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| 4/3/2021 | Hamilton County Speedway - Webster City, IA USMTS Spring Challenge A Modifieds: USMTS - United States Modified Touring Series USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Zack Smidt (USRA Hobby Stocks) | 3rd | - | - | 4th |
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| 4/24/2021 | Hamilton County Speedway - Webster City, IA Modified Madness $2,000-to-Win Mods A Modifieds, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zack Smidt (USRA Hobby Stocks) | 2nd | - | - | 1st |
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| 5/15/2021 | Hamilton County Speedway - Webster City, IA Kid's Night + $1,000-to-Win Mods USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zack Smidt (USRA Hobby Stocks) | 3rd | - | - | 2nd |
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| 5/22/2021 | Hamilton County Speedway - Webster City, IA Bob Flaws Memorial + Stock Car Challenge $1,600-to-Win USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zack Smidt (USRA Hobby Stocks) | 1st | - | - | 7th |
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| 6/5/2021 | Hamilton County Speedway - Webster City, IA USMTS $10,000-to-Win A Modifieds: USMTS - United States Modified Touring Series USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zack Smidt (USRA Hobby Stocks) | 2nd | - | - | 1st |
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| 6/12/2021 | Hamilton County Speedway - Webster City, IA Karl Chevrolet Fan Appreciation Night + Kid's Night Dirt Super Late Models, Super Truck, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zack Smidt (USRA Hobby Stocks) | 9th | - | - | 9th |
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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 | | Zack Smidt (USRA Hobby Stocks) | 2nd | - | - | 3rd |
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| 7/2/2021 | Sports Park Raceway - Fort Dodge, IA 4th of July Spectacular USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zack Smidt (USRA Hobby Stocks) | 3rd | - | - | 6th |
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| 7/17/2021 | Hamilton County Speedway - Webster City, IA Casey's Salute The Troops + HCPOA Night Dirt Super Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zack Smidt (USRA Hobby Stocks) | 7th (DNF) | - | - | 15th (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 | | Zack Smidt (USRA Hobby Stocks) | 6th (DNF) | - | - | DNS |
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| 7/21/2021 | Hamilton County Speedway - Webster City, IA Wildcard Wednesday Presented by Peoples Credit Union Dirt Super Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zack Smidt (USRA Hobby Stocks) | 2nd | - | - | 7th |
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| 7/24/2021 | Hamilton County Speedway - Webster City, IA Kids Night At The Fair Presented by Good Life RV Dirt Super Late Models, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Zack Smidt (USRA Hobby Stocks) | 5th | - | - | 11th (DNF) |
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