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| 5/5/2021 | Stuart Speedway - Stuart, IA Bill Davis Memorial 600cc Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact, IMCA Mod Lite | Results | | Bobby Ruehlow (600cc Modifieds) | 4th | - | - | 17th (DNF) |
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| 5/7/2021 | Hancock County Speedway - Britt, IA Midwest Insulation / Central States Agency Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, 600cc Modifieds, Sport Compact | Results | | Bobby Ruehlow (600cc Modifieds) | 2nd | - | - | DNS |
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| 6/16/2021 | Stuart Speedway - Stuart, IA Dynamic Drivelines Dirt Duel 600cc Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Bobby Ruehlow (600cc Modifieds) | 1st | - | - | 6th |
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| 6/17/2021 | Kossuth County Speedway - Algona, IA Outlaw Mini Mod & Weekly IMC Racing B Modifieds, Street Stocks, 600cc Modifieds, Enduro, IMCA Modified, IMCA Hobby Stock, IMCA Sport Compact | Results | | Bobby Ruehlow (600cc Modifieds) | 3rd | - | - | 7th |
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| 6/18/2021 | Marshalltown Speedway - Marshalltown, IA RBF Electric $400.00 to Win IMCA Hobby Stocks Dwarf, Dirt Pro Trucks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, Sportsman Dwarf | Results | | Bobby Ruehlow (Sportsman Dwarf) | 2nd | - | - | 3rd |
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| 6/19/2021 | Boone Speedway - Boone, IA Saturday Night Series Weekly #10 Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | Bobby Ruehlow (Dwarf) | 5th | - | - | 6th |
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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 | | Bobby Ruehlow (600cc Modifieds) | 5th | - | - | 10th |
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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 | | Bobby Ruehlow (600cc Modifieds) | 5th | - | - | DNS |
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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 | | Bobby Ruehlow (600cc Modifieds) | 3rd | - | - | 3rd |
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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 | | Bobby Ruehlow (600cc Modifieds) | 3rd | - | - | 13th (DNF) |
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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 | | Bobby Ruehlow (600cc Modifieds) | 2nd | - | - | 5th |
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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 | | Bobby Ruehlow (600cc Modifieds) | 3rd | - | - | 5th |
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| 10/16/2021 | Mason City Motor Speedway - Mason City, IA Five Star Classic 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Bobby Ruehlow (600cc Modifieds) | 2nd | - | - | 15th (DNF) |
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| 10/17/2021 | Mason City Motor Speedway - Mason City, IA Five Star Classic 600cc Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Bobby Ruehlow (600cc Modifieds) | 5th | - | - | 7th |
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