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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 | | Gregory Muirhead (USRA Limited Mods) | DNS | - | 9th | - |
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| 3/11/2021 | Southern Oklahoma Speedway - Ardmore, OK Southern Stampede Night 1 Stock Cars, 600cc Modifieds, Limited Sport Mod, IMCA Modified | Results | | Gregory Muirhead (IMCA Modified) | 7th | - | 13th | - |
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| 3/13/2021 | Big O Speedway - Ennis, TX Opening points Night DIRTcar Late Models, Factory Stocks, Hornets, 251cc+ Open Single, Limited Sport Mod, 450 Pro Single Framer, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks, Open Amateur | Results | | Gregory Muirhead (USRA Limited Mods) | 9th | - | - | 8th |
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| 3/20/2021 | Big O Speedway - Ennis, TX Weekly racing DIRTcar Late Models, Factory Stocks, Hornets, Limited Sport Mod, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks | Results | | Gregory Muirhead (USRA Limited Mods) | 2nd | - | - | 2nd |
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| 3/25/2021 | Humboldt Speedway - Humboldt, KS King Of America and Battle at the Bullring Night 1 A Modifieds: USMTS - United States Modified Touring Series B Modifieds, USRA B-Mods, USRA Modifieds, USRA Stock Cars | Results | | Gregory Muirhead (USRA B-Mods) | 9th | - | - | - |
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| 3/26/2021 | Humboldt Speedway - Humboldt, KS King Of America $5,000 to win + Battle Qualifying A Modifieds: USMTS - United States Modified Touring Series B Modifieds, USRA B-Mods, USRA Stock Cars | Results | | Gregory Muirhead (USRA B-Mods) | 6th | - | 9th | - |
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| 3/27/2021 | Humboldt Speedway - Humboldt, KS King Of America $20,000 to win, Battle at the Bullring $10,00 to win A Modifieds: USMTS - United States Modified Touring Series B Modifieds, USRA B-Mods, USRA Modifieds, USRA Stock Cars | Results | | Gregory Muirhead (USRA B-Mods) | - | - | - | - |
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| 4/3/2021 | Hunt County Raceway - Greenville, TX Texas Winged Modifieds Stock Cars, Restricted 'A' Class, Winged A-Class, Super Stocks, USRA Limited Mods, USRA Factory Stocks, USRA Tuners | Results | | Gregory Muirhead (USRA Factory Stocks) | 3rd | - | - | 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 | | Gregory Muirhead (USRA Limited Mods) | 2nd | - | - | 5th |
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| 5/30/2021 | Lonestar Speedway - Kilgore, TX Memorial Day Showdown Factory Stocks, A Modifieds, B Modifieds, Dirt Late Models, Sport Compact | Results | | Gregory Muirhead (A Modifieds) | 7th | - | - | 8th |
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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 | | Gregory Muirhead (USRA Modifieds) | 1st | - | - | 2nd |
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| 6/11/2021 | Heart O' Texas Speedway - Waco, TX Touring Outlaw Modified Series - Kids Bicycle Races A Modifieds: TOMS - Touring Outlaw Modified Series Factory Stocks, Street Stocks, Limited Modified, Limited Sport Mod, IMCA Southern SportMod, IMCA Stock Car | Results | | Gregory Muirhead (A Modifieds) | 4th | - | 1st | 15th |
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| 6/12/2021 | Devil's Bowl Speedway - Mesquite, TX Weekly Championship Series #8 305 Sprints - Winged, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks | Results | | Gregory Muirhead (USRA Modifieds) | DNS | - | - | 12th |
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| 6/25/2021 | RPM Speedway - Crandall, TX KR Cup Round #9 Limited Sport Mod, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks, USRA Tuners, Dirt Big Block Modifieds | Results | | Gregory Muirhead (USRA Modifieds) | 6th | - | - | 10th |
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| 6/26/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, Hornets, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks, Dirt Winged Modifieds | Results | | Gregory Muirhead (USRA Modifieds) | 1st | - | - | 1st |
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| 7/31/2021 | Big O Speedway - Ennis, TX DIRTcar Late Models, Factory Stocks, Stock Cars, Hornets, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks, Dirt Winged Modifieds | Results | | Gregory Muirhead (USRA Modifieds) | 6th | - | - | 1st |
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| 8/7/2021 | Hunt County Raceway - Greenville, TX Weekly Show, USRA Modifieds Stock Cars, Restricted 'A' Class, Winged A-Class, Super Stocks, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks, USRA Tuners | Results | | Gregory Muirhead (USRA Modifieds) | 2nd | - | - | 5th |
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| 8/13/2021 | Big O Speedway - Ennis, TX FRIDAY NIGHT RACES 305 Sprints - Winged, DIRTcar Late Models, Factory Stocks, Limited Sport Mod, USRA Modifieds | Results | | Gregory Muirhead (USRA Modifieds) | 2nd | - | - | 2nd |
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| 8/21/2021 | Hunt County Raceway - Greenville, TX American Racer Modified Series Restricted 'A' Class: NOW600 Restricted Micros Winged A-Class: NOW600 A-Class Micros USRA Modifieds: USRA American Racer Modified Series Stock Cars, Super Stocks, USRA Limited Mods, USRA Factory Stocks, USRA Tuners | Results | | Gregory Muirhead (USRA Modifieds) | 2nd | - | - | 6th |
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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 | | Gregory Muirhead (USRA Modifieds) | 7th | - | 8th | - |
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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 | | Gregory Muirhead (USRA Modifieds) | 8th | - | 5th | - |
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| 9/9/2021 | RPM Speedway - Crandall, TX Inaugural USMTS Event A Modifieds: USMTS - United States Modified Touring Series USRA Limited Mods, USRA Factory Stocks, USRA Tuners | Results | | Gregory Muirhead (A Modifieds) | 8th | - | 10th | - |
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| 9/10/2021 | Ark-La-Tex Speedway - Vivian, LA USMTS 9th Annual Cajun Clash A Modifieds: USMTS - United States Modified Touring Series Factory Stocks, B Modifieds, Limited Modified, Sport Compact | Results | | Gregory Muirhead (A Modifieds) | 3rd | - | 9th | - |
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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 | | Gregory Muirhead (A Modifieds) | - | - | - | - | | Gregory Muirhead (USRA Modifieds) | 3rd | - | - | 1st |
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| 10/30/2021 | 81 Speedway - Park City, KS 2nd Annual USMTS Modified Spooktacular A Modifieds: USMTS - United States Modified Touring Series USRA B-Mods, USRA Modifieds | Results | | Gregory Muirhead (USRA B-Mods) | 4th | - | - | 18th |
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