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| 3/12/2021 | Devil's Bowl Speedway - Mesquite, TX Texas 305 RaceSaver Sprint Nationals Friday 305 Sprints - Winged, USRA Limited Mods | Results | | Colby Stubblefield (305 Sprints - Winged) | 3rd | - | - | 7th |
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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 | | Colby Stubblefield (305 Sprints - Winged) | 4th | - | 6th | - |
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| 3/19/2021 | Devil's Bowl Speedway - Mesquite, TX 360 Sprints - Winged: ASCS National with ASCS Lone Star Region 305 Sprints - Winged, USRA Modifieds, USRA Factory Stocks | Results | | Colby Stubblefield (305 Sprints - Winged) | 4th | - | - | 7th |
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| 3/20/2021 | Devil's Bowl Speedway - Mesquite, TX 360 Sprints - Winged: ASCS National with ASCS Lone Star Region 305 Sprints - Winged, USRA Limited Mods, Dirt Big Block Modifieds | Results | | Colby Stubblefield (305 Sprints - Winged) | 3rd | - | - | 2nd |
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| 3/26/2021 | Monarch Motor Speedway - Wichita Falls, TX 305 Sprints - Winged: Texas Sprint Series B Modifieds, Pony Stock, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks, USRA Tuners, IMCA RaceSaver Sprint Car | Results | | Colby Stubblefield (IMCA RaceSaver Sprint Car) | 1st | - | - | 8th |
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| 3/27/2021 | Devil's Bowl Speedway - Mesquite, TX 2021 Points Opener 305 Sprints - Winged, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks | Results | | Colby Stubblefield (305 Sprints - Winged) | 1st | - | - | 3rd |
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| 4/10/2021 | Rocket Raceway Park - Petty, TX $5,000/win FACTORY STOCKS! TEXAS SPRINT SERIES! 305 Sprints - Winged: Texas Sprint Series Hobby Stocks, Stock Cars, 600cc Modifieds, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks, IMCA RaceSaver Sprint Car | Results | | Colby Stubblefield (IMCA RaceSaver Sprint Car) | 3rd | - | - | 9th |
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| 4/17/2021 | Southern Oklahoma Speedway - Ardmore, OK Texas Sprint Series 305 Sprints - Winged, Hobby Stocks, Stock Cars, 600cc Modifieds, Limited Sport Mod, IMCA Stock Car, IMCA RaceSaver Sprint Car | Results | | Colby Stubblefield (IMCA RaceSaver Sprint Car) | 5th | - | - | 14th |
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| 4/24/2021 | Devil's Bowl Speedway - Mesquite, TX Weekly Championship Series #3 305 Sprints - Winged, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks | Results | | Colby Stubblefield (305 Sprints - Winged) | 3rd | - | - | 7th |
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| 5/8/2021 | Grayson County Speedway - Bells, TX Race Program / TSS Sprints 305 Sprints - Winged: IMCA RaceSaver Sprints Factory Stocks, Hobby Stocks, 600cc Modifieds, IMCA Southern SportMod, IMCA RaceSaver Sprint Car | Results | | Colby Stubblefield (305 Sprints - Winged) | - | - | - | - | | Colby Stubblefield (IMCA RaceSaver Sprint Car) | 3rd | - | 14th | - |
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| 5/15/2021 | Kennedale Speedway Park - Kennedale, TX 305 Sprints - Winged: Texas Sprint Series Factory Stocks, IMCA Modified, IMCA Southern SportMod, IMCA Stock Car, IMCA RaceSaver Sprint Car, IMCA Sport Compact | Results | | Colby Stubblefield (IMCA RaceSaver Sprint Car) | 5th | - | 3rd | 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 | | Colby Stubblefield (305 Sprints - Winged) | 3rd | - | - | 5th |
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| 6/19/2021 | Devil's Bowl Speedway - Mesquite, TX Weekly Championship Series #9 305 Sprints - Winged, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks | Results | | Colby Stubblefield (305 Sprints - Winged) | 4th | - | - | 21st |
