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| 4/23/2021 | Mississippi Thunder Speedway - Fountain City, WI 13th Annual Season Opener presented by Kelly Iverson Trucking Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks | Results | | Devin Holthaus (USRA Hobby Stocks) | 6th | - | - | 8th |
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| 4/30/2021 | Mississippi Thunder Speedway - Fountain City, WI Weekly Racing Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks | Results | | Devin Holthaus (USRA Hobby Stocks) | 4th | - | - | 11th (DNF) |
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| 5/7/2021 | Fayette County Speedway - West Union, IA Weekly Points Race ~ Tuner Special 600cc Modifieds, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Devin Holthaus (USRA Hobby Stocks) | 5th | - | - | 12th |
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| 5/14/2021 | Mississippi Thunder Speedway - Fountain City, WI Weekly Racing Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks | Rain Out |
| 5/22/2021 | Winneshiek Raceway - Decorah, IA Sponsored by Weis Buick GMC USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners, Mod Lites | Results | | Devin Holthaus (USRA Hobby Stocks) | 3rd | - | - | 9th |
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| 5/28/2021 | Rapid Speedway - Rock Rapids, IA 13th Annual USMTS Rapid Rumble A Modifieds: USMTS - United States Modified Touring Series DIRTcar Sportsmans, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Devin Holthaus (USRA Hobby Stocks) | 3rd | - | - | 10th |
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| 5/30/2021 | Winneshiek Raceway - Decorah, IA 13th Annual USMTS Nordic Nationals A Modifieds: USMTS - United States Modified Touring Series USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Devin Holthaus (USRA Hobby Stocks) | 7th | - | - | 15th |
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| 6/11/2021 | Mississippi Thunder Speedway - Fountain City, WI Weekly Racing Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks | Results | | Devin Holthaus (USRA Hobby Stocks) | 4th | - | - | 3rd |
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| 6/12/2021 | Winneshiek Raceway - Decorah, IA USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners, Mod Lites | Results | | Devin Holthaus (USRA Hobby Stocks) | 5th | - | - | 7th |
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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 | | Devin Holthaus (USRA Hobby Stocks) | 4th | - | - | 12th |
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| 6/24/2021 | Cresco Speedway - Cresco, IA Cresco Speeway - EAST Dirt Super Late Models: SLMR Late Model Series USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Devin Holthaus (USRA Hobby Stocks) | 5th | - | - | 7th |
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| 7/2/2021 | Mississippi Thunder Speedway - Fountain City, WI Karl Fenske Memorial Dirt Late Models, Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks | Results | | Devin Holthaus (USRA Hobby Stocks) | 5th | - | - | 11th |
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| 7/9/2021 | Mississippi Thunder Speedway - Fountain City, WI Firecracker 40 Dirt Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks | Results | | Devin Holthaus (USRA Hobby Stocks) | 4th | - | - | 6th |
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| 7/23/2021 | Cresco Speedway - Cresco, IA Friday Night Races at Cresco Speedway 600cc Modifieds, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Devin Holthaus (USRA Hobby Stocks) | 3rd | - | - | 6th |
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| 7/30/2021 | Mississippi Thunder Speedway - Fountain City, WI K-Town Klash USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks | Results | | Devin Holthaus (USRA Hobby Stocks) | 7th | - | 1st | 9th |
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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 | | Devin Holthaus (USRA Hobby Stocks) | 3rd | - | - | 9th |
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| 8/6/2021 | Mississippi Thunder Speedway - Fountain City, WI Weekly Racing Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks | Results | | Devin Holthaus (USRA Hobby Stocks) | 5th | - | - | 6th |
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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 | | Devin Holthaus (USRA Hobby Stocks) | 5th | - | - | 13th |
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| 9/18/2021 | Deer Creek Speedway - Spring Valley, MN Stock Car Nationals USRA Hobby Stocks, USRA Stock Cars | Results | | Devin Holthaus (USRA Hobby Stocks) | 2nd | - | - | 21st (DNF) |
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| 10/1/2021 | Mississippi Thunder Speedway - Fountain City, WI The Great Pumpkin Race Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks, USRA Stock Cars | Results | | Devin Holthaus (USRA Hobby Stocks) | 6th | - | - | 14th |
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| 10/2/2021 | Mississippi Thunder Speedway - Fountain City, WI The Great Pumpkin Race Hornets, USRA B-Mods, USRA Modifieds, USRA Late Models, USRA Hobby Stocks, USRA Stock Cars | Results | | Devin Holthaus (USRA Hobby Stocks) | 5th | - | - | DNS |
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