX CCT Field Services Night at the Races Factory Stocks, A Modifieds, Restricted 'A' Class, Stock Non-Wing, B Modifieds, Street Stocks, Dirt Cage Kart Junior 1, Flat Adult Clone, Limited Sport Mod, Pro Dwarf, IMCA Mod Lite, Cage Jr. Predator, Cage Sr. Predator | Results | | Mason Castaneda (Limited Sport Mod) | 3rd | - | - | DNS |
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| 8/14/2021 | Texana Raceway Park - Edna, TX Sames Ford Back to School Blowout Featuring the SUS Sprint Cars 305 Sprints - Winged, DIRTcar Sport Compact, Factory Stocks, A Modifieds, B Modifieds, Street Stocks, Dirt Cage Kart Junior 1, Flat Adult Clone, Limited Sport Mod, IMCA Mod Lite, Cage Jr. Predator, Cage Sr. Predator | Results | | Mason Castaneda (Factory Stocks) | 4th | - | - | 11th |
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| 8/20/2021 | South Texas Race Ranch - Corpus Christi, TX South Texas Speedway Racing Factory Stocks, Stock Cars, Sportsmans, B Modifieds | Results | | Mason Castaneda (B Modifieds) | 7th | - | - | 7th |
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| 8/21/2021 | South Texas Race Ranch - Corpus Christi, TX Tecate Championship Chase Race 1 Factory Stocks, Stock Cars, Sportsmans, B Modifieds, Dirt Late Models, Dwarf | Results | | Mason Castaneda (B Modifieds) | 4th | - | - | 15th |
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| 9/4/2021 | South Texas Race Ranch - Corpus Christi, TX South Texas Speedway Racing Factory Stocks, Stock Cars, Sportsmans, B Modifieds, Dirt Late Models, Dwarf, 600cc Modifieds, Dirt Pro Trucks | Results | | Mason Castaneda (B Modifieds) | DNS | - | - | 17th (DNF) |
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| 9/18/2021 | I-37 Speedway - Pleasanton, TX I-37 Speedway Race Night Factory Stocks, Asphalt Mini Stocks, Street Stocks, Economy Late Models, Limited Modified, IMCA Modified | Results | | Mason Castaneda (Limited Modified) | 2nd | - | - | 3rd |
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| 10/30/2021 | I-37 Speedway - Pleasanton, TX DTK Memorial Night 2 Factory Stocks, Asphalt Mini Stocks, Limited Modified, IMCA Modified | Results | | Mason Castaneda (Limited Modified) | 5th | - | - | 14th |
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| 12/9/2021 | South Texas Race Ranch - Corpus Christi, TX Jerry Whiteaker Memorial 3 Practice Factory Stocks, Asphalt Mini Stocks, Stock Cars, Sportsmans, A Modifieds, B Modifieds, Street Stocks, Dirt Late Models, 250cc Open | Results | | Mason Castaneda (B Modifieds) | - | - | - | - |
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| 12/10/2021 | South Texas Race Ranch - Corpus Christi, TX Jerry Whiteaker Memorial 3 Qualifying Night Factory Stocks, Stock Cars, Sportsmans, B Modifieds | Results | | Mason Castaneda (B Modifieds) | 7th | - | - | - |
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| 12/11/2021 | South Texas Race Ranch - Corpus Christi, TX Jerry Whiteaker Memorial 3 Championship Night Factory Stocks, Stock Cars, Sportsmans, A Modifieds, B Modifieds, Dirt Late Models | Results | | Mason Castaneda (B Modifieds) | - | - | 8th | - |
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