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| 6/13/2021 | Mason City Motor Speedway - Mason City, IA Season Opener USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Colby Grady (USRA B-Mods) | 8th (DNF) | - | DNS | - |
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| 7/11/2021 | Mason City Motor Speedway - Mason City, IA Joel Showalter Memorial Presented by Window World 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars | Results | | Colby Grady (USRA B-Mods) | 8th (DNF) | - | - | 23rd (DNF) |
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| 7/18/2021 | Mason City Motor Speedway - Mason City, IA United States Modified Touring Series fueled by Casey's A Modifieds: USMTS - United States Modified Touring Series 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars | Results | | Colby Grady (USRA B-Mods) | 7th | - | - | 14th |
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| 7/25/2021 | Mason City Motor Speedway - Mason City, IA Kids Night 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars | Results | | Colby Grady (USRA B-Mods) | 8th | - | - | 13th (DNF) |
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| 8/1/2021 | Mason City Motor Speedway - Mason City, IA Modified Madness Presented by Fertilizer Equipment Specialists USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Colby Grady (USRA B-Mods) | 8th | - | - | 19th (DNF) |
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| 8/8/2021 | Mason City Motor Speedway - Mason City, IA Ted Zieman Memorial (Fair Races) Presented by Pabst Blue Ribbon 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars | Results | | Colby Grady (USRA B-Mods) | 7th | - | - | 13th |
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| 8/15/2021 | Mason City Motor Speedway - Mason City, IA B-Mod Challenge Presented by Kabrick Distributing 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars | Results | | Colby Grady (USRA B-Mods) | 8th | - | 10th (DNF) | - |
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| 8/22/2021 | Mason City Motor Speedway - Mason City, IA Driver Appreciation Night 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Colby Grady (USRA B-Mods) | 6th | - | - | 21st (DNF) |
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| 10/3/2021 | Mason City Motor Speedway - Mason City, IA Fall Frenzy USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Colby Grady (USRA B-Mods) | 7th | - | - | 9th |
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