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| 3/24/2021 | Humboldt Speedway - Humboldt, KS KOA and Battle Practice A Modifieds: USMTS - United States Modified Touring Series B Modifieds, USRA B-Mods, USRA Modifieds, USRA Stock Cars | Results | | Darrin Korthals (USRA Stock Cars) | - | - | - | - |
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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 | | Darrin Korthals (USRA Stock Cars) | 4th | - | - | 13th |
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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 | | Darrin Korthals (USRA Stock Cars) | 4th | - | - | 12th |
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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 | | Darrin Korthals (USRA Stock Cars) | 4th | - | - | 14th |
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| 4/24/2021 | Rapid Speedway - Rock Rapids, IA Test N Tune 360 Sprints - Winged, DIRTcar Late Models, DIRTcar Sportsmans, Economy Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, IMCA RaceSaver Sprint Car | Results | | Darrin Korthals (USRA Stock Cars) | - | - | - | - |
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| 4/30/2021 | Rapid Speedway - Rock Rapids, IA Weekly Racing Series + 305 Sprints DIRTcar Sportsmans, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars, IMCA RaceSaver Sprint Car | Results | | Darrin Korthals (USRA Stock Cars) | 1st | - | - | 2nd |
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| 5/7/2021 | Rapid Speedway - Rock Rapids, IA Rapid Speedway - WEST Dirt Super Late Models: SLMR Late Model Series DIRTcar Sportsmans, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Darrin Korthals (USRA Stock Cars) | 2nd | - | - | 4th |
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| 5/21/2021 | Rapid Speedway - Rock Rapids, IA Weekly Racing Series + 360 Sprints 360 Sprints - Winged: Midwest Sprint Touring Series DIRTcar Sportsmans, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Darrin Korthals (USRA Stock Cars) | 2nd | - | - | 5th |
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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 | | Darrin Korthals (USRA Stock Cars) | 3rd | - | - | 5th |
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| 5/29/2021 | Deer Creek Speedway - Spring Valley, MN 18th Annual USMTS Southern MN Spring Challenge A Modifieds: USMTS - United States Modified Touring Series USRA B-Mods, USRA Stock Cars, WISSOTA Midwest Mods | Results | | Darrin Korthals (USRA Stock Cars) | 2nd | - | - | 18th |
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| 6/4/2021 | Rapid Speedway - Rock Rapids, IA Mark Lloyd Memorial DIRTcar Late Models, DIRTcar Sportsmans, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Darrin Korthals (USRA Stock Cars) | 1st | - | - | 3rd |
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| 6/11/2021 | Rapid Speedway - Rock Rapids, IA $1,500 to win at Rapid Speedway Dirt Late Models: Tri-State Late Models DIRTcar Sportsmans, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Darrin Korthals (USRA Stock Cars) | 5th | - | - | 17th (DNF) |
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| 6/18/2021 | Rapid Speedway - Rock Rapids, IA MSTS at Rapid Speedway with Power Series 360 Sprints - Winged: Midwest Sprint Touring Series with Midwest Power Series DIRTcar Sportsmans, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Darrin Korthals (USRA Stock Cars) | 3rd | - | - | 3rd |
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| 6/25/2021 | Rapid Speedway - Rock Rapids, IA Weekly Racing Series + A-Mod Special (Kids with Cancer Night) DIRTcar Sportsmans, A Modifieds, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Darrin Korthals (USRA Stock Cars) | 6th (DNF) | - | - | DNS |
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| 7/9/2021 | Rapid Speedway - Rock Rapids, IA Weekly Racing Series + 305 Sprints DIRTcar Sportsmans, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars, IMCA RaceSaver Sprint Car | Results | | Darrin Korthals (USRA Stock Cars) | 1st | - | - | 2nd |
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| 7/16/2021 | Rapid Speedway - Rock Rapids, IA B-Mod Special DIRTcar Sportsmans, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Darrin Korthals (USRA Stock Cars) | 2nd | - | - | 8th |
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| 7/23/2021 | Rapid Speedway - Rock Rapids, IA Weekly Racing Series DIRTcar Sportsmans, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Darrin Korthals (USRA Stock Cars) | 3rd | - | - | 2nd |
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| 8/6/2021 | Rapid Speedway - Rock Rapids, IA Dave Mulder Memorial DIRTcar Sportsmans, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Darrin Korthals (USRA Stock Cars) | 2nd | - | - | 3rd |
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| 8/13/2021 | Rapid Speedway - Rock Rapids, IA $1,500 to win at Rapid Speedway Dirt Late Models: Tri-State Late Models DIRTcar Sportsmans, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Darrin Korthals (USRA Stock Cars) | 1st | - | - | 18th (DNF) |
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| 9/17/2021 | Rapid Speedway - Rock Rapids, IA Rapid Speedway Nationals USRA Hobby Stocks, USRA Stock Cars, IMCA RaceSaver Sprint Car | Results | | Darrin Korthals (USRA Stock Cars) | 1st | - | - | 7th |
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| 10/6/2021 | Lucas Oil Speedway - Wheatland, MO Practice Night USRA Stock Cars: USRA Nationals USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Tuners | Results | | Darrin Korthals (USRA Stock Cars) | - | - | - | - |
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| 10/7/2021 | Lucas Oil Speedway - Wheatland, MO 8th Annual Summit USRA Nationals Presented by MyRacePass USRA Stock Cars: USRA Nationals USRA B-Mods, USRA Modifieds, USRA Hobby Stocks | Results | | Darrin Korthals (USRA Stock Cars) | 2nd | - | - | 10th |
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| 10/8/2021 | Lucas Oil Speedway - Wheatland, MO 8th Annual Summit USRA Nationals Presented by MyRacePass USRA Stock Cars: USRA Nationals USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Tuners | Results | | Darrin Korthals (USRA Stock Cars) | 6th | - | 2nd | - |
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| 10/9/2021 | Lucas Oil Speedway - Wheatland, MO 8th Annual Summit USRA Nationals Presented by MyRacePass USRA Stock Cars: USRA Nationals USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Tuners | Results | | Darrin Korthals (USRA Stock Cars) | - | - | 4th | 17th |
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