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| 6/26/2021 | Devil's Bowl Speedway - Mesquite, TX Weekly Championship Series #10 305 Sprints - Winged, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks | Results | | Colby Stubblefield (305 Sprints - Winged) | 4th | - | - | 9th |
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| 7/3/2021 | Monarch Motor Speedway - Wichita Falls, TX Firework Spectacular!! $1000/win Demo Derby 305 Sprints - Winged: Texas Sprint Series B Modifieds, Pony Stock, USRA Limited Mods, USRA Factory Stocks, USRA Tuners, IMCA RaceSaver Sprint Car | Results | | Colby Stubblefield (IMCA RaceSaver Sprint Car) | 1st | - | - | 7th |
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| 7/10/2021 | Kennedale Speedway Park - Kennedale, TX 305 Sprints - Winged: Texas Sprint Series Factory Stocks, IMCA Modified, IMCA Southern SportMod, IMCA Stock Car, IMCA RaceSaver Sprint Car, IMCA Sport Compact | Results | | Colby Stubblefield (IMCA RaceSaver Sprint Car) | 1st | - | - | 10th |
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| 7/17/2021 | Devil's Bowl Speedway - Mesquite, TX Weekly Championship Series #13 305 Sprints - Winged, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks | Results | | Colby Stubblefield (305 Sprints - Winged) | 5th | - | - | 6th |
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| 7/24/2021 | Southern Oklahoma Speedway - Ardmore, OK Texas Sprint Series 305 Sprints - Winged: Texas Sprint Series Hobby Stocks, Stock Cars, 600cc Modifieds, Limited Sport Mod, IMCA RaceSaver Sprint Car | Results | | Colby Stubblefield (IMCA RaceSaver Sprint Car) | 2nd | - | - | 19th (DNF) |
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| 7/31/2021 | Abilene Speedway - Abilene, TX TEXAS SPRINT CAR SERIES NIGHT 305 Sprints - Winged: Texas Sprint Series Stock Cars, Street Stocks, IMCA Modified, IMCA Southern SportMod, IMCA Stock Car, IMCA RaceSaver Sprint Car, IMCA Sport Compact | Results | | Colby Stubblefield (IMCA RaceSaver Sprint Car) | 3rd | - | - | 2nd |
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| 8/6/2021 | RPM Speedway - Crandall, TX 305 Sprints - Non-Winged, Limited Sport Mod, USRA Limited Mods, USRA Modifieds, USRA Factory Stocks, USRA Tuners | Results | | Colby Stubblefield (305 Sprints - Non-Winged) | 4th | - | - | 4th |
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| 8/13/2021 | Boyd Raceway - Boyd, TX 305 Sprints - Winged, Factory Stocks, Street Stocks, Limited Sport Mod, Sport Compact, IMCA RaceSaver Sprint Car, IMCA Sport Compact | Results | | Colby Stubblefield (IMCA RaceSaver Sprint Car) | 8th | - | 5th | 9th |
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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 | | Colby Stubblefield (305 Sprints - Winged) | 3rd | - | - | 17th |
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| 8/28/2021 | Abilene Speedway - Abilene, TX DROUGHT BUSTER & TEXAS SPRINT SERIES !!!! 305 Sprints - Winged: Texas Sprint Series Stock Cars, Street Stocks, IMCA Modified, IMCA Southern SportMod, IMCA Stock Car, IMCA RaceSaver Sprint Car, IMCA Sport Compact | Results | | Colby Stubblefield (IMCA RaceSaver Sprint Car) | 3rd | - | - | 2nd |
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| 10/2/2021 | Big O Speedway - Ennis, TX Winged Sprints, DIRTcar Late Models, Factory Stocks, Hornets, Limited Sport Mod, USRA Modifieds, USRA Factory Stocks, Figure 8 - FWD Stock | Results | | Colby Stubblefield (Winged Sprints) | 3rd | - | - | 6th |
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| 10/16/2021 | Devil's Bowl Speedway - Mesquite, TX 360 Sprints - Winged: ASCS National with ASCS Lone Star Region 305 Sprints - Winged, USRA Limited Mods, Dirt Big Block Modifieds | Results | | Colby Stubblefield (305 Sprints - Winged) | 6th | - | - | 5th |
